Affordable Quality for the Timex Computer User

April/May

QUICKSILVA

THOMAS B. WOODS

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SUPPORT FOR THE 2068

HARDWARE

BANK SWITCHING FOR THE TS 1000 Part 2 Expand To 96K - by Paul Hunter

PROGRAM

LJ U LI I — I for your 1000-1500 computer

REVIEWS

iBULk RATE! (US POSTAGE I i PAID 1 i PERMIT#! 51 i

Por tsmdu th Oh i o 45662

BACK ISSUES OF T-S HORIZONS ARE NOW AVAILABLE

Each issue brings you approximately thirty-two pages of usable information, prograiTi listings, product reviews, programming articles, hardware projects, and applications you can use in your home or business. T-S HORIZONS features nationally kncwn writers like Gordon Young and Paul Hunter. And now you can get the back issues you missed for only $1.25 per issue!

Issue HI Creating and Saving Files, Uninterruptible Power Supply, Repeat Key Module, Numerical Analysis, and more!

Issue #2 Memory Reduction, Matrix/Cursor Input, User-Friendliness, Graphics Tutorial, Reset Switch Project, and more!!

Issue H3 Animation, Simple Loading Aid Project, File Protection, Differential Equations, Ham Radio, and more!!!

Issue H4 Bank-Switching for the TSlOOO-Part 1, Error Recovery, TS2068 Edge

Connector Schematics, Converting to T/S BASIC, Simpson's Rule, more!!!

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BANK BWTTCHNQ FOR TIC T8 1000 Ppl 1 Expond To B6K • by Htfipr

Enclosed is Please send issues of T- $1.25 each.

US$ ^

the indicated -S Horizons for

mi

ADDRESS

HI

H2

CITY

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H4

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Send to:

T-S Horizons,

Back Issues, 2002 Summit St., Portsmouth, OH 45662

T‘5 HarKinx

Affordable Quality for the Timex Computer User 2002 SUMMIT ST. PORTSMOUTH. OHIO 45662

Table o-f Contents

FORMAT

SIZE*

IX

2X

Full page

6-1/4 X

9

$125

$119

ENTER

4

2/3 page

4-1/2 X

9

100

95

Guest Ed i tor i al

6

1/2 page

6-1/4 X

4-1/2

75

71

by Stan Ue i t

3 X

9

Reader INPUT

8

1/3 page

4-1/2 X

4-1/2

65

62

Program Tips

11

2 X

9

by Rois Harder

1/4 page

3 X

4-1/2

35

33

Numerical Analysis

12

1/6 page

2 X

4-1/2

29

21

by Ken Lewis

1/9 page

2 X

3

17

16

"WORM" Word Processor

14

2 i nch

2 X

2

12

11

by Gordon Young

1 i nch

1 X

2

6

5

TS 1000 Bank Switching

16

*No charge

■for ad 1

reduct

i on .

by Paul Hunter

FORMAT; Black and

white

only.

Ads

Graphics Program

20

may be reproduced ■

from an ad in

an-

by Johnson and Swartz

other publ i cat i on .

Reviews

21

CLOSING DATES; 15th o-f

month

pre-

T-S NEWS

27

ceedi ng i ssue date

.

USR NEWS

30

FREQUENCY ;

Monthl y

•

Ther^^s something NEU on the horizon.

QUALITY, UTILITY, ACCESSIBILITY, AFFORDABILITY. This the combination you^ve been waiting for. Don^t miss an issue. Subsribe NOU!

I want to have T*S HORIZONS delivered to my hone every month.

I have enclosed $12.00 for a one-year <12 issue) subscription. ^18.00 Canada. $20.00 other foreign.

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City _ _ ' State _ Zip ____

Hail form with check or money order to:

T-S Horizons

Subscription Dept. Please start my

2002 Summit St. subscr i pt i on wi th

Portsmouth, OH 45662 the C __i ssue .

3

Dear Fellow Timex and Sinclair Computer Users,

Thank you -for your patience. T-S Horizons is intended to be monthly but as you can see, you are holding the April/May issue oi T-S Horizons in your hands. Income tax matUrs were only one ot the reasons we are late. At any rate thank you tor bearing with us.

There is a lot ot news concerning the Timex computing world these days - largely bad news, but enough good news that we are encouraged. Ue hope you will be too.

I got some critical comments regarding last issue's cover, and I suppose 1 deserve it. Tm usually an optimist but Timex's lay-down-and-die attitude really upset me. The *2068 tombstone* represented the Timex Computer Corporation only, and not the TS-2068 itself, Timex users in general, or the future of T-S Horizons. Actually I'm optimistic about the last three.

Hope for the TS-2068?

Due to recent ads selling Timex products at 1/2-off and last-minute buying by TS-1000 owners, the stockpile of TS-2068's at Timex is nearly gone. All of the TS-2040 printers have been sold (except for the few being returned by dealers). Some software and TS-2020 program recorders are still available for an unknown period of time. The TS-1000 is out of production. However the TS-1500 is still being made on a limited basis for educational use. (You know, those correspondence schools that advertise in magazines like Popular Hechanics, that offer to teach you how to program and give you a free computer.)

However if you've heard rumors that someone is seeking the rights from Timex to market the TS-2068 and/or TS-1000, they're not just rumors. Our sources at Timex say no less than 20 parties are inquiring about the prospect - some of them seriously. As we understand it Timex will manufacture the 2068 if they can get a firm order for 25,000 units. It will be the same machine, but will not carry the Timex name. (This makes some sense. Timex was perfectly happy with the TS-1000 as long as it was *selling itself.* But when they really had to market it and the 2068, they dropped them.)

So it seems there is some hope for the Timex (?) computers. (Notes Clive Sinclair still has made no reassuring gestures to American users.)

Publishino - Another One Bites the Dust

- In case you haven't heard Sync has sunk.

The March/April issue was the last. When 1 heard the news, 1 called their offices to find out why. Incredibly, the guy 1 talked to said it was because Timex got out the computer business - as if they thought all of us loyal Timex users would say, *Well Timex is gone. Let's all go buy Ataris and cancel our subscriptions to Sync!* When I reminded him that when Sync was first started there was no Timex computer - only the 2X80 - a Sinclair computer importad from England, he said he never thought of it like that. 1 suspect the true reason was a falloff of advertising income due to excessive ad rates.

- Timex Sinclair User is still dead, despite rumors to the contrary. The only hope 1 see is if they get dollar signs in their eyes over Sync's dropped advertisers.

T

HMEX TakM A Liekiac

BAM( 8WITCHNQ FOR nc TS tOOO Fwt 1

Exftnl To MK • by PaU HiMw

S Hiriiinj

MWM* IV M Tlm« CompiMr Unr

Another one bites the dust...

- Bad news for TS User (newsletter) fans. Despite the big talk in the April issue <*If you are a (TS User) reader then you are OK. TS User is full of optimism. TS User will continue production and coverage of Timex and Sinclair Microcomputer products...), in a recent phone conversation, Derek Stubbs informed me that his company was moving on (into robotics and software development - not Timex software), and dropping the Timex market. He had offered in that same issue to establish a clearinghouse for third party merchandise but, of course, that will not materialize now.

So what's left?

T-S Horizons. To be honest 1 hate to see Sync, TSU(mag), and TSU(nl) go. They were all good resources for us at T-S Horizons and other Timex users. But TSH is here to stay. We may be late occasionally but trust us - we plan to be around for a long time.

Some other worthy T-S dedicated publications are:

-SyncWare News, P.O.Box 5177, El Monte, CA 91734 (for the technically inclined - a nice publication). -Basic, 3705 Biscayne B1., Miami FL 33137 (BASIC programs for the ZXBl/TSl 000/1 500).

-Syntax, RD 2, Box 457, Harvard, MA 01451.

-Also see USR News for some very good Timex Sinclair user group newsletters.

In addition there are two other magazines we would like to mention:

-The Computer Trader (1704 Sam Drive, Birmingham, AL 35235). This magazine covers all computers, from Apple to 2X81. In a typical Issue there are four to six articles for the Timex-Sinclalr. Currently they are running an excellent machine code tutorial series.

-The Computer Shopper (P.O.Box F, 407 S. Washington Ave., Titusville FL 3279d). In a recent phone conversation with the magazines' editor, Stan Veit (who provided this issue's Guest Editorial), I was told that they are planning to add two new features for Timex-Sincal Ir users: a general Information-type column and a telecommunications column specifically for Timex users.

Third-Party Support

Although a few companies are getting out of the Timex-Sinclalr market (most notably Memotech), most of the significant software and peripheral companies are hanging in there. The folks at Byte-Back told us, their business has tripled since Timex 'pulled the plug.* 21st Century Electronics has a full line of TSIOOO products, and is developing many TS20d8 products. They have 5

A GUEST EDITORIAL by STAN VEIT of The Computer Shopper

It is almost two years ago since I attended a press lun¬ cheon at the Tavern On The Green in Central Park, New York City. The purpose of the meeting^vas to announce that Timex Corp had formed Timex Computers and would take over the sales of Sinclair Com¬ puters in the United States, Clive Sinclair was there in smiling fellowship with the top brass of the Timex Corp. Their message to' the press was that Timex (who had always manufactured the ZX80 and ZX81 low-cost computers), would now apply their marketing expertise to com¬ puters as well as watches. They would also provide extensive software and peripheral sup¬ port to the Sinclair machines making them highly useful to small business, education, and science.

We members of the press were impressed. Here was a company who’s watches and clocks had a reputation for low-cost and quality and they were going to bring the same qualities to low cost com¬ puters! We believed it as much as the Timex people did.

Timex upgraded the ZX-81, which they called the TS-1000 by adding-additional memory. They advertised the computer and sold thousands of them throughout the country. The Timex TS-1000 became the in¬ troduction to personal com¬ puting for many people.

A few months ago Timex fired all the people left in the Computer division and folded it into the watch operation. Then last week they complete¬ ly got out of the s^es of com- 6 puters, explaining that they

couldn’t make any money from them. Small wonder, the TS-1000 that cost me $99.00 plus $49.00 for the 16K Memory Expansion was now selling for $39.00, with the Memory Unit and some soft¬ ware!

I blame the VIC-20 and TRS-80 Color Computer and the TI 99/4A for the final death of the TS-1000. VIC-20 and CoCo showed the public that you could get a real computer for ^bout the same price as the Timex plus the expansion module. They both had real keyboards and good software. You could get reliable cassette loads, or just plug in a cart¬ ridge and use the machine. There were third party expan¬ sion units that worked. Radio Shack and Commodore even provided a printer and disk drive for those who could pay for them.

Now nobody expects a com¬ pany to stay with a money los¬ ing product, but when you sell millions of items to the public you have some responsibility toward those who bought the product on the basis of your claims about its merit.

Sinclair was not much help to the users of their machines, but they made no bones about it. You understood when you bought a ZX80 or ZX81 that you were pretty much on your own. Timex however promis¬ ed to do better, they offered help from such things as the user hotline (1-800-24TIMEX) and the COMPUTER CLUB and a Newsletter. None of it ever worked. The Hot Line was usually busy and if you got through, the chances were that they couldn’t answer your

questions and they never call¬ ed you back. The other support mechanisms for the 2068 might have worked if Timex hadn’t fired Dan Ross and his staff.

The notice of the complete demise of the Timex Com¬ puters came through a one page P.R, Release from Ruder, Finn & Rotman who do the public relations for Timex. It was dated February 21, 1984 and said that Timex was withdrawing from the home computer business. It quoted Mr. C.M. Jacobi, Vice Presi¬ dent of Marketing and Sales for Timex whP said,’ We believe instability in the market will cause the value of inventories to decline, making it difficult to make a reasonable profit. Further, we are concern^ that those conditions will strain trade relations between manufacturers and retailers, a relationship which the com¬ pany values very highly.’ Note that he says nothing about rela¬ tionships between the com¬ pany and computer users! In regard to service of Timex Computers, Mr. Jacobi said, ’Consequently, the company has decided to withdraw from the retail portion of the home computer busisness. Consumer warranties will be honored and out of warranty service will continue’.

We called Mr. Jacobi to ask him to expand on the com¬ pany’s support policies. We asked questions about the level of support that Timex would continue to offer for software and the sale of proprietary chips and peripherals. We never got to speak with Mr. Jacobi. His spokesperson said

‘We are considering the answers to your questions, we will call you when we have answers for you’. They never called back.

We then called the P.R. firm who said, ‘We can not give you any additional information, call Mr. Jacobi at Timex <

I wish you could see some of the letters we have received from Timex/Sinclair users. They believed in the product and spent a lot of money on it. I myself, taught a course in Timex/Sinclair Programming and purchased a computer for $99, a 16K Memory Expansion for $49, a Printer for $99, a lot of books and software. I have about $400 invested in this machine and I know others who spent a lot more. We never expected a company like Timex to ditch us without any consideration. If they were as concerned for their customers as they are for their dealers, they would still be in the com¬ puter business.

Is the Federal Government going to let them get away with this one? Are Computer Owners as important as Snail Darters? It is one thing for a Company to go Chapter 10 or Chapter 11 (Bankrupt) and end belly-up, its another thing for a solvent company to just dump customers who bought their products in good faith. We are consumers who need protection, the Very Low Cost Computer User is an En¬ dangered Species!

. Don’t write me about it, write your Congressman!

secured the rights to Tintex's word processor for the 20d8, which they say is as good as an/ UP for an/ computer on the market. (2l5t Century, 6813 Polk St., Guttenburg NJ 07093,

210-869-2616). Gesang Associates (P.O.Box 452, Randallstown,

MD 21133, 301-922-0767) also has a full line of TSIOOO and 2068 products.

All of the following companies are expanding their product lines or maintaining status quo (in addition to those who have ads in this issue); 6. Russell Electronics, E-Z Key, Aerco, E. Arthur Brown, Computer-Wear, Paul Hunter, Rorapak. Thomas Woods has been especially vocal about his support for the Timex computer line.

The Future?

There are encouraging signs for Timex-Sinclair users.

-Timex User Groups are as active as ever.

-New companies with new products are still coming out; JRC Software (see T-S News); Hinny Electronics Graphics and 64K

package for the TSIOOO (see last issue)} Interface Design High Speed Interface (see TSH #3).

-Some companies and user groups are trying to 'import* support for the TSIOOO and 2068 from English Sinclair users who weren't subjected to Timex's demise.

Hopefully some good will come of it.

-As 1 stated above the TSIOOO and 2068 may be resurrected in the near future under a new name.

One thing that is important for us to do now is to 'strengthen the things that remain.' Companies that are now supporting TS-related products need to know there are people 'out there* who are hanging on and will buy their products. I think if we all band together we come through this in great shape.

Rick Duncan

50BB

TIMEX

QUICKSILVA THOMAS B. WOODS

? ?

21st CENTURY ^

ELECTRONICS Banta ,

BYTE-BACK Sonw^UtE

- o. misscii E-z

_ ?_ JRC ?

,6,,i,R20 ? SOFTSYIMC

7

Dear Rick,

K E H L-' t H!

INPUT

I would like to clear up a misconception that Art Gindin has about VU-CALC (TS-Horizons #3 Memocalc). I also experienced the same difficulty trying to get a print out on my Seikosha GP-IOOA printer and I also blamed the software.

I believe the letter points out sufficient problems to warrent making future 2068 users aware of.

Mr. Heifner has been a valuable asset to our group in evaluating and reviewing new pro¬ grams for our newsletter. I hope you find his article as valuable as I did.

The truth is that the Memotech interface and Seikosha printer will not accept Sinclair graphics (in this case the black bars that make up the grind in VU-CALG) . Many Sinclair programs will not print on the Seikosha and those that do will print in a 32 column format. (Syber Software makes a cassette program called MEMOSHA which will correct this problem but I have not been able to get it to work and it requires extensive program modifications which I think would be beyond the capability of the type of reader Art is aiming his articles at). VU-CALC should not be "abandoned" however because it will accept text in the grid which Memocalc will not. The problem is not in the documentation. It works fine with the Timex 2040 printer and the ZX-81 printer . I have encountered many people who have run .into this problem and it may be worth mentioning in your magazine. I did hear of one individual who reprogrammed VU-CALC with an acceptable ASCII symbol such as "$" instead of the graphic bars.

I hope you will forward this information to Art and hopefully to your readers. Apparent¬ ly Memotech, Sinclair and Timex are not giving it out.

Very truly yours,

James A. McKnight

3708 Strayhorn

Mesquite, Texas 75150

Gentlemen,

Enclosed please find article on Timex Program 8 VU-CALC for the T/S 2068.

Peter J Callinicos President

MILE HIGH CHAPTER TIMEX USERS

FROM: Mark A. Heifner

37 E. Colorado Ave.

Denver, CO 80210 (303) 744-1137 (303) 722-9067

TO: Timex Computer Corporation

Several weeks ago I purchased a copy of the Vu-Calc for the 2068 and was eager to use it for my business application, having found the Vu-Calc for the TS 1000 very useful, but rather limited. I was immediately impressed by the expanded number of rows and columns, the more creative method of working with data, and especially the almost limitless number of formulae that could be entered - a severe problem with the TSIOOO program. After a few minutes I realized that the program was essentially useless for any serious applications and I had to return it for a refund.

Two aspects in the 2068 Vu-Calc make it difficult to use. One is the lack of sepa¬ ration between the boxes. When all the boxes are filled on a certain portion of the display the only way to distinguish between one box and an adjacent one is to move the cursor around. All the numbers run together, end to end. Although that problem is manage¬ able but a nuisance in comparison to Vu-Calc for the 1000, one other problem cannot be remedied in any way.

In writing the program it apparently was decided that a display of 4 columns instead of 3 was important. Because of the limited space on the 2068 display in normal mode it was necessary to drop the lines separating the boxes and reduce the number of numeric entries in each box to 7 from the 8 as in the 1000 version.

Vu“Calc, like its big brothers and sisters Visicalc and its variations for the larger computers, is most useful for working with dollars and cents. Seven entries, including the decimal point, limits the program to values less than $10,000.00 whereas the 1000 version allows figures up to $100,000.00. I am sure you can see that this limitation makes the program useless for all but the simplest application.

As I see it, the deficiencies of the 1000 program were corrected quite well, but in the process nobody apparently noticed that a new set of problems had been created that pro¬ duced a program which is almost useless. The 2068 is a very capable machine with lots of dandy features and I was both surprised and disappointed that such a trashy program had been allowed to go out on the open market. A few suggestions might be helpful to correct- ing this situation with this program.

A lot of people I know that have the 2068 have gone to using monitors rather than a TV. The picture is so much better on the monitor and good monitors are nearly as cheap as a good black and white TV. Why not produce a Vu-Calc which uses the expanded display modes? If a printout is needed on the 2040 printer I am sure it could be worked out that two consecutive printouts would be sent to the printer with each printout showing half the screen. Alternatively, you might return to a 3 column display with separations or even a 2 column, dual screen display or some variation on that. The Important thing is to maintain many of the features already there but allow at least 8 numeric entries per box. Maybe it could be worked out that the user would even be allowed to select the number of entries per box, up to some reasonable limit ^ and the display would adjust itself accord¬

ingly. I doubt that having more than 9 entries per box would be useful. I do feel that a minimum eight is needed.

In conclusion, spreadsheet programs are so very useful it seems a shame to produce a program for the 2068, a very capable machine, that is essentially useless when compared to the similar program for the 1000.

INVASION OF RUSSIA, JULY, 1941

16K, 32K, or TS2068

You command the German Invasion of Russia to take Moscow.

T/S 2068 Game has:

• Large map of Eastern Europe and U.S.S.R.

• Diyisional and Brigade Strength-Panzer, Infantry, Calvary, etc.

• Supply lines • Zone of Control

• Effects of terrain and weather

• Actual Reinforcements

• No fast reflexes required.

32K-IDENTICAL TO TS/2068, EXCEPT:

• large 4 screen map board • No effects of terrain 16K-IDENTICAI TO 32K GAME, EXCEPT:

1 screen map board T/S 2068 -

00 S « H

32K

16K

- $17.9^V

- 17.95 1+ $2.1

- 14.95/

VISA & Mastercard Accepted

Dealer inquiries welcome

Copyright 1983, 1984

SHARP’S

127 NINE MILE RD. SANDSTON, VA 23150 (804) 737-4895

9

A message from THOMAS B. WOODS

Dear Fellow Timex Computer Owner,

The bad news that Timex has dropped out of the personal computer market comes to me as a Itremendous disappointment. I put my faith in their machines and for the last two years have worked long and hard to build a software business with a reputation that I think is one of the best in the industry.

In the current situation all of us are wondering what will happen next. There is one thing I'll say, however. When the dust settles, I intend to still be here. I am determined to continue providing quality software for both the TSIOOO and the new TS2068.

I owe my business to you who use these two marvelous machines, and you deserve far more than to be simply dropped and forgotten. I for one. Intend to keep my computer running. From me, you can expect to see an optimistic future of more programs and more applications for the Timex.

It is in this rallying spirit that I announce my latest product: PRO/FILE 2068. The original, release date was scheduled for June 1984, but with circumstances being what they are, I feel that this program released now, will demonstrate my dedication to the support of the TS2068.

The manual for PRO/FILE 2068 is not yet complete, but the program itself is finished, extensively tested, and is ready to be shipped with abbreviated operating in¬ structions and a promise that the manual- -expected to be 100 pages — will be mailed to every customer just as soon as it is printed.

Enclosed is a detailed description of PRO/FILE 2068. You'll notice right away that this program is a significant advance over the older but still extremely popular ZX Pro/File used on the TSIOOO and 1500.

PRO/FILE 2068 is a masterpiece if I say so myself!

By pulling together, by communicating, and by sharing ideas and talent, I am convinced that we Timex computerists will emerge from the present chaotic state unscathed, and the computer itself will be as strong and popular

las ever.

FOB JTIST YOU CAN

QRAB THE BOLL EY THK HORIIS

TOCO TECHNOLOQY

•nnounces Stock Market Software for your TIMEX 1000 and TS g066

The TECHNI-ETOCK SOFTWARE SYSTEM la a stock market analysis program designed by a pro trader for use by pros and beginners alike. The program analyzes your favorite stocks using statistical and technical averages In order to predict future stock price trends.

The System Includes:

1 ) HANDSOME BINDER

2) 26 PAGE INFO GUIDE

3) RESEARCHED WORKSHEET

4) REFERENCE SYSTEM

«:) PR0®A>D1ED CASSETTE

To Order: Send us the names of your favorite 6 stocks along with a check for $24.9? for the TIMEX 1000 version (9 stocks and $34.9? -TS 2066) to:

for use 1 6K or more

TCX:0 TECHNOLOGY $3

POBOXBB shipping

SAN1 A CLAUS. IN 47S7»

As always, GOOD COMPUTING!

Thomas B. Woods

P.O.Box 64, Jefferson, NH 03583

ZX PRO/FILE

A machine language information storage and retrieval tool for 16-64K.

* Multi-word search capability A Instant file access

* Ordered displays

* Definable printer functions

* Totally flexible file size

* 59 page tutorial manual

* Newsletter updates

THE MOST ADVANCED FiLE MANAGER YOU CAN GET FOR THE TIMEX

Ask for free specifications or send $16.95 for cassette and manual to:

THOMAS B. WOODS

P.O. Box 64, Jefferson, NH 03583 Phone: (603) 586-7734

Vi<ui Mastercard welcome

10

^^^AstfFreeTSIOOO

orTSZOBB

.j?** ^*®^j**9

i??i/aa@8®8!i‘.iaesi4 with catalog

FREF MC i)rog(<»ni UsItriQ and raiai'oq wiin S A S F. I'JOc onsl i

Ron LeMon, 1601 W 400 S. #86, Sail Lake City. UT 84104

TIMEX-SINCLAIR programs to save you money. I Payoff shows how much credit card and charge accounts really cost, how to pay them off and save $$$. Payout shows where your hard-earned money is going. On cassette, $12.95 each post¬ paid. Specify TS-1000 w/16K, TS-1500 or TS- 2068. Ace Software, 2 East Oak Avenue, Moorestown, NJ 08057

GOLFERS

GOLF HANDICAPPER is a menu driven 16K BASIC program for your TS 1000, 1500, ZX81 which computes/saves/ updates USGA handicaps for up to 48 players. With a printer attached you can print out scores and handicaps for all players. High quality cassette tape shipped in hard box and accompanied by full documentation. Send $20 ck/mo to John Carson 11200 Lockwood Dr. #307 Silver Spring, MD 20901

*****MICR0-L0AD*****

HAS

UNUSUAL SOFTWARE FOR TS1000/ZX81 BOX 1095, T OR C, NM 87901

Send. BASE for information.

CLASSIFIED AD

PR06IWIS for SCIENCE/HEALTH/ MATH/ELECTRONI CS/HOME . Free

catalog tor SASE and 40 cents postage. MAH Software, 341 West Eagle Lake Drive, Maple Grove, m 55369. 1 1

NUHERICfiL QNhLYSIS

LEAST SQUARES METHOD OF CURVE-FITTING POINT DATA TO

y=ax+b or y=be by Ken lewi s

The standard approach to fittinf^ a

set of data points to a line y=ax+b

is to use the method of least

squares. The least squares method

provides an unambiguous fitting

procedure which minimizes the

deviation of the data points frcxn

the fitted line in the following

sense. Let Y. represent an

experimental value and let be a

value from the equation y=ax^+b,

where xj is a particular value of

the variable which is assumed to be

free of error. It is desired to

obtain the "best" values of a and b

such that for e. = Y . -y . =Y . -ax . -b , 1 1^11 1 ’

N 2 N 2

the error E= 5 eT= ;jg(Y.-ax.-b)'^ is

i 1 j 1 1

a minimum, where N is the number of data points. Since xi and Yj[ are unaffected by the choices of a and b, the minimizing relations are dE/da=0 and dE/db=0. These result in the two equations:

both sides to get In y=ln bt-ax, and define y^=ln y and b^=ln b. Now we have y'=ax+b’ , so the method outlined above applies.

THE PROGRAM

To execute, this program, enter the "RUN" mode. The first prompt is "INPUT PAIRS OF DATA" and "ENTER POINT 1". The point is entered as follows: x^, enter, y^, enter. The new prompt is "ENTER POINT 2" and

the answer then appears with a and b expressed numerically.

EXAMPLE

Fit a straight line to the given data using the least-squares criterion .

X

1.1

2.9

4.3

6.2

f(x)

50

43

28

25 .

a Sx?+b Sx.= Sx.Y ]_ 1 11

a 2 Xj. + bN = S Y^

Solving for a and b, these values can be expressed in terms of the input data only:

After entering the "RUN" mode, we iirmedtately get the prompt "INPUT N-NO. OF DATA". Since there are 4 points, enter the number 4. In response to the prompt "ENTER POINT 1", the values 1.1 and 50 are entered . We are then

a=

Sx.Y^

SY^ 5 N

— b=

SXi SY.

_ 2

SXi sx.

SN

S Xi2 S Xi

S Xi E N

This is the least-squares method. The approach can be appl^^ to fit data to the curve y=be‘^ in the following manner: take the log of

proipted;' TINIER POINT 2", and the values 2.9 and 43 are input, and so on. The answer is printed out, i.e. ,

"THELINE WHICH FITS THE DATA IS:

Y=5.3011G18*x + 55.716711 "

lO REM L5T5QC'

REM i_ER;5T SOURRE FIT TO 30 REM R LINE FOR N E^RTR >.'3 DIM Xi 100:1 36 DIM F ( 100 :i

4-0 PRINT "INPUT N-ND. HF OCTC” 50 INPUT N 55 CL 5

60 PRINT "INPUT PflTP;=. HF naTO-

10 REM L5T50X

b-95'r "SOURRE FIT TO 30 R^M B*c/.P i:fl^x:i FOP N DIM Xi:i00i ”

36 DIM F I 100 -I

TmI-? N-NO. of Di:

INPUT N 55 ULS

P0 PRINT "INPUT DaTD<^ ,-,cr r.,-

70

FOR K=1 TO N

70

FOR

K=1 TO

75

INPUT .>:. 1 K '1

I NR

JT >: 1 K 1

60

INPUT FiKi

U0

I NR

UT F ( K 1

50

100

NEXT K

LET SUMi=0

62

SF

CLS

LET

F iK) =LN

110

LET SUM2=0

50

HEX

T K

120

LET 5UM3=0

100

LET

SUM 1=0

130

LET SUM4.=0

110

LET

SUM 2 =0

14-0

FOP. L=1 TO N

120

LET

150

LET SUMl =SUM1+X IL)

130

i-ET

SUM 4=0

160

LET SUM2=SUM2 + X' (L'! *>:' I'L'!

14-0

FOR

L = i TO

170

LET SUM:3=5UM:3 + F iL'i

l50

LET

SUM! =Fi 1

160

LET 5UM4.=5UM4- + X 'L' +F n't

160

LET

SUM2 = 5U

150

Nt:XT L

170

LET

5UM3=5U

200

LET D = 1 •' f N*5UM2-:5.UMl-^;=ii iMii

160

LET

Si iMm. =:=,.■ 1

2X0

LET A0= i 5UM2*5UM3-SUMl-»-:=iUM4

150

NEX

r L

*D

220

LET PI = I -5UM1-»5UM3 + N*5UM4.:! *

2 00 210

LET

LET

D = 1 y H * A0= iSUh

5 PRINT "THE LINE UHICH F DRTR 15:"

? PRINT "■

5 PRINT "Y= ";R1 ;“•»>; + " :

) STOP

230 PRINT HE DRTR IS 2^0 PRINT £ w’ 0 P‘ K X N"^

’ ; H X ■ ‘ X

260 STOP

Cl D=l/ (N^SUfiS-SUf-li-^^a !H- ET R0= ! SUM2'»5UM3-SUMl-^:5i.

P'i' Hi= -SUM1*5UM3+N*5UMj

PINT "THE EXP WHICH FiTi

; EXP ( R0 ) ; " *E')

PROGRAM

EDUCATION

• NEW FOR TIMEX/SINCLAIR 10(X)/ZX81 16K.

Dual Purpose Academic Programs

• Challenging. Self-Pacing ... Tailored to Specific Interests and Abilities.

• Software Written In Basic ... Easily Understood ... Not a Bit of Machine Code.

Full Documentation Package

□ RISING SUN . $14«

Tour Japan, facts, geography (12-Adult)

□ LONG DIVISION TUTORIAL. .$12“

A dedicated tutor ... not flash cards (8-10)

□ AREAS OF CONCERN . $13“

Areas, perimeters, discovery, fun (10-13)

□ THANKS MR. NEWTON .... $13“

Laws of motion, serious graphics (16-Adult)

□ VINS FRANCAIS . $14“

French wine guide (Adult)

(CT residents add 7.5% sates tax; Outside USA add 15%)

~~| I All software on high quality

t cassettes and is replacement

- - guaranteed.

— - To order, send check or

V _ money order to:

— C _ tag software

I I \WJI \ P.O. BOX 688

RADIO SHACK COMPUTERS

AX DISCOUMX PRICES

» FULL RADIO SHACK UARRANTY

* PURE RADIO SHACK EQUIPHENT •MAIL ORDER DISCOUNT PRICES

* FREE SOFTWARE WITH EACH COMPUTER SOLD » FREE BOOK 'HOW TO GET RICH WITH YOUR

MICROCflHPUrER* WITH EACH COMPUTER SOLO

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• FULL LINE OF PROOUaS

pBOEMMai

NAUGATUCK, CT 06770

TIMEX/SINCLAIR 1000/ZX81 TRADEMARK TIMEX SINCLAIR

Do you need a word processor that will work on any printer with the interface you have? Would you like to write your text in 30, 40 or whatever column width you want? I know I did! MEMOTEXT requires the MEMOTECH inter¬ face, WORDSINC II only prints on the Timex printer and the others (those with names I forgot after finding out they did not work very well), fell short of working on the machine code, I came up with a usable pro¬ gram, which I have called "WORM", for lack of a better name. This program has:

**Left/Right justification **User defined column width **6,000 character text file **Dual mode operation **Global editing (insert/delete)

**Character counter

**Upper/Lower case (for full size printers) **Machine code fast typing **Wrap around screen operation **And more

The nice thing about this is that, you can do all the programming for it by reading this and 2 more issues of this magazine.

If you have never worked with machine code and are afraid to tackle this, don't be. Just follow directions closely. This month I will provide you with the first steps. Once we get the machine code entered, the rest will be much easier. There is over 2K of machine code that is entered into 4 REM lines. I will provide you with an assembler to enter the codes and a listing of the codes in each line. In addition, a checksum can be -j/j, used to test your entries for assurance. We

will make your 16K TS-1000 computer a very usable word processor.

Begin by turning on the computer and putting it in the FAST mode. Now make line 1 just like that in figure 1. After typing all of this in, press ENTER. It must be exactly like the figure shown! When this has been done, create line 2 with exactly the same REM statement as in figure 1. Do this by using the EDIT command, then press DELETE, which will erase the line number "1". Then press 2. Repeat this procedure to create lines 3 and 4, with the same REM statement.

At this time, SAVE everything onto tape! DO NOT attempt to edit these lines again.

0

FIGURE #1

FIGURE #2

Now, enter the BASIC assembler of figure 2. This will be used to enter the codes. When entering codes for line 2, 3 and 4, you will have to change the address in line 9977 (more on that later). You should now have four REM lines and the assembler starting at address 9977. Again, SAVE everything onto tape (use the other side of the tape just as a precaution).

When using the assembler, you will be entering the codes as listed in figure 3. In using the assembler, you simply enter a code (press ENTER) and continue until you reach the end of the listing. The machine code list has 6 codes across and are to be entered left to right, top to bottom. You can make a correction by pressing 333. This will backspace and correct a wrong entry. You might want to stop and SAVE your entries along the way and to do this, just get the recorder ready and press 555. When all the codes have been entered, enter 999 to stop.

Now you should have line 1 finished and can check your entries by a simple checksum routine that adds each number in the line to produce a sum of all your entries. Do this by entering:

If you RUN the program at line 3000 you should get the sum: 58243

If this is the answer you got, then so far, line 1 is complete! If not, you need a program that will PEEK each address between 16514 and 17154 to check your entries. I have found that some of my readers will accidently make a wrong entry and not get the checksum number correct. If this is your case, add these lines:

This will help locate an error. You will still need to determine the address and make the correction.

Next month I will, give you the codes for line 2 and 3. I can't over emphasize the importance of your machine code entries. A wrong entry could crash the program or worse, write a hundred wrong entries over others, so be careful! You should have no problems, but if you do, write me and I will help you out. More in the next issue!

Gordon Young P.O.Box 2411 Vista, CA 92083

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BANK SWITCHING FOR THE TS 1000 - PART 2 By; Paul Hunter

The second part of this series will describe some of the hardware so that construction work can progress while the software is developed and tested.

It seemed probable from the outset that more and more peripherals would be added to the system as time passed so the first task was to build an expansion interface to buffer the TIMEX/SINCLAIR signals. Such expansion boards have been described in the past and this one is not much different.

EXPANSION BOARD

The interface described here uses a "COMPUTER CONTINUUM" board (since I had one) but the circuit can equally well be put together on perforated project board with wire wrap or point-to-point wiring. The "COMPUTER CONTINUUM" board is very well made, costs $35, and makes life a lot easier. The board comes with provision for memory-mapped I/O in the 8 to 16K region and as a result the decoding suggested is quite complicated. Without much loss of versatility, the four ICs used in the decoding were replaced by one-half of a 74LS02 quad NOR gate (see Figure 4) -- partly because I did not have the 7425 required. The only restriction caused by this modification is to disallow use of internal RAM -- it is disabled by ty ing RAMCS high.

The buffer ICs used on the board are a 74LS245; three 81LS95; and one 74LS365 (or 367). If you put together your own interface you might prefer to use a combination of one 74LS245 (for data) and three 74LS244 (for address and control). Such an interface has been described by JOHN OLIGER in the WINTER and SPRING issues of SQ. If you wish to modify a "GOMPUTER CONTINUUM" board for this

interface, the instructions are summarized in Figures 2, 3, and 4. The interface is described in Figure 1. Note that the signal BUSEN is the interface buffer enable (ACTIVE LOW).

After building the interface, test it by plugging it into the computer with a periph¬ eral RAM pack. Test the use of the 8 - 16K space if you have a device that uses that area. The "COMPUTER CONTINUUM" board can be inserted into the rear expansion socket of a ZX81/TS1000 just like any other peripheral. Alternatively, the ZX81/TS1000 board can be removed from its case and plugged in verti¬ cally -- this is useful when an external keyboard has been, or will be, added.

MEMORY INTERFACE

The next step in the project, the memory interface, was built on a RADIO-SHACK project board 276-152A using wire-wrap techniques. This board has a male 22/44 0.156" edge connector which matches the sockets on the expansion board. The female connector to match is readily available at RADIO-SHACK and elsewhere. The wire-wrap connections used allow easy modification and later expansion (and also easy correction of design errors). The position of the memory interface in the scheme of things is shown in Figure 5 and the schematic for the part constructed this month is illustrated in Figure 6.

Operation of the circuit is as follows; The device is mapped in I/O space to avoid any conflict with memory. The 74LS30 generates a negative-going pulse when A0,A1,A2,A5, and A6 are high and I/ORQ, WR, and A7 are low. This pulse is inverted and used as the clock-pulse for the 74LS74 D-type flip-flop. On receipt of the clock-pulse the flip-flop latches the data on A3 and A4. The LEDs provide confir¬ mation. Note that no data lines are used in the device -- this uses up more of the I/O space but is economical in hardware. The clear inputs to the 74LS74 are automatically

ftooAf

brought low on power-up or upon loss of Figure 2 Modifications to the COMPUTER power. CONTINUUM expansion board

After building this part of the interface try the following test. Plug the board into your expansion interface (or with a suitable socket ^directly into your computer) and power up. Neither LED should be lit at this point. Since the SINCLAIR BASIC has no IN Or OUT commands, the routine to service this port must be written in machine code. Enter the program:

10 REM 123 20 INPUT A 30 POKE 16515, A 40 RAND USR 16514

Then poke in the machine code:

POKE 16514,211 POKE 16516,201

Now the program can be RUN. When prompted, enter the address 111 -- the first LED should light. RUN the program again and enter 119 -- the first LED should go out and the second one should come on. The address 103 will clear the latch and the address 127 will light both LEDs. The outputs of the 74LS74 will be used to switch between memory banks.

In next months installment the memory bank will be described, the memory interface will be completed, and if there is room, some more software will be discussed.

ii

4

1. Omit sockets ICl, IC2, IC4, and IC9

2. Jumper together:

on socket 7 pins 13 and 14 (NMI)

pins 15 and 16 (INT)

on socket 8 pins 6 and 7 (ROMCS)

pins 9 and 10 (WAIT)

pins 11 and 12 (BUSAK)

3. Disengage the IC pins from these jumpered sockets

4. Replace diode D1 with a wire jumper

5. Add the small piggy back pc board illus¬ trated in Figure 3 over the space normal¬ ly occupied by ICl, IC2, IC4 and IC9. Signals to this pc board are derived as follows :

BUSEN pin 2 of IC9 (grounded by jumper) ^MCS pin 6 of ICl

RD pin 5 of IC9

DIR pin 8 of IC9 high for read by

CPU low for write

GND pin 7 of IC2

+5V pin 14 of IC2

6. Insert a 74LS02 into the piggy back board

7. Note that both J1 and J2 on the expansion board are inserted to supply +5V and +9V to the expansion *

O

74LS02.

Figure 4

Pigecr{OKj pin 1 o\ 74L245

(4^14-. BEAo By cpo

U>w I wetTfi ey tf*o

18

LIT YOUR

TIMEX COMPUTER

WORK FOR YOU

PEfSONAL • BUSICSS • OmTlONAL PROGRAMS: On cassctt* • menu driven • printar optionai Availabie tor TS 100(V1 500/2000 Seriee

MAIUNQ U8T*16K: Holds 100 names, ad¬ dresses and phone numbers • Searttm -Soria • Lists - Changes - Deletes - Prints . . . 9.98

MAIUNQ UST-MK: Does same as 16K only holds 425 names, etc. . . 9.9S

MAIUNQ U8T-2068: For the TS 2058. Same as 16K, holds up to 300 names, etc. . . 9.9S

INVENTORY-1 6K: Holds 150 items with com¬ ments (Serial Noe., etc.) Searches - Lists - Changes • Deletes • Prints . 9.95

INVOITORY-54K: Sams as 16K orriy holds 750 Kerns with comments . 9.95

INVENTORY-2068: For the TS 2068. Same as 16K only holds up to 600 items . . . 9.98

CHECKINO-18K: Lists 25 deposits - 80 checks - Adds interest - Deducts Serv. Charges - Searches by #, name, date or arrwunt - Prints list of deposits, acct. & checks.

. 9.95

CHECIC1NO-64K: Same as 16K only lists 100 deposts - 500 checks . 9.95

CHECKINO-2068: For the TS 2068. Same as 16K only lists up to 100 deposits arrd 350 chocks . 9.95

GRAOEBOOK: Teacher's time saver • Sell¬ adjusting memory - Computes mearrs, stand¬ ard deviations, variance and coefficient of vari¬ ation - Ranks by weighted or unweighted av¬ erage . 9.95

FINANCIAL RECORD KEEPER-16K: Holds 20 files for household or small busmess ex¬ penses arxj/or irxxxne • Reviews, corrects or charrges information - Prints list for tax pur¬ poses . 14.98

FINANCIAL RECORD KEEPER PLUS-48K: Does same as 16K - also keeps up to 500 checking transactions - Reconciles checkbook with bank statement . 19.98

FINANaAL RECORD KEEPER PLUS-2068: For the TS 2068. Same as above with 350

checking transactions . 19,95

SALES FILE-1 6K: Retail business program can be used directly as a cash register to keep records for bookkeeping and inventory. Holds ISO Hems & 25 accounts • Prinia accounts, Inventory & receipts . 14.98

SALES FILE-64K: Same as 16K only holds 600 Kerns & 100 accounts . 14.98

SALES FILE-2068: For the TS 2068. Same as 64K . 14.95

INVOICE CONTROL: Keeps track of, and prints, invoices for the smalt business. Self¬ adjusts according to amount of memory avail¬ able . 14.95

APPOINTMENT CALENDAR-1 6K: Enler date and list up to (8) appointments per day for up to (31) days - Change - Delete • PrirK - Save on tape . 9.95

APPOINTMENT CALENOAR-2068: Same as above . 9.95

SEND FOR FREE CATALOG Any three $9.95 tapes for $24.95 - Add $1.00 per tape shipping - Ind. res. add 5% sales tax - Sand Cert. Check, M.O., VISA or M/Card No. w/Exp. Date.

HEATH COMPUTER SERVICES 950 E. - 52 S., Greentown, IN 46936 Phone: (317) 628-3130

A Text and Graphics Program

by Harry Johnson III and Gary Swartz *

This program not only lets you create graphic drawings, using the directional arrow keys to plot out a picture, it also allows you to input text into the drawing. To insert text, position the cursor at the desired location using the arrow keys <5-8), press "P", type in the desired words or characters, and press ENTER. This causes the text to printed starting at the cursor location. You are then returned to the plotting. Instructions are included in the program.

X -i- ( i hND iNKc-Y $ = “' S ” j

Y’+(i hND INKEYa = ‘’7") Y $ = ” 5 ‘ ' ]i

3 THEN LET ¥=4-3

CU 1:11 1:1.1 i; i.l Cl.! i; i.l f'lj ( t.l

REVIEWS

BOOK SeOiEU by Ed Sinipson

(Publisher of Hwite Business News)

HOW TO h^RKET TOUR T] HEX/ SINCLAIR SOFTWARE by R.A.Fauro Sof bar k Assoc .

210 Fifth Ave.

New York H1 lOOlO 52 pages, 8xll $12.95

market plan, software security, sofbare publishers, mail order selling, magazine aduertising, direct mail marketing, and other opportunities. These sections are 3 to 10 pages long and are sometimes further divided into smaller subsections, Of particular value are the chapters about developing a market plan, mail order selling, and direct mail marketing. The last chapter -covers everything missed in the other sections and even includes tips on how to get free publicity.

This hook provides a complete overview of hoi/i to market the Timex/Sinclalr software that you have written. Many sources of further information are included in each section. This manual covers all the information that a potential software freelancer needs and is written in an easy to understand wel 1 organized style.

This book is divided into the following sections: Defining and developing your product, developing a

This book covers everything you need frc<Ti product pricing and packaging, to marketing methods. It is an excellent starting point for the freelancer and will greatly enhance you^- chance of successfully marketing your software. 1 like the books style and content but only wish the author would have lengthened some sections. Overall this book is an excellent value for the Tirsex/Sinclair freelance programmer (and can help any beginning software marketer).

ANALYSIS

16K RAM, 8K ROM TS-1000/ZX-81/TS-1500/

TS-2068. Stock selection guidance.

Fundamental stock analysis. One-time input using data in newspapers or library. Make sound BUY/HOLD/SELL decisions. Uses Linear Regression techniques to forecast expected earnings and corresponding market price data.

Send $17.99 plus $1. postage and handling for each tape and tutorial ordered.

PORTFOLIO

16K RAM. 8K ROM TS-1000/ZX-81/TS-1500/

TS-2068. Investment portfolio file management. Maintain records of shares, cost, performance and selling-price- targets of up to 50 stocks, bonds, mutual funds. Menu driven. List file, records; record maintenance or file update options. Save data across pro¬ gram SAVES/LOADS. Input current market prices & program recalculates overall portfolio and individual security performance as well.

Send $15.99 plus $1. postage and handling for each tape and tutorial ordered.

ORION'S BELT ENTERPRISES 807 N. Fairway Rd., Glenside, PA 19038'

(PA RESIDENTS add 6% sales tax)

Please specify computer model .

" ' — - . -'Ml... II , ,.W

COMPUTERS

TRADER MAGAZINE

ir ^ ^LIMITED TIME OFFER ^ ^ ^ BAKER’S DOZEN SPECIAL!

$12.00 for 13 issues

Regular Subscription $15.00 Year Foreign Subscription: $55.00 (air mail)

$35.00 (surface)

Articles on MOST Home Computers, HAM Radio, hardware & software reviews, programs, computer languages and construc¬ tion, plus much more!!!

Classified Ads for Computer & Ham Radio Equipment

FREE CLASSIFIED ADS

for subscribers

Excellent Display and Classified Ad Rates Full National Coverage

CHET LAMBERT, W4WDR

1704 Sam Drive • Birmingham, AL 35235 (205) 854-0271 SampjeCopy $2.50

SOFTWARE REVIEWS by

Tex Fau.c^'tte-

••SCREEN-CRLC" CoPyriSht 1982 by Bant* SoftWAr*^ 8088 HiQhwood Wjiy> 0r*Ti9»viiU> Cfl 95662

SCREEN-CRLC 1ft a TftAl cutt •Iftctronic ftPrftftdfthftftt with a number of interefttin® feAtureft, The documentAtlon contftinft 23 PeQeft Pluft An Index. Rbout 8 PA9eft consist of a "tAmPle Problem" which/ when followed ftteP by step by the first time user/ will serve as a very 9ood demonstrAtlon of the Pro9rAms PotentiAl.

stAtements Arc limited to 80 chArACters (keystrokes)/ An intermedlAte result msy be stored in An unused cell to be oPerAted on by a second function statement to complete the more complex oPerAtlons. These celled function statements may use the majority of 1- stroke functions such as EXP/ RND/ TRN/ SIN/ COS/ SQR/ RBS/ etc.

SCREEN-CRLC has sufficient menus and sub menus to rate as "User Friendly"/ at least for one experienced in the use of spreadsheets. The novice in this area would benefit from a more extensive tutorial than that suPPlied in the documentation. I did manA9e to achieve a few accidental "breaks" while u£in9 the Pro9rAm/ but was able to recover and return to the Pro9ram without losin9 data. Printout is done with use of the COPY statement/ and those with wide Printers and Pra9rammin9 ability mi9ht want to query Santa concern in9 Possible modifications to take Advanta9e of their individual hardware caP abilities.

The Pro9ram will hold uP to 1008 "cells" with a minimum of ten elements in each direction. Three columns and six rows are displayed at a time/ with the center (active) column and row displayed in a removable box. Display way be shifted one Position in any direction with cursor keys/ three Positions with shifted cursors/ or a ;^’JumP" can be called to any Position by jlPecific column and row number. The kser can desi9n a sheet of any size jiwithin the 1008 cell limit). Banta Recommends a Preliminary desi9n be laid put with Pencil and Paper/ as the '<Jefti9n is entered as (columns) x jCrows)/ i.e./ 10X20/ and the 2068 does ihe rest. Data SRVED can be re- loaded on a new sheet of the same dimensions.

r

1 have a stron9 suspicion that this pro9ram was ori9inally written for the §Pectrum. 1 base this on the fact that the instructions for insert in9 text (^ention that the Shift 8 must be used for insert in9 sPaces/ and that attempts to use the space key will result in a ? break". This is not true for the 2068 in my experience. If it should happen., a GO TO 1200 is supposed to recover. The instructions also contain reference to " IF. . .THEN. . .ELSE command"/ which may confuse some 2068 users! Not to worry/ specific instructions for this command follow/ and an example is 9iven later on in the manual.

In sPite of these minor deficiencies/ the documentation seems to be adequate. Once one has become familiar with the Pro9ram and entered some data to work on/ numerous manipulations of the data may be Performed. While called function

"SCREEN FILE" CoPyri9ht by Software/ 808B HiShwood 0ran9evale/ CR 95662

Banta

Way/

SCREEN FILE is B#si8ned to run on any Sinclair ZK-81 Oh Timex Sinclair with 16K RRM. The casette comes with 5 Pa9es of documentation which Includes a l-l/'2 Pa9e "sample Operation". Pro9ram is recorded once on both sides of the casette.

SCREEN FILE features simple menu options and screen Prompts and could be used for a variety of applications ran9in9 from a simple name/ address/ Phone number file to a file containln9 uP to 6 additional lines of data foUowlno the Prt-dimtnsloned name/ address/ etc. blocks. Files may be searched by name/ number/ or element of * *»*'-ch line"/ and may be modified/ saved and Printed. Re- load I n9 time for a file contalnln9 data is dependent on the amount of data stored/ which may be in excess of 17/800 characters.

While SCREEN FILE Showed an excellent response to keyboard input/ there are a few features I was not haPPy with. When a file WAS Printed (evidently with the COPY command) the menu selections are Printed as the first line. This could be trimmed off with knife or scissors/ but who wants to bother?. l also manaOed to achieve a "keyboard lock" while attemPtln9 to "nODIFY" a file and was unable to recover from that condition without total loss of data.

Conclusion- SCREEN FILE needs a bit of modification.

\

devoted

"GRIDLOCK

SOFTWARE,.

92014

The "GRIDLOCK" ©amee for T i meX'^S i ric I a i r

casette coTitains the umexPand computers.

-hTcT a missir)9

*niF ba entering coordinates on a 15 x 20 9rid. "Robot" lets you repack cartons,. aQain by entry of coordinates in a from "to" sequence. "Easy Plot" IS a simple Pro9ram to display the Plot of equations for Y as a function of X.

The carton which contains the cassette indicates the Program is for a9es 10 UP I believe that 2-BIT SOFTWARE is 9uilty ° . L ■ underestimation of th*'

soPhistip,tion of todays kids,, and would not hesitate to turn these Programs over ^o kids from grades "K" on uP ,. with a bare minimum of instructions!

BOOK REVIEW bs Tex F,uc»tt.

BASIC

lies sybeJ '*■

o Iric./2344 S:

Bwrkeley^ Cfl 94710.

PROGRAMS IN ■t, Copyright xth Street,

The author, Stanley p

boor'^Jf iFArojch'ln hf!

o? H. Provides » serlM

b«lS Of ^ISsiC ’’''‘’*7"“ the wist

ceeirel°%K;ib«'‘

combi ^ i”” Which may be

with the expanded TTskT^Tx’s [000^ programming knowledge is required! ‘

featuring calm laf <«•-,« ©..^tate.

Payments, monthly

-pTir e-iii",

contains simPle data anal 5

our g?iSr^, had to expand

e ♦f’e '■ight keyboard,

IS? cop“‘' "O* '» top'' ‘t up ,0 you, TS1000/

‘ ■‘"’'"0 Stieod Fuodons (like

1 * ^ Schematic of the computer

3.C.,., p,.„,o

compiden, you eXSu^^’'"’'”' iT-XSltpUi

W.M. - Camden, SC

. . looks great, you’ve got a fantastic product there,”

_ _ _ _ _ R. j. - Cypress, CA

MULE Electronics - Dept.aiop

Lincoln Blvd, 51195 *

Venice, CA 00231 * *

For 16K TSIOOO, 1500 & ZX8f

20 PROGRAMS

ON 2 CASSETTE TAPES

for the amazingly low price of not $39.95...not $29.95...0NLY $19.95

(TS2068 version only $29.95)

Save money, learn about the exciting world of home comput¬ ing and have fun doing it with the new HOME-PAC™ from SIMPLEX SOFTWARE.

COMPUTER LITERACY

Designed with the beginning computer user in mind, the HOME-PAC covers more application areas than any other software package available. Discover and explore educational, recreational, home-finance, graphics & utility applications. The HOME-PAC includes such exciting programs as star invader, biorhythms, checkbook balancer, statistics, Comp-u- sketch, animals, micro-organ (music), machine language monitor and many (12) others. Also included is a well written easy-to-follow user manual that takes you step-by-step through each of the 20 challenging programs.

HIGH QUALITY

The programs are well written and user friendly. The 2 cassette tapes are high in quality and unconditionally guaran¬ teed for 1 year to load & run. The 21 page user manual is in a class by itself, and the packaging includes free Norelco type hard storage cases.

MONEY BACK GUARANTEE We are so confident that the HOME-PAC represents the most outstanding value in home computer software available, that we are offering an unheard of 10 day no-risk money back guarantee.

10 DAY NO-RISK GUARANTEE If not completely satisfied, return in original condition for a prompt refiind.

Order today, offer good for limited time only!

SIMPLEX SOFTWARE

Dept. B2, 220 N. Centre St., Merchantville, N.J. 08109

Please rush my order for the HOME-PAC, with 10 day no risk guarantee, at $19.95 ($29.95 for TS2068 version) each plus $2.00 postage & handling. Outside USA Add $2.00 per order.

Q Payment Enclosed $ _ Residents of N.J.

Add 6% Sales Tax.

Charge My Q Mastercard O Visa

Card No. _ Exp. Date _

Signature -

Name _

Address _

City _ State _ Zip

□ Send me a FREE brochure.

I^RDUARE REVIEW by P. Donnelly

ITEM: DK TRONICS KEYBOARD

FROM; DK TRONICS, SUFFERN, WALDEN, ENGLAND

(799-26350)

PRICE; 172.00 ♦ S4H (Depends on exchange rate)

About a month after ray second order (the first bounced because of some problems with VISA), I received ray DK‘'Tronics "big* keyboard for ray TS/1000.

The keyboard case is made of a soft black plastic and has 40 grey keys and an additional 12 red keypad keys. The feel of the keys is good and clear vinyl markers on each key contain the standard Sinclair codes, as used in the U.K. (e.g., NEWLINE for BfTER). Inside the case is DK^s "motherboard* which is simply an extension of the 2X81 buss to the rear of the case, but which has an extra male connector sticking up. This leaves the newly exposed rear connector available for other devices. DK also provides enough room for a small internal power supply for graphics ROM assembly. The standard phone plug connectors are exposed through a slot in the back of the case.

Assembling the DK^Tronics keyboard was easy for the most part. Standard installation requires only that the DK keyboard and 2X81 have the screws holding them together removed and the 2X81 P.C. board placed inside the keyboard case. The 2X board plugs in to the motherboard via the edge connector. Two specially prepared connectors then simply plug into the keyboard slots. There is one problem with the standard instalation however. The OK product is intended for use with a

UHF modulator. These cone out of the case about 1 1/2" further from the back than the USA's VHF output and and extra 1/2* hole has to be drilled in the case. This is not a problem, as the material is very soft and easier to work than wood.

The workmanship on the board I received was not very good. I had to realign the motherboard and found some of the wooden mounting flocks somewhat off center, as well. Also, DK made no provision for the Ch2 -Ch3 switch in the bottom of the case. Finally, an obvious mold flaw mars the finish on top of my unit.

DEALER INQUIRIES INVITED

other shortcomings include the lack oi a space bar, the use oi a wooden bottom plate and the total lack ot sheilding (not required in the UK, Td guess). These shortcomings are oHset somemhat i)y the Tine “Teel" of the keyboard, the ease with which the plastic material can be worked, the reasonable price and the extra numeric keyboard. On balance, I would rate the DK's keyboard a reasonable value for the money, but recommend you be prepared to use simple hand tools (screwdriver, hand brace, pliers) to 'finish* your keyboard. I expect a warranty claim would be tough to follow up. Do ask for the Overseas price, not the U.K. domestic price.

SOFTWARE REVIEW; REDALERT MANUFACTURER: SOFTSYNC, Inc.

William Pierson

REDALERT is one of the best arcade type games available for the Timex-Sinclair 1000. This game is written in machine code providing some very fast action graphics. The cassette comes in an attractively packaged box with excellent instructions, including some tips if loading problems are encountered. The game requires the 16K Rampack. Once loaded the game is self-starting. I recommend that you read the instructions prior to playing the game for the first time. The numeric

PROGRAMMING YOUR TIMEX / SINCLAIR 1000 IN BASIC by

Mario Eisenbacher. An easy-to-digest format leads you through hands-on examples of programs in eorly chapters, then helps you develop skills you need to grasp and execute more complex programs. At eoch new level of understanding you get a vocabulary with definitions; a short, fancy program to run, prac¬ tice programs, exercise problems with answers, examples of errors along wifh explanations of how to prevent and solve them, ond a summary of what you’ve learned.

30 GAMES FOR THE TIMEX/ SINCLAIR COMPUTER by Bill L. Behrendt. Develop computing and problem-solving skills with challenges in deep spoce; gomes that forecast the future, magic mazes ond treacherous trials; oncient and modern war gomes, cliff diving, a reel predafor/prey simulation, o chance to be an artist; ond more. These exciting, all-new games with graphics come complete with instructions for running and ploying.

TIMEX /SINCUIR INTERFACING: TESTED PROJECTS FOR THE XZ80, 2X81, AND THE TIMEX /SINCLAIR 1000 by James M Downey and Don Rindsberg Now you con understand, design, ond go on to octuolly build useful input/ output devices for your computer. This book presents o series of step-by-step instruc¬ tions for such projects os o relay controller, digital-to-anolog converter, joystick interface, printer interface, onalog-to-digital converter, ond dumb terminal configurotion. Supplies you with construction techniques, programming considerations, trouble¬ shooting plans, BASIC listings for all programs needed, print¬ outs for the progroms used, and chip data.

~ =Prentlce-Hall=. =

I RETURN TO: Prentice-Hall / P.O. Box 512, W. Nyack NY 10944 I

■ Msir Timex / Sinclair 1000 In ■

BASIC (729871-4) @ $13.45 hardcover (reg. $17.95). _ copy(s) of 30 *

(918904-1) @ $7.45 hordcover I

■ i - copy(s) of Timex / Sinclair Interfacing (921759-2) @ |

_«13.45 hardcover (reg. $17 95) Poyment enclosed (publisher poys post- *

■ oge, money-bock guorontee) Bill □ me Bill my □ Visa or □ Mastercard I

I (New Jersey residents please odd applicable soles tax) ■

I* - - - - - ——Exp. _ _ I

Isionoture _ _ ■

_ - - - - - - ^ - ■

■Nome (print) _ _ |

-Zip — _ _ _

6P20005-A1(2)

keys 6, 7, 9 and 0 provide the movement controls for the ship as well as the fire controls for missiles and bombs.

The game starts with the ship appearing on the left hand side of the screen, the ground scrolling form right to left to give the illusion of movement. As you "fly" along fuel dumps (graphic H), enemy missiles (letter A), and enemy fighters ( ) appear as targets for your missiles and bombs. You can burst fire five missiles or drop three bombs at a time. Enemy fighters can also fire back at your ship. So be careful.

You are allocated three ships and 1000 units of fuel. The game continues until all three of your ships are destroyed or you run out of fuel. There is no provision for getting extra ships or fuel. Once a ship is de- stroyed, there is a brief pause, then the game continues.

Initial impressions of REDALERT are very good. There is none of the blinking effect noted in some of the previous ZX/Timex games. The small TS keyboard does require some getting used to, but after several games you can easily manuever your ship and zap the enemy targets. The game loaded the first time without difficulty. There is a pro¬ vision to save the game with variables to keep track of the highest score.

Included in the instructions are some ad¬ dresses to change game val-ues; for example, the number of ships, fuel dumps or enemy fighters. Tliis information is useful for increasing the difficulty of the game.

This has to be one of the best TS games I have seen on the market. The fast action graphics make the game interesting and exciting even after several hundred games. REDALERT is well worth the price of $15.95. I can highly recommend it to those who want a challenging game.

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26

There are two new advanced ccmputers on the market that may be of interest to Timex and Sinclair users.

The Sinclair QL (Quantum lp;;p:>

As reported last issue the QL is a new business and personal computer from Clive Sinclair and Sinclair Research, Ltd. The QL is already available in England, and Sinclair had hoped to be selling the computer to mail order customers in the U.S. by the third quarter of this year. However a recent hold~up in component delivery will probably delay LI.S. availabil ity until the

640K). The main microprocessor is a 32-bit 68008 chip containing SuperBASIC and QDOS. SuperBASIC is an enhanced BASIC featuring user-friendly commands and flexibility. (For the QL;. Sinclair has abandonned its one- touch keyword system). The operating system, QDOS, is multi-tasking and can maintain up to 20 program "windows" simul taneousy. QDOS also can support a 256-user local area network. The display is 85 columns by 25 rows (516x256 pixels, hi-Tes)or 40 columns by 25(lo-res).

fourth quarter. The announced price is $499. Four sophisticated programs are provided

The QL is said to be canparable to the Apple Mcintosh in every way except price - the Mac sells for about five times as much. The QL features a 65-key keyboard, two built-in microtape drives, 128K fWI (expandable to

with the QL; Quill - a word processor; Abucus - a spread sheet; Archive - a data base; and Easel - a graphics package. (All programs can share data with each other.) Ports are provided for a modem, a printer, joysticks, a monitor, a TV. and ne

The Memotech HTX-512

DISPLAY; 256 X 192 resolution , 16 colors which

For the last year and a half Memotech Corporation has developed and sold RAM paks, EPROMS, printer interfaces, and keyboards for Timex Sinclair Computers. With the announcement last year that Memotech was developing its oun microcomputer, many Timex users were naturally interested. The Memotech Krx-512 computer is now available. The advertisement appearing in several computer publications is very impressive. 64K R^ built-in, expandable to 512K (thus MTX 512), plus seperate 16K RAM for video output with a seperate processor.

can all be used simultaneously, 32 sprites, and eight user-definable windows.

INPUT/OUTPUT; Centronics parallel printer port, two standard joystick ports, cassette port (2400 baud) separate TV and monitor ports, 4-channel hifi port, ROM cartridge port, plus a uncommitted parallel I/O port (all standard).

LANGUAGE; MTX BASIC with abbreviated commands, MTX GRAPHICS, NODDY - an II - command language for children, and MTX ASSEMBLER (built into 24K ROM). PASCAL and FORTH availabe as add on ROMs.

KEYBOARD; 81 keys with numeric keypads, 8 function keys, auto repeat.

I

t

»

JRC Software Software for Sinclair and Timex Sinclair Computers Call (812) 752-6071 or 752-5106 John Richard Coffey 28 P.O.Box 448

Scottsburg, IN 47170

ITEM; Software 4ron\ JRC, PO Box 448, Scottsburg, IN 47170.

For the TS 2068

-The Great Graphics Show; The examples above are just two ot the many graphics display that can be done with the 'Great Graphics Show.*

-Three Games Package: Paint and draw with Colorsketch, using your joystick more than 12 single keystroke commands. 'Timing the Trash Compactor* is a cleverly animated game tor children and adults. *0odge-em* is a clasic race game with a surprising twist, fast and tough. -Hi Res Lander; The clasic space game with high-resolution realism and two difficulty levels. Requires skill and patience.

-Oscilloscope; Real time three-dimensional rotaion with dozens of possible patterns.

-Touch Type Learning Game; Introduces 197 symbols and tracks your progress. Educaional but fun game.

-Easy Editor; Fastest and easiest text editor ever in BASIC.

All six of these programs are available for $24.95 on a high - quality TDK tape. Also available seperately for $9.95 each.

For the TS 1000/1500

-Super Tape; Include Super Function Plot, 4-2K action games. Touch Type Teacher, Extensions to BASIC, Upper/Lower case on printer. Hi -Res on printer, and many more programs, mostly in machine code, on TDK tape for $24.95.

CURRY COMPUTER

Software & Hardware T/S 1000 and T/S 1500 T/S 2000 Series Write for FREE Catalog Over 60 Programs/Keyboards/Rampacks DEALER INQUIRIES WELCOME 5344 W. Banff LnJGlendale, AZ S5306 1-602-978-2902

KELTINORS KISEP {l6K)

A realistic adventure involving fighting, bribing, strategy and luck. Many rooms , levels , weapons , treasures and magic items. Dungeon and objects set up RANDOMLY. Packed with suprlseSk On cassette-$6;95.Free catalog with order. Send cheque or money order to: MILL RESEARCH 32749 Avalbn Gres. Abbotsford , B.C«, Canada V2T 3W9

ITEM; 5 programs -for the TS 2060 -from Sottsync, HE. 4th Street, NY, KY 10016.

“Gulpman: PacMan-Type game except Gulpman can shoot at his attacker. Joystick or keyboard control. 15 nazes and 9 speeds. (Ed. note: 1 liked it).

-Cyberzone; Space game. Voice-activated tiring (no joke!), joystick/keyboard control. Nice color and very fast. (Ed. note: Tra hooked).

-Voice Chess; Several ditticulty levels. Computer talked to the player with mildly sarcastic vocabulary. Nice game.

-Personal Accountant; General ledger, amortization program, address tile with 15-page booklet.

-Zeus Assembler: Machine Code programing.

All programs on cassette ($19.95, except Accountant, $24.95). These programs will be reviewed in upcoming issues.

HEM; Apropos Technology announces three new

program packages tor the TS-1000 and TS-1500

DR. FLOYD; A psychoanalytic artiticial I n tell I gence program which allows the player to carry on a "conversation" with the computer. Great tor showing others what a small computer can do.

GfWPHlCS PAK 1; A collection ot tive programs which allow the user to draw pictures on his TV screen through keyborad control. All creations can be saved to tape and recalled. One program allows placement ot any character anywhere on the screen. WORDPLAY; A collection ot tive English language programs which teach the player important points ot grammer and literature in a tun and stimulating manner.

All require 16K ot memory and sell tor $12.95 plus $2.00 S & H.

Mutual Funds Investors Timex 1000 Users

Two 16K programs to cover the mutual funds.

1. Mutual Fund Minder

• Keeps track ot stocks you own showing current value of investment, per cent gain or loss, and other data.

• Compares your account to others you select.

• Prints summary, details, and a graph, for quick analysis.

2. Mutual Fund Master

• Store entire mutual funds listing, up to 600 stocks.

• Select printout; choose minimum per cent gain for printing.

• Automatically prints when screen is full, if desired.

• Ideal for selecting funds for more frequent looks with Mutual Fund Minder.

The two programs compliment each other, and most complete analysis is accomplished by using both.

Programs are menu driven, and user friendly, with built in extras to facilitate use. Instructions with cassette.

PRICE: $19.95 each, or both for $34.95 + $2 shipping. California residents add 6V2% Sales Tax.

Compare this low price to what you would pay to subcribe to an analysis service.

For Free Literature

STOCK MARKET SOFTWARE 1556 Halford Ave. #236 Santa Clara, Ca. 95051

Partial Pascal

Pascal is a computer programming! language, very popular on microcom-j puters, invented by Professor Niklaus' Wirth of the Swiss Institute of I Technology. Partial Pascal is a subsetj of Pascal for the ZX81, Timex Sinclair 1000 and 1500.

Partial Pascal includes IF, THEN,! ELSE, CASE, OF, OTHERWISE, WHILE, DO, REPEAT, UNTIL, FOR, TO, DOWNTO, BEGIN and! END for program control; read readln, write, writeln, reset, rewrite, eoln, eof, inkey and text for input and output; +,

*, DlV, MOD, abs, chr, odd, ord, pred, succ and sqr for calculations; NOT, AND and OR for decisions; PRO¬ CEDURE, FUNCTION and FOR- WARD for subroutines; CONST, TYPE, VAR, ARRAY, Boolean, char and integer for data; copy, fast, slow, pause and halt for computer control; plot and point for graphics; and mem, mem2, memw, move and usr for machine language.

Partial Pascal executes much faster than BASIC because, as a compiled language, it doesn’t have to search thru tables to find variables or search thru line numbers as BASIC does for each goto, gosub or next. Partial Pascal’s 16-bit integer calculations are much faster than BASIC’s arithmetic.

Please note our new address. Partial Pascal is supplied on cassette tape with instruction manual. 16K RAM required. $30 postpaid from

Semper Software 585 Glen Ellyn Place Glen Ellyn, Illinois 60137

DATA ACOUiSITIOIM & T CONTROL SYSTEM FOR |

THE ZXB1/TS1000/TS1S00

* CENTRONICS PARALLEL PRINTER INTERFACE Supports LPRINT. LLIST, « COPY Keys

* REAL TIME CLOCK CALENDAR CHIP Battery Backup DY/MO/YR HR/MN/SC

* ANALOG TO DIGITAL CONVERTER

8 Channel 8 Bit 0-5 Volt Inputs 100 Microsecond Conversion Time » DIGITAL INPUTS - 8 TTL Compatible Monitor Switches, Contacts, etc » DIGITAL OUTPUTS - 8 TTL Compatible Control Relays, Motors, etc.

* ADDITIONAL FEATURES: Bus connector for other accessories. Resident EPROM with Software for all on-board devices.

User's Manual with Applications

"REPORT GENERATOR" AST + manual $89.95 Kit with parts 8 manual $69.95

Bare Board, software 8 manual $32.95 Add $3.00 for shipping USA

Service Available for c heckou t / repa i r

Dealer inquiries accepted

Send check or moneyorder. We also accept MC/VISA or call for C.O.D. shipment via UPS to:

ENER-Z COMPANY

P.O. BOX 635

fort WASHINGTON, pa

BIB-TST-oaSA 1S03A

The following is a list of good to excellent newsletters that we have seen from various Timex/Sinclair user groups.

T.S.U.6. Newsletter (tlO per year-monthly) Triangle Sinclair User Group c/o Doug Dewey

206 James St., Carrboro, NC 27510

C.A.T.S. Newsletter($10 per year monthly) Capitol Area Timex Sinclair User Group P.O.Box 725, Bladenburg, MD 20710

Keyboards ($15 per year-bimonthly)

Timex and Sinclair Bay Area Microcomputers P.O.Box 644, Safety Harbor, FL 33572 Editor; Mel Routt

TimelineZ (fl5 per year-monthly)

Bay Area T/S User Group P.O.Box 1312, Pacifica, CA 94044 Coordinator: George Mockridge

Boston Computer Society Sinclair Timex User Group Three Center Plaza, Boston, MA 02108 Director: Sue Mahoney

1 6K TS 1 000/1 500 ZX81

- presenting -

RANDOM SCRAMBLE

A challenging educational word game for your entire family. Helps build todays necessary vocabulary and spelling skills.

- FEATURES -

1 to 4 Players - 1 to 1 5 Rounds - 4Levelsof difficulty - Double option — Constant score display - Current/ Remaining round display- Unique end of game player recaps display all play, by round, for each played -2500 Word built in (bypassable) dictionary! - User friendly. Send $13.95 & $1.75 postage/handling. Visa/MC send number & expiration date. CT. residents please add $1 .05 sales/tax.

FUSION MICRO PRODUCTS

PARK SQUARE STATION P.O. BOX 15388 A STAMFORD, CT. 06901

CASSETTE TAPES- the highest quality tape is used to make these computer quality cassettes in a popular C-20 size, 10 minutes per side make these perfect for 16K programs. Each tape cofTies with two blank labels and a plastic case. Only $.80 each in quantities under 10. 10 for $7.50, 25 for $18.00, 50 for $34.00, or 100 for $63.00. On orders below $15.00 include $2.00 for shipping, on all others we pay shipping. Send check to; WMJ DATA SYSTEMS, 4 Butterfly Drive, Hauppauge, NY 11788, We have other size tapes available, send size needed and we will quote price.

CHECKREC— Introductory offer. Keep track of your checking account on a MC spreadsheet. Program will also reconcile your account account to your bank statement. TS1000/ZX81 with 16K. Provides hard copy if printer is used. Cassette $10.00. WMJ DATA SYSTEMS, 4 Butterfly Drive, Hauppauge, NY 11788. We have other software.

RAPID FILE, 16K, Basic/MC, more features, $10.95. Rapid Finance, 16K, 500 entries, $10.95. 3D Graphics, 16K or TS2068, please specify, tape $8.50, listing $2.50, Russell Brewer, 26630 Mill Rd., Frazeysburg, OH 43822.

Hum n-TS sinwii

■UCKJACX (Th* gam« of 21) (16K)

Enjoy this oxciting gamol Up to 6 ployorx may play. AH hands simuHanaously displayad. Las Vagas rulas apply, with compwtar holding all batsi Allows fitting pairs, doubling down ft insuranca. Graat for tasting your stratagy.

NHeHif UMUEKI (Manu drivan) (1 6K) Providas quartariy graphic display of your bill status, with bills duo saarch 1^ dasirad data. Summarias of axpansas paid, avaragas. ft oxpansa as % of incoma. Printar option indudad. '

CUEIUI PUMEI (Manu drivan) (16K) Scratchpad calandar. Up to 200 parsonal avants may ba filad. Add or daiats anytima. FHos stay in ordar of data! 12 aoarch modos dteplay appointmants, auto mant.. Hot«ay Do's, jobs, ate. Also allows viawing dasirad waak, month, or yaar.

$9.98 aach indudaa postaga (Ca. ras. add Salas Tax)

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tr WORKS

1(616)173-5164 Tvnpfwimt . $7.50

A Texi H«ndlin| Proffim

STATISnai GRAPH UNftATOR . $7.50

A Grtph Rroducinf Pro^f am

MUS AMAim.. . $14.50

A Saks Report Profrsm

HOME luocn GRAPHER . $7.50

A Home Bodtet Pro|ram

UVESOrSHTRA . $$,50

A Game at Skill and Faie lhrou|h the Mafic Cam

HARRY HO A THE MSAPPURIHG MAMONDS . . $0.50

An Interactive Adventure Game

MIX aiCUUTOt . $7.50

A Proframers AddrcM Cakulaior

SYMKH TAiU CCNitATOI . $7.50

An A&zmic Fik Utiliir (AM Proipvw UKJ

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ttmhrpiip— tndniWslA 51.54 fwWntbisjhS Hi TIm Whanl Wslii

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P.S.

A few parting comments

- If you like T-S Horizons, please let us know. We welcome all constructive criticism, because we do want to become the best Sinclair magazine you can buy.

- If you like us, support our advertisers. And be sure to mention where you saw the ad.

Most importantly, if you have any bad experiences with our advertisers - or any company dealing with T-S/ZX related items - please tell us. We iiot print ads from dishonest, unscrupulous companies, or from those who sell products that do not live up to the advertising.

Thank you,

Rick Duncan, Publisher

CHRISTIAN SOFTWARE

Bible Story Software

for T/S 1000

David & Goliath 12.95

The Ark 12.95

$1.50 shipping 7 handling others availame - send for free flyer Box 547, Bettsville, Ohio 44815 1-419-986-5217

5:ife

&

POWER SAVER 1 000 & 2000 BATTERY BACK-UP

UNINTERRUPTABLE BATTERY BACK-UP FOR ZX80, 2X81, T/S1 000, T/S1500, AND T/S2068

ALLOWS HOURS OF PORTABLE. FULLY OPERATIONAL, COMPUTING.

RECHARGEABLE BATTERIES INCLUDED IN CASE WITH LED TEST INDICATOR.

RETAINS MEMORY WHEN AC FAILS.

FULL 90 DAY WARRANTY!

H & Z ELECTRONICS THE BATTERY BACK-UP SPECIALISTS"

OFFER MANY FEATURES NOT FOUW I N “STMIL AR UNITS

Power Saver 1000-2000 is the state of the art in solid state design, in which numerous production models have been desioned, built and tested.

In respect we came up with a memory savino computer aid that allows fully operational computing when AC fails to operate the computer properly.

The P/SIOOO is fully incased with the highest quality rechargeable batteries available to meet the demands of your computer. Once discharged the batteries can be charged in either one of two positions explained in further detai 1 :

CHARGING:

Due to the unique design of the P/S1000-P/S2000 it allows you the choice of a "Fast" or "Slow" (trickle) charge position.

SLOH - With the P/ SI 000- P/S2000 in the slow position the user has full use of all of the computers functions, along with it capability of retaining memory when AC fails to run the computer properly. In this position the batteries are trickle charged as needed to keep them in peek operating conditions without affecting the operation of the computer in any way.

TAG T - This position has been built in for those of you who may wish to make your computer portable. In the fast charge position it allows you to restore the necessary charge to the batteries overni ght (approx. 6 to 10 hours from minimum operating point)*. However, in this position it is not possible to run the computer due to the fact that all of the supplies power is delivered into charging the batteries.

‘(NOTE: Due to the self regulation of the P/SIOOO it is not possible to overcharge the batteries in either the fast or slow charge position)

FULLY RECHARGES WITH COMPUTER'S * PLUG IN INSTALLATION, NO MODIFICA- POWER SUPPLY. CATION NEEDED.

P/S 1000

ZX80, ZX81 , T/S1 000, T/S1 500 $59.95 -BLACK

P/S 2000 (T/S2068)

$119.95- SILVER

LED BATTERY TEST:

The P/S1000-P/S2000 has a built in battery test feature that you will find quite unique and helpful. It is extremely easy to operate by depress- Ing the push botton switch on the P/S1000-P/S2000 labeled "Battery Test".

It will indicate the batteries capabilities. If the LED lights brinhtly there is enough of a charge to operate the computer. The LEO will consis¬ tently dim with the capabilities of the batteries to run the computer properly. When the LED does not light, it simply means the batteries are undercharged and are not reliable to run the computer.

WARRANTY :

The P/ SI 000- P/S2000 Is guaranteed to be free of defects due to workman' ship and components for 90 days from the date of shipment. If necessary, the P/S1000-P/S2000 may be shipped to us for repairs. If out of warranty - repairs will be made at a minimal cost.

(PRICE INCLUDES SHIPPING AND HANDLING)

Due to m

anufacturi

ng changes

- charge ra

ites I

nay vary slightly

(Wl RESIDENTS ADD 5% STATE SALES TAX)

SPECIFICATIONS:

SEND CHECK OR MONEY ORDER TO:

T/SIOOO:

APPROX. 3

-1/2 Hours

of Battery

Li fe

With T/S1016

APPROX. 7

Hours

of Battery

Life

Without T/S1016

H & Z ELECTRONICS

T/S2000:

APPROX. 7

Hours

of Battery

Li fe

With T/S2068 '

P.O.BOX 8761

MADISON, Wl 53708

The HUNTER Board

Add Memory that won’t Forget!

DESCRIBED IN JULY/AUGUST 1983 Badio EICOtrolliBS

^ ADD YOUR OWN SYSTEM UTILITIES

UP TO 8K NONVOLATILE RAM

BUILD UP A LIBRARY OF MACHINE LANGUAGE SUBROUTINES

USE HM6116LP CMOS RAM OR 2716/2732 EPROM

COMPATIBLE WITH 16K RAM PACKS

$3295

plus $1.95 shipping and handling

What a super product!... conceived and executed very nicely... and with quality components.

(SYNTAX QUARTERLY Winter 82)

For versatility this is even better than an EPROM... ranks quite high on the list of “must-haves”...

(SYNC Magazine Mar/ Apr 83)

Provides the user with instant software... an extremely versatile memory extension...

(Z-WEST June 83)

Complete kit with one 2K 6116LP-3 . $32.95

Additional three 6116LP-3 . $25.00

Bare pc board & manual . $13.05

Female connector 23/46 gold bifurcated . $ 5.00

Kit for EPROM use only . $22.95

Assembled & tested with 2K . . $47.95

Assembled & tested with 8K . $65.95

Shipping & handling per order . $ 1 .95

Send check or money order to the address below:

HUNTER, 1630 FOREST HILLS DRIVE, OKEMOS, Ml 48864