Serving Timex-Sinclair Personal Computers

SYNTAX

A PUBLICATION OF THE HARVARD GROUP

VOL. 4 NO. 2

ISSN 0273-2696

FEB , 1983

IN THIS ISSUE

WINTER CONSUMER ELECTRONICS SHOW REPORT

8K Programs

Sweethearts . 5

Blast . 5

When You Forget

Syntactic Sum . 6

Book Review

Mastering Machine Code

on Your ZX81 . 14

49 Explosive Games

For Your ZX81 . 18

Classified Ads . 19

Dear Editor . 10

Hardware Review

JK-310 . 17

Hardware Tip

Keyboard Conversion. .. 16 Machine Code Programming

Concatenating Machine

Code . 6

Mod To Use Hunter RAM

with > 32K . 18

News, New Products.. 1 ,2,3

On GOTO Statements . 5

Program Improvements....4 Software Review

Reversi . 8

Syntax Errors . 4

Users' Groups . 4

When You Forget Syntactic Sum . 6

Index to Advertisers

Brainchild Computer .... 18

Byte-Back Co . 4

CAI Instruments . 14

E-Z Key . 8

Frog Software . 17

Intercomputer Inc . 7

Kopak Creations, Inc... 15

Melbourne House . 16

Memotech Corp . 12,13

Sinclair Research, Ltd. .9

Sof tsync . 11

Timex's TS2040 thermal printer will hit the stores this quarter. Priced at $99.95, it matches both TS1000 and TS2000 machines in color and styling and works with either one.

Timex will deliver TS2000S, the US ver¬ sion of the ZX Spectrum, during 2nd quarter 1983. Priced at $199.95 for 48K RAM, this 8- color computer sets a tough value standard for others to meet. You'll also see a 16K version for $149.95. Timex also announced tiny (1 1/2 x 2 x 1/8) TS2000 cartridge software up to 32K ROM, priced below $25.

SYNTAX thinks TS2000S will differ from Spectrum machines by more than TV scan rate. We expect Sinclair BASIC listings will be mostly compatible and programs with ROM calls or systems variables will need modification. TS1000 tapes need special software to load into TS2000S and then need modified system variables and translation to ASCII.

As others hawked TS1000 clones for March or June delivery, Timex countered with a $15 rebate on TS1000S during the first quarter.

Mindware printers are in stores now and Mindware showed full screen dump on the MW100 Sidewinder using 1 3/4" wide tape plus 132 column x 12 line printouts printed lengthwise on the tape. We also saw Quickload operate — impressive, reliable and fast.

For those who must check out competitive machines, you'll want to see these: B/W — TI 99/2, Sanyo PHC20 , and VZ200; Color— Mattel Aquarius, Sanyo PHC25 , Spectravideo SV 318, & Panasonic JR 200 (Highest-priced last; all $99-299 at retail, available midyear).

FORTH enthusiasts — look at the Jupiter ACE, designed by Stephen Vickers and Richard Altwasser. Available in the US from Data- Assette of Oxford, PA, this machine has FORTH in ROM with the Z80A processor bus available at the rear. Many ZX/TS accessories will work with special cables.

Sinclair has discontinued kit sales.

1

NEW PRODUCTS AND SERVICES

Crash Guard, made of heavy acrylic, protects your 16K RAM from acciden¬ tal unplugging. $19.95, 10-day trial, satisfaction guaranteed. Expense Cutters Products Inc., POB 9543, Raytown, MO 64133.

Free machine code wall charts.

Send mailing tube/large envelope with name, address, zip and 35 cents for postage (stamps O.K.). Henri Poche', 5751 River Rd., New Orleans, LA 70123.

Zip-sorted, adhesive-backed mailing lists available: US user groups (about 60), $6 ppd; software sup¬ pliers (about 200), $11 ppd; hard¬ ware suppliers (about 85) , $6 ppd? ZX/TS owners being compiled, to add your name send it with address and zip. TSG Enterprises, 54 Richwood PI., Denville, NJ 07834.

Domino arcade game now available. Program on cassette, $9.95 check or MO. More info: JPR Software, Box 4155, Winter Park, FL 32793.

Biocal Software has a new free catalog. Send legal-size SASE to Biocal Software, 340 Cypress Drive, Fairfax, CA 94930.

Plug-in MEMOCALC gives spreadsheet analysis of any table of numbers. Screen acts as a window to table. Maximum size of table is determined by memory capacity? with 64K, you get up to 250 rows or 99 columns. Performs iterative calculations and re-evaluates. Memotech Corp., 7550 W. Yale Ave., Suite 200, Denver, CO 80227, 303/986-1516.

Blank C-5, C-10 and C-12 computer tapes, labels, packaging and mar¬ keting, data cassette duplication. PC board layout and manufacture for your hardware. Limited disk and EPROM duplication. Free brochure. Computer Engineering Services, P.0. Box 1222, Show Low, AZ 85901.

Loan Analysis Program (needs 16K) reduced. Helps analyze loans, cal¬ culate compound interest and depre¬ ciation. Also calculates monthly payment for existing or new loan? duration of pay back on loan; af¬ fordable loan amount? amortization tables and more. On tape $9.95 plus $1.50 P&H. R.S. Panwar, 2035 Kentland Dr., Houston, TX 77067

32K plus I/O unit gives 4 parallel I/O ports and 32K memory to ZX/TS. Unit plugs into back of ZX/TS and connects to other devices. Can interface to A/D converters and temperature probes through ports. Complete unit (4 ports, 32K, cables for ports, documentation) is $155 +$4.95 P&H. Partially populated board (I/O ports and room for 32K expansion later) is $50+$4.95 P&H. Wisconsinc Electronics, POB 332, Milton, WI 53563.

METAGRAPHICS creates drawings with over 2000 graphics characters and backrounds, $12.95. Needs 16K, on tape. Calliope Software, 4130 Coe Dr. NE, Albuquerque, NM 87110.

GRAPHPAK features bar graphs, line graphs, pie charts and area graphs. Plots data and helps in financial planning. 10K BASIC program on tape is listable. $14.95 with P+H. Practical Computer Products, 21111 Strathmoor Ln., Huntington Beach, CA 92646.

Decision Maker helps you decide by helping you evaluate options. It scores points statistically and ranks options in order of benefit. Career Path is based on psychologi¬ cal theory linking personality to career decisions. Both need 16K, are user friendly, documentation, $14.50 each plus $1.50 P&H. Melear Marketing, 3615 Saxon Way,

Marietta, GA 30062, 404/977-1295.

SixPac includes FORTH interpreter/ compiler, spreadsheet, inventory management, calendar, household

2

budget, and data base management programs. Each program includes documented source listing and in¬ structions; needs 16K. Package, $24.95+$3 P&H. SofTek, Box 4232, Santa Fe, NM 87502.

Prevent memory module "wobble and die" syndrome. RAMSTRAP holds RAM pack in place. $3, $3.50 outside US. RAMSTRAP, 104 Ridgeway Ave., Louisville, KY 40207.

TS1000S with built-in rechargeable battery back-up protect against temporary power loss, also power 16K RAM pack (not supplied). Power on/off switch and indicator LEDs provided. TS1000-B30 ($129.50 ppd. in US) runs on battery up to 30 minutes, TS1000-B60 ($142.50) pro¬ tects against power loss up to 1 hour. FOURIER Analysis and Synthe¬ sis evaluates harmonic content of repetitive waveform. Inverse oper¬ ation, constructing wave that re¬ sults from known harmonics, is also possible. Comprehensive data re¬ view, editing and graphing routines included. Tape includes sample runs and memory saver version for higher resolution. Needs at least 16K; listing and documentation $12; listing, documentation, tape $17 ppd. MULTIPROGRAM gives multiple program storage and assumes no pre¬ vious knowledge of MC programming; step-by-step instructions take you through block transfers. Needs at least 16K, tape and instructions $10 ppd. Battery back-up plans with schematics and parts list, $10 ppd. Syncware Co., POB 5177, El Monte, CA 91734.

f/22 Press cuts their 16K Darkstar darkroom package (Oct.82 New Pro¬ ducts) to $400. Tape with instruc¬ tions, $49.95. f/22 Press, Bx 141,

Leonia, NJ 07605, 201/568-6250.

Hunter's 8K nonvolatile RAM board kit now comes supplied one 6116LP3 (150ns) CMOS RAM at no extra cost. Low power 6116 chip means lithium

should last 10 times longer — fully populated board should retain mem¬ ory for about 2 years. Assembled and tested version, $46.90; Kit, $31.90 with P&H. Hunter, 1630 Forest Hills Dr., Okemos, MI 48864.

Draw and Recall lets you draw on your TV screen and store picture for later recall. Similar to Tur¬ tle graphics, enter an angle and distance, and program draws the line. Includes erase, move without drawing, delete, display screen position. Needs 16K, tape with directions $6.95 +$1.75 P&H. Plan displays with 8 1/2" x 11" graphic grids, with line and column num¬ bers, X and Y coordinate numbers. Pack of 100 $3.95+. 75 P&H. New newsletter for ZX/TS owners, first issue free to SYNTAX readers; send SASE. Trig Teacher program teaches basic trigonometry, includes exam¬ ples. $6.95+$1.75, on tape with directions. Needs 16K. Friendly Computer, P.O. Box 122, Walling¬ ford, PA 19086.

In-Line Load Monitor helps you load taped software every time. In-Line Voltage Dropper lowers computer voltage so computer and RAM pack run cooler. Assembled with direc¬ tions, $12.95 each plus $1.50 P&H; add 6% tax in NJ. M.C. Hoffman Co., POB 117, Oakland, NJ 07436.

Big selection of ZX/TS-related US and Canadian products. Free mail order list for customers and full product listing for prospective dealers. Integrated Data Systems, 11 Brighton Ave., Toronto, Ontario, Canada M4M 1P3, 416/466-5571.

16K tape programs: Math Raiders, Superchess, Alpha and Vowel Tutor, and Night Gunner. The Adventures of Quest for the Holy Grail and The Elusive Mr. Big K give you a new version everytime you load. $14.95 each except Superchess, $19.95. Softsync, 14 East 34th St., New York, NY, 10016. 212/685-2080.

USERS' GROUPS

Our latest list of new users' groups is presented below. To locate or announce a group not listed, drop us a line (please include self-addressed stamped envelope) or give us a call at 617/456-3661. SYNTAX, RD 2,

Box 457, Harvard, MA, 01451.

Chateauquay, PQ, Canada: H. Oeder, 305 Radisson, Chateauquay, PQ,

J65 1W6 Canada, 514/691-4433.

Holly Hill, FL: Richard Sirekis, 941 Oleander Ave., Holly Hill, FL 32017.

Lubbock, TX: Wayne Hamlin, Box 6342, Lubbock, TX 79413.

Manhattan Beach, CA: J. Petersen,

2316 Walnut Ave., Manhattan Beach, CA 90226, 213/545-9581.

Milwaukee, WI: The ULTRAGROUP,

6808 N. Park Manor Dr., Milwaukee, WI 53224.

Gainsville, FL: Timex Users Group, 3708 Newberry Rd., Gainsville, FL 32607, c/o Skipper's Electronics 904/373-6796.

Glen Aubrey, NY: Sinclair Computer Users Society, P.0. Box 92, Glen Aubrey, NY 13777.

Groton, MA: Sinclair users group for people under 16. Aarre Laakso, 74 Ames Rd. , Groton MA 01450.

64K MEMORY M-64 $119.9£t

129.95 WIRED & TESTED IN STOCK. SAME DAY SHIPMENT All standard features included, plus lower 8K of RAM can be disabled in 2K segments to allow PROM or peripherals to be added.

EXPAND YOUR 16K SYSTEM $59.95

If you have a Sinclair 16K RAM module and neecT more memory, expand it to 32K and beyond by usinq BYTE-BACK M-16 MEMORY MODULES.

You can’t connect two Sinclair 16K RAM modules together, but you can connect one Sinclair 16 K and one or more BYTE- BACK 16K modules to get all the memory you need

THOUSANDS IN USE WITH PROVEN RELIABILITY

M-16 $59 .95 Kit. $69.95 wired and tested.

_ IN STOCK. SAME DAY SHIPMENT

BB-1 Control Module, with 8 relays, 8 leds

& 8 inputs. $59 Kit. $69 wire and tested. _ _ IN STOCK! SAME DAY SHIPMENT

MODEM with RS232 Port $119.^,

90-Day Warranty On All Modules. 10-Day Return Priviledge ORDER PHONE 803-532-5812

Add $4.95 shipping & handling to all orders.

BYTE-BACK CO. CHECKS

Rt. 3 Box 147 Brodie Rd. I

LEESVILLE, SOUTH CAROLINA 29070

Puerto Real, PR: ZX/TS Users' Group, Sergio Perez Davila, Box 38, Puerto Real, PR 00740.

Santurce, PR: Max Ramirez de Arellano, Box 6759, Santurce, PR 00914.

SYNTAX ERRORS: Crash Guard, Jan. New Products, was listed at $10.95. Actual price is $19.95.

John Jarrett of Computer Engineer¬ ing Services called to say that his video upgrade kit (adds SLOW mode to 8K ZX80s) does in fact work with new (bug-free) 8K ROMs if installed properly (Dear Editor, Jan. 83). Hint: the wire from point G must be separate and as short as possi¬ ble. C.E.S. no longer sells com¬ plete kits. Printed circuit board plus parts list and directions now $12.95. Computer Engineering Ser¬ vices, POB 1222, Show Low, AZ 85901, 602/537-7522.

M.C. Hoffman's catalog, Jan. New Products, costs $1 (refunded with order). The clip is free.

PROGRAM IMPROVEMENTS/REFINEMENTS

Richard Cox sent this change to speed play and add headings to BLACKJACK (Jan.-Apr. 82) :

5 FRST

©05 PRINT RT 506 PRINT RT 755 PRINT RT MDEfiLER"

** 6LRCKJRCK ** 18,0; * YOU" ;TfiB t*;

SWEETHEARTS — 8K/1K

Draw a heart with a valentine message in the middle. You can change the message with 210 PRINT AT 6 ,11? "I LOVE YOU" and add your name at the bottom with 220 PRINT AT 18,20? "xxxxx" (replace xs with your name). To run, GOTO 30.

Larry Allen, Owensville, IN

1© PRINT RT R,B;CHR$ 151

3© RETURN

30 FOR R = 1 TO 4-

4-0 FOR B=ll-R TO il+R

50 GOSUB 1©

60 NEXT B

70 FOR B =20 — R TO 2© +R S© GOSUB 10 9© NEXT B 10© NEXT R 110 FOR R=5 TO 9 120 FOR B=7 TO 21 13© GOSUB 1©

14-© NEXT B

15© NEXT R

16© FOR R~10 TO 17

17© FOR B=R— 2 TO 33 -R

18© GOSUB 1©

19© NEXT B 20© NEXT R

210 PRINT RT 6 , 13; “HRPPV " ; RT 7, 11; " URLENT INE **

SYNTRCTIC SUM: 224-3©.. 8K ROM

BLAST — 8K/16K

Combining Robert Nappi's Star Hunter (Nov.82) and Dan Tandberg's Blast Effects (Aug. 82) with my own programming resulted in Blast.

You fire your cannon by hitting 0. Hit 7 to aim the cannon up and hit 6 to aim down. To RUN, GOTO 2. Inverse video lines are:

2 "BLAST — A SHOOT OUT"

60 "(space, 27 times)"

200 "ER7 "

355 "SMASH"

420 "YOU STINK — I WON"

50 SLOW 60 LET R*=

St

7© LET B $ = ** XXXXXXXXXXXXXXXXXXX XXXXXXXX"

30 LET G* = " ***********3-****-*** 9© LET

IQ© LET 1$ = **

it

11© LET u* = "

120 LET R=ll 130 LET B=©

14-0 LET 0 = INT CRND+20J +1 15© LET U =0+8

16© IF O— R >W— B THEN GOTO 14-©

17© CLS

IB© PRINT RT 8,25; P 20© PRINT RT R,B;"^»“

21© PRINT RT R + l ,B; "

22© PRINT RT R-i ,B; **

23© IF INKEY$ = **6*! THEN LET R=R —

1

24.0 IF INKEY$="7" THEN LET R=R +

1

258 PRINT RT O, «;"<+>"

26© LET U=U-R

27© IF U<2 RND RBS CR-OJ <2 THEN GOTO 42©

26© IF U <2 THEN GOTO 12©

290 IF INKEY *="0" THEN GOTO 31© 30© GOTO 20©

31© PRINT RT R,B+3; R*; RT R,B+3; B*; RT R,B+3;G*;RT R,B+3;H*;RT R , 8+3; I*; RT R,B+3;J$;

32© PRUSE 5

34-0 IF R=0 THEN GOTO 350

35© SOTO 200 _

355 LET

356 LET

36© PRINT RT 0,U;K*;RT 0,U;U$;P. T 0,U; K$;RT 0,U;U*;RT 0,U; K$; RT O , U; U*; RT 0,U; K*; RT 0,U;U$

37© LET P=P+1S©

38© PRUSE 2©

390 IF P > 150© THEN GOTO 4-5© 4-00 GOTO 12©

42© PRINT RT 0,U;"|

43© PRUSE 10©

44© GOTO 2©

45© CLS

46© PRINT RT 15,©; "YOU UGN" , , , , "WITH 9^1© LUCK RND l.«'l© BRRIN" , , , "TRY RGRIN"

47© PRUSE 20©

48© CLS 49© GOTO 2

SYNTRCTIC SUM: 11515, BK ROM

ON GOTO STATEMENTS

James Eischen, Windsor, CT

1 SRUE "BLRS3"

2 PRINT RT 10,5;

3 PRINT RT 17,4; "PRESS RNY KE Y TO STRRT"

4 IF INKEY* =" " THEN GOTO 4

5 CLS 1© RRND

2© LET R=©

3© LET P=©

4© LET R=R+1

Many BASICS give useful ON... GOTO.. .statements which, unfortu¬ nately, ZX/TS BASIC lacks.

Let's tell our computer ON A GOTO 125, 385, 720. It goes to 720 if A=3. The computer goes to the line which lies Ath in the list.

One way to mimic this command is to substitute IF A=1 THEN GOTO 125, IF A=2 THEN GOTO 385 and so

5

on. These multiple IF statements eat memory, but replacing ON A GOTO with GOTO G(A) can work.

DIMension numeric array G with as many elements as line numbers in the ON. ..GOTO list; assign each element in G with a line number.

Our example uses LET G(l)=125,

LET G(2) =385 , LET G(3)=720. Do this in immediate mode (with no line number) to save memory, then remember to use GOTO 1 instead of RUN to avoid erasing G.

Robert Nee, Maplewood, NJ

WHEN YOU FORGET SYNTACTIC SUM — 8K

If you have just entered a pro¬ gram from SYNTAX or SQ and want to check Syntactic Sum but neglected to load the program, add the fol¬ lowing program and RUN 9600. You can use either FAST or SLOW mode, but SLOW takes some time. To check that you have entered it correctly, enter Syntactic Sum by itself and RUN. "S" equals zero.

Lloyd Painter, Quakertown, PA

9600 LET 5=0

9601 FOR R=16509 TO PEEK 16396+2

56+PEEK 16397-1

9602 LET 5=5+PEEK R

96©3 NEXT R

9604- PRINT **S = '* ; 5-7323

SYNTRCTIC SUM: 7323, 6K ROM

CONCATENATING MACHINE CODE — 8K/IK

When you want to use two or more machine language routines in one program, there's no need to load them separately. Since each machine language routine is com¬ plete within itself, it can be placed one after another in one routine and individually called by referring to their beginning ad¬ dresses. Converting machine code to hexadecimal and writing the resulting hex in a REM line makes concatenation easy. The example program contains the hex repre¬ sentation of the Syntactic Sum

program (Jun.81) and the Renumber routine (Jun.82).

Before you typing or loading (regardless of attached memory),

POKE 16388, 198

POKE 16389, PEEK 16389-1 and NEW

to reserve memory for ML routines.

Type SAVE, RUN and write down the displayed values. The first value shown is the beginning ad¬ dress of the first routine (Syntac¬ tic Sum). PRINT USR that value to get Syntactic Sum. The second value represents Renumber's start¬ ing address. RAND USR that value to renumber.

Renumber makes the first line of the program 10 and increments by 10. It does not renumber GOTO and GOSUB destinations. You must edit them individually.

In line 4, 16628 was calculated by adding 2 less than the number of characters in REM line (114) to the address 16514 (16514 is the address of the first byte of machine code in line 10). In line 5, 16576 is the number of characters in the first routine (62) added to 16514 and marks the beginning of the second routine. Number 198 in the above POKE is 256 less half the total number of characters, 58.

Line 2 gets the beginning address of the first routine and line 5 gets the second routine.

Line 6 PEEKS hex from the REM line, and converts it to decimal, then POKES it to reserved memory.

Rolf L. Miller, Ventura, CA

1 REM 2 17D4.0ED5B0C4-0DD2 100007 CBR20087DEB2004.DDE5C1C94.E8600DO0 923 18EC2 17D40110ft00722373234E234 623097ED676C80a0R00£B09EBi8EB

2 LET R=PEEK 163S8+PEEK 16389 +256

3 PRINT R

4- FOR X = 16514- TO 16626 STEP 2

5 IF X=16576 THEN PRINT R

6 POKE R, (PEEK X-23> +16+PEEK <X+1) -26

7 LET R=R+1

6 NEXT X __

SYNTRCTIC SUM: 14-&84-, SK ROM

6

giimgMB s ®f m m m

ST HUI

lhT€RCOMPUT€R INC

HARDWARE AND SOFTWARE PACKAGES

MAKE THE MOST OF YOUR TIMEX SINCLAIR 1000

MEMOTECH PERIPHERALS

MEMORY EXPANSIONS

• 16K RAM # PL7002 $ 59.95

• 32K RAM # PL7003 $109.95

• 64K RAM # PL7004 $179.95

• HIGH RESOLUTION GRAPHICS (16K RAM)

# PL7007 $144.95

• PLUG-IN KEY BOARD # PL7011 $99.95

• CENTRONICS PARALLEL INTERFACE # PL7005 $104.95

• MEMOTECH RS232 INTERFACE # PL7006 $139.95

PRINTERS

• SEIKOSHA GP-100A PRINTER The revolutionary low- cost dot matrix impact printer— Uses up to 9.5” paper

# PL7008 $349.00

• SEIKOSHA GP-250X PRINTER The most intelligent programmable graphic printer— Uses up to 9.5” paper

# PL7009 $449.00

• PRINTER-INTERFACE CABLE #PL7010 $19.95

• MEMOCALC Software on plug-in EPROM cartridge — Spread sheet analysis— Up to 7000 numbers (when used with 64K) # BS200C $59.95

HOME MANAGEMENT

• BILL ORGANIZER Keeps track of bills, amounts due, date due, finance charges, payments made, etc. Sum¬ marizes all data for tax purposes. # HM5001 $14.95

• CHECK BOOK Balances and maintains your checkbook. Finds all checks written to one payee easily. Add a printer and it will even write checks for you.

# HM5002 $14.95

• ADDRESS BOOK Store, update and retrieve names, addresses, and phone numbers. With a printer attached, it will print mailing labels, sorts entries alphabetically by name, or by Zip Code. Only remember part of a name? It will find records from incomplete informa¬ tion. Code the entries for special purposes, i.e. Christmas Cards, Party Invitations, etc. # HM5003 $14.95

• OCCASION CALENDAR Keep track of birthdays, an¬ niversaries, meetings and special events. Have your calendar appear on the screen at the touch of a key.

# HM5004 $14.95

All programs use 16K RAM.

ENTERTAINMENT

QSAVE A Hardware-Software Combination— Allows a baud rate of 4000 to be achieved com¬ pared with only 250 on the normal SINCLAIR ZX81— Loads and saves a full 16K in only 29 seconds— Works with 16K and 64K. # PL7001

Dealers and Distributors Inquiries Welcome

I - 1

| Mail to: Intercomputer, Inc., P.O. Box 90, Prudential Center, |

| Boston, MA 02199 |

PART # QTY. UNIT U.S. $ TOTAL







Shipping and Handling Printer	9.95
Shipping and Handling Memotech Products and QSAVE	4.95
Mass. Residents Tax	5% Total

□ Check □ Mastercard □ Visa

Account No _ Exp _

Name

Address

City State Zip

EDUCATIONAL ADVENTURE SERIES

• EDUVENTURE I Answer the questions encountered in each classroom until you make it outside for RECESS and the surprise that awaits you there. (Grade level K-3)

# ED3001 $12.95

• EDUVENTURE II Each new situation requires either your ingenuity or knowledge (or both) to avoid being sent to the principal’s office. (Grade level 4-6)

# ED3002 $12.95

• EDUVENTURE III Solve complex puzzles to outwit your teacher and achieve the highest scores. (Grade level 7-9) # ED3003 $12.95

• EDUVENTURE IV An agile mind and quick reflexes will get you through this maze of mysterious situations- to your DIPLOMA. (Grade level 10-12) # ED3004 $12.95

All programs use 16K RAM.

NEW products coming soon: Software on ROM/EPROM CARTRIDGES — SOFTBOXtm . A software library which can contain several ROM/EPROM programs. Plug in your computer and instantly call any program from your SOFTBOX — A full line of software and peripherals for the "colorful ZX SPECTRUM/TIMEX SINCLAIR 2000.

For more information, Free Brochure, and Special Package Discount, write or call:

IC INTERCOMPUTER INC.

P.O. Box 90, Prudential Center Boston, MA 02199 Tel: (617)437-1190 Telex: 951141 COFAR

•MISSILE LAUNCHER Challenge the enemy by destroying his ammunition stored in different locations.

# FG1002 $12.95

• KRAZY KONG A new version of the popular arcade game. This program has all the features of the original and is every bit as fast. # FG1013 $12.95

• GHOST HUNT Gobble your way through a maze of Ghosts, Power Pills, etc., etc., very fast. # FG1014 $12.95

• MAZE DRAG RACE Drive through a giant maze 9 times the size of the screen, watch out for other cars, rocks, oil and ice. A really superb machine code game. #FG1015 $12.95

• DEMOLISHER Design an intelligent strategy to demolish a growing wall before it crushes you.

# FG1005 $12.95

• MCODER Compiles a BASIC program into machine code— Extremely simple to use— Write and debug your Basic programs— Enter the MCODER— the Basic pro¬ gram will be compiled into machine code as you watch. # PT4001 $18.95

• RETURN FROM SPACE # FG1001 $12.95 •JEOPARDY # FG1003 $12.95

• VEGAS # FG1004 $12.95

• AIR ATTACK # FG1006 $12.95

• GUARD THE PRESIDENT # FG1007 $12.95 •SUBMARINE #FG1011 $12.95

• COMBO PACK I Contains Return From Space and Missile Launcher # FG1008 $18.95

• COMBO PACK II Contains Vegas and Jeopardy

# FG1009 $18.95

• COMBO PACK III Contains Demolisher and Air Attack

# FG1010 $18.95

• COMBO PACK IV Contains Guard The President and Submarine # FG1012 $18.95

All programs use 16K RAM.

Limited warranty— Defective Software will be replaced if returned within 30 days.— Memotech Products: 180 days— Seikosha Printer: 90 days

SOFTWARE REVIEW

Program: Reversi

Price: $19.95 plus $2.50

ROM/RAM required: 8K/16K Printed listings? No Program listable? Yes Challenge: Fair

Good

Peter Ulrich Zeta Software POB 3522 Greenville, SC 803/246-1741

Display: Written by: From:

(P&H)

29608

Zeta's Reversi offers many im¬ pressive features. Machine code makes it quick and responsive. You choose among three modes of play and ten functions. You can play against the computer or your ZX/TS can play both sides.

One function calls a list of possible moves giving coordinates and a rating of + (plus) or - (minus) 0 to 9. This list can be used by both computer and player

IT’S HERE!!

The keyboard you have been waiting for!

A LARGE 60 KEY TACTILE FEEL KEYBOARD (MEASURES 10" x 4”) THAT PLUGS INTO THE SAME CONNECTORS AS EXISTING KEYBOARD ON YOUR ZX81 OR TIMEX SINCLAIR 1000. IT HAS ALL SILKSCREENED LEGENDS IN 3 COLORS ON THE BASE; MOLDED LEGENDS & GRAPHICS ON KEY TOPS; 8 AUTOMATIC SHIFT KEYS (NO SHIFTING REQUIRED) FOR EDIT, DELETE, SINGLE & DOUBLE QUOTES, COLON, SEMI-COLON, FUNCTION & STOP; 5" SPACE BAR; 2 SHIFT KEYS; NUMERIC KEY PAD.

ONLY $84.95

MASS. RESIDENTS ADD 5% SALES TAX SHIPPING & HANDLING $4.00/UNIT

DELIVERY 4 - 6 WEEKS. QUANTITY DISCOUNTS. WE WILL ACCEPT MC/VISA. PLEASE INCLUDE #’S, EXP. DATE AND SIGNATURE. FOR MORE INFORMATION SEND SASE. SEND INQUIRIES, CHECK OR MONEY

order TO: E-Z KEY SUITE 75B

711 SOUTHERN ARTERY QUINCY, MA 02169 617/773-1187

and lets you see how your ZX/TS decides what move to make. This function takes from 6 to 40 seconds depending on the number of possible moves and your choice of FAST or SLOW. There are ten levels of play but the response time is about the same for each? 3 seconds in FAST mode and 12 seconds in SLOW mode.

Entire game listings of com¬ pleted moves may be called up on screen at any time. Or if you are unable to complete a game you can save your game that's in progress for later play.

It says in the catalog you can take back moves but, I found this somewhat misleading. With each move, your choice appears on the display board with an option to enter or delete your choice. You also can alter your position by entering coordinate and color one disk at a time. This can be tedi¬ ous if you want to enter a middle or end game position.

If you were a U.S. Othello Association member you might be disappointed in Reversi. Starting disk placement is off by a 90 de¬ gree rotation. Also its style of play seems to have been taken from refuted strategies of Hasegawa's book How to Win at Othello. Your ZX/TS computer takes an opportunity to take the lead as soon as possi¬ ble and flips way too many disks for opening and midgame play.

Playing Zeta's Reversi against Fidelity's Reversi gave interesting results. With Zeta's Reversi at its highest level in all games it lost as black and white against Fidelity's Reversi at its lowest level. But with Fidelity's Reversi at level 10 (of 18 levels) Zeta's Reversi did much better losing as black 31-33 and winning with white by a wipeout at move 30.

For those players who have not studied or played Othello exten¬ sively, Zeta's Reversi provides sufficient challenge.

8

David Ratliff, Magee, MS

Games that chalknge you at a price that won't

S!

YOU ZX-81

01 E2-E4- E7-E5

02 B1-C3 B8-CB

03 F1-C4 D8-G5

04- B 1 — R3

INURLID MOUE 04- D1-F3 G8-F6

05 F3-D3 G5-G2

06 C3-R4- G2-H1

07 G1-F3

INURLID MOUE 07 H2-H4- Hl-Gl

CHECK

08

'OUR MOUE WITH THE 6|

BACKGAMMON

FLIGHT SIMULATOR


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si:	EMum feet a EETO KNOTS oil
• + i T	8CN R - BRG D5T IPBEEF! F\|- GESR HQ p\|l

MIXED GAME BAG

CUBE GAME

Look to Sinclair for the only $79.95 computer and the first Serious Games Package.

A special limited time offer. Call toll free today.

What could be more challenging than creating your own games on a personal computer? Or being intellectually challenged by serious games where you match wits with a computer or another opponent in a fierce trial of skills?

The Timex/Sinclair 1000* is a fully program¬ mable computer with a powerful BASIC language and complete instruction manual, all for only $79.95. The moment you sit down with the TS1000 you can learn how to program your own games. Maybe you want to create a stock market game, a word game, a mathematical game.

The challenges are endless.

For this one low price, the TS1000 comes with everything you need for connecting the computer to your color or black-and-white TV.

Of course, you might also want pre-programmed software cassettes for your $79.95 computer.

You’ll have a wide choice with our free software catalog which comes with the TS1000. And the software cassettes play in any cassette recorder.

The 16K Memory Module. More power to you.

Let’s say you want to go one step further. The 16K Memory Module allows you and your family to be challenged by even more sophisticated games. Not mindless arcade games, but serious, intellectually stimulating games which are both fun and educational.

The Memory Module costs only $49.95 and plugs onto the back of the TS1000 for 8 times more memory capacity. A whole new world of software is available to those with the 16K Memory Module.

The Serious Games Package. _ A $75 value for only $50. _

For those who want a lot of serious 16K games, Sinclair announces a special software offering with a $25 savings! Now, for the first time, you can receive all five games shown above at the reduced price of only $50.

Chess: You can play with another opponent or you can match wits with the computer.

Flight Simulator: Maneuver and land a light aircraft with full cockpit controls, instrumenta¬ tion and navigational aids. You have to allow for wind velocity and direction, rate of descent and mountainous terrain.

Cube Game: Every bit as mind-baffling as Rubik’s Cube.

Backgammon: Everyone’s favorite. Again, you can play against another opponent or against the computer. Complete with a doubling cube.

Mixed Game Bag: A series of memory and con¬ centration tests including Robot Wars, a version of “Master Mind’.’

There’s never been a better value on a serious games package. And to think it all starts on a $79.95 computer!

_ Why order today? _

In addition to saving $25 on software, there are other reasons to buy your TS1000 today. Com¬ puters costing hundreds and even thousands of dollars rarely offer you games this serious or challenging.

Another reason to order today is convenience, by toll-free phone. No crowds, no waiting lines, no parking worries. It’s never been easier to get started in the world of computers. Or more worthwhile.

How to order today!

Just call our toll-free number and use your MasterCard or VISA. Or send the coupon with a check or money order. Then try out the Timex/ Sinclair 1000 for 10 days at no risk. If you’re not entirely satisfied, we will refund your money. It’s as easy as that. (Sorry, no refunds on software.)

Call toll-free: 800-543-3000. Ask for operator 509. In Ohio call: 800-582-1364. Ask for operator 509. In Canada call 513-729-4300, operator 509. Have your MasterCard or VISA ready when calling. Phones open 24 hours a day, 7 days a week. These numbers are for orders only.

If you simply want information, please don’t call, write Sinclair Research, Ltd., 2 Sinclair Plaza, Nashua, NH 03061.

Call toll free 800-543-3000

- (operator 509) -

Rd code: Mail to: Sinclair Research, Ltd. j B2SX One Sinclair Plaza, Nashua, NH 03061 1

| □ Check or Money Order enclosed

	Price**	Qty	Amount \|
TS1000	$79.95
16K Memory Module	$49.95
16K Cassettes	$15.00 each
Special Serious Games Package (5 games valued at $75.00)	$50.00
1 Shipping/Handling	$ 5.00		$ 5.00 \|

**U.S. Dollars Total: | _

Cassettes for 16K Memory Module: ,$15.00 each. Check the boxes of all the cassettes you want.

□ Flight Simulator #6 □ Mixdd Game Bag #26

□ Chess #7 □ Ill take all 5 cassettes

□ Backgammon #8 included in Sinclair’s

Name

Street

City

State Zip

* Sinclair technology is the heart of both the ZX81 and the Timex/Sinclair 1000 computer.

Sinclair-

DEAR EDITOR

I noticed several letters indicating dissatif action using a flat ribbon cable to add an external keyboard.

As an alternative, use number 28 or 30 wire-wrap wire. It posi¬ tions nicely between components and exits at most any location between case halves.

Paul Hise, Jeffersonville, IN

If you hook your ZX/TS to an on-line system or service such as CompuServe, do you still have your cursor system available? Will the first key you press be the command word above it?

Christopher Fickett, Burlington, MA

When you add a modem to your compu¬ ter, you use it with a program that defines the behavior of your compu¬ ter. You can compare your ZX/TS plus modem plus software to a game program — while you use the game, the program controls the behavior of the keyboard and screen. Thus, availability and utility of the ZX/TS cursor system depends on the software you use. Generally com¬ mand words will not be the first response, nor would that be useful since other systems would not read the byte sent as a keyword. — KO

In the event anyone wants to connect a video monitor to the ZX/TS, the procedure is:

1) Open the case and expose the side of the board with ICs and RF modulator .

2) Open lid of the RF modulator.

3) Remove all connections from output of the modulator.

4) Leave the three connections removed, tied together.

5) Solder plastic coated copper wire (solid) to center pin of output on the modulator (where the three connections used to be) .

6) Solder the other end of the

bare wire input to modulator (wire closest to board edge) .

7) Replace lid on the modulator and close case.

This procedure is quick and easy. The video monitor must be set on "Hi-Z" only. The picture is clear, sharp and stable.

Gerry Rolle, San Jose, CA

When I read the premier issue of SQ, I was upset by the hardware review of Touch-A-Matic keyboard overlay. I use my ZX81 every night for my users group, and find it hard to type on a regular keyboard. When I saw Kopak Creations' ad in SYNTAX, I ordered it. Two days later I received my Touch-A-Matic in a neat envelope with directions.

What a difference Touch-A-Matic made on my ZX81. I've encouraged group members to purchase Touch-A- Matic, and I'm happy to say we're pleased with this fine product.

Michael Wilson, ZX Users of America, New York

When loading a program from tape is complete, my computer bombs out. I played around with my tape and found a recording flaw. Is there some way of entering a fake END statement so the ZX/TS thinks that it has the whole program?

I have a long program that I don't want to retype. The computer takes 90% of it before it bombs out. Would it work if I hit break before the flaw and enter END? I don't know machine code well enough to try it.

John Broussard, Tucson, AZ

I don't know how to enter an END statement to solve this problem. But, with a ZX-99 Tape Controller (Sept. 82) you could read material in, edit it, re-record it and load the edited version. Check with the Phoenix user's group, 602/846-2882; Randy Saxton. — KO

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BEHIND EVERY GOOD SINCLAIR IS A MEMOPAK

If you own a Timex-Sinclair 1000 or ZX81 computer, you should have a Memopak behind it. From increased memory to high resolution graphics, Memotech has a Memopak to boost your system’s capabilities. Every Memopak peripheral comes in a black anodised aluminum case and is designed to fit together in “piggy back” fashion to enable you to continue to add on and still keep an integrated system look.

High Resolution Graphics

Order at no risk

All Memotech products carry our 10 day money back guarantee. If you’re not completely satisfied, return it in ten days and we will give you a full refund.

And every Memotech product comes with a six month warranty. Should anything be defective with your Memopak, return it to us and we will repair or replace it free of charge. Dealer inquiries welcome. Tb order any Memotech product call our toll-free number 800/662-0949 or use the order coupon.

snmo Teen

CORPORATION

7550 West Yale Avenue Denver, Colorado 80227 (303) 986-1516 TWX 910-320-2917

1 64K RAM	117995
J 32 K RAM	10995
1 I6KRAM	5995
Centronics Parallel Printer Interface	104.95
1 RS232 Printer Interface	13995
* High Resolution Graphics	144.95
I Shipping and handling	4.95		*4 95 1
, * All prices quoted in U S dollars		Tkx**
. ** Colorado residents please add sales tax J □ Check □MasterCard □ Visa		fetal
' Account No		Exo. _
1 I l 1
! Name 1
I Addrot 1 ! i
'City l__ _ _ _		State	Zip 1

Memopak 64K RAM The 64K RAM extends the memory of your Sinclair by 56K to a full 64K. It is directly addressable, user transparent, is neither switched nor paged and accepts such basic command as 10 DIM A (9000). The Memopak 64K turns your Sinclair into a powerful computer suitable for business, recreational and educational use. No additional power supply is required.

Memopak 32K RAM The 32K RAM Memopak offers your Sinclair a full 32K of directly addressable RAM. Like the 64K Memopak, it is neither switched nor paged and enables you to execute sophisticated programs and store large data bases. It is also roily compatible with Sinclair’s or Memotech’s 16K RAM to give you a full 48K of RAM.

Memopak 16K RAM The Memopak 16K RAM provides an economical way to increase the capabilities of your Sinclair. And at the same time, it enables you to continue to add on other features with its "piggy back” connectors. It is compatible with the Sinclair 16K or a second Memopak 16K or Memopak 32K to give 32K or 48K of RAM respectively.

Memopak High Resolution Graphics The Memopak HRG contains a 2K EPROM monitor and is fully programmable for high resolution graphics. The HRG provides for up to 192 by 248 pixel resolution.

Memopak Printer Interface The memotech centronics parallel or RS232 printer interface paks enable your Sinclair to use a wide range of compatible printers (major manufacturers’ printers available through Memotech at significant savings). The resident software in the units gives the ASCII set of characters. Both Memopak printer interfaces provide lower case character capabilities. The RS232 Interface is also compatible with modems.

New products coming soon Memotech will soon be introducing four new Sinclair compatible products: a high quality, direct connection keyboard, a digitizing tablet, a 16K EPROM and a disk drive. Watch for our future advertisements.

r

i

it

&

i

j

i

MEMOTECH INTRODUCES THE ZX81/TS-1000 KEYBOARD

The Memotech keyboard is a high quality standard (typewriter) keyboard, with Sinclair legends. The keyboard is housed in a well engineered and elegant aluminium enclosure. It is cable connected to the accompanying buffered interface which is housed in a Memopak case and plugs directly onto the back of the computer. As with other Memotech products, the piggy-back tradi¬ tion is maintained, allowing other add-ons to be plugged onto the back of the interface.

Priced at $99.95 (Plus $4.95 for shipping and handling).

THE FOLLOWING PRINTERS ARE ALSO AVAILABLE THROUGH MEMOTECH

SEIKOSHA GP 100

The Seikosha GP 100 uses a 5x7 dot matrix printing format with ASCII standard upper and lower case character set. Printing speed is 30 characters/second with a maximum width of 80 characters. Character spacing is 10 characters/inch with line spacing of 6 lines/inch or 9 lines/inch. The printer uses standard fanfold paper up to 9i inches wide. The GP 100 utilizes a standard parallel interface (Centronics compatible).

Priced at $399JOO including Centronics parallel interface & cable. (Plus $9.95 for shipping and handling).

SEIKOSHA GP 250

The GP 250 is also manufactured by Seikosha, the leading company of the Seiko group It uses a 5x8 dot matrix printing format with ASCII standard upper and lower case character set. Printing speed is 50 characters/second with a maximum width of 80 characters. Character spacing is 10 characters/inch. The GP 250 also uses paper up to 9£ inches wide. This printer utilizes either standard parallel Centronics interface or serial (RS232, DIN connector) interface.

Priced at $449 jOO including Centronics parallel interface & cable. (Plus $9.95 for shipping and handling).

PROWRITER 8510

The Prowriter 8510 is a Leading Edge product. It uses a 7x9 dot matrix printing format with ASCII standard upper and lower case character set. The printing speed on the 8510 is 120 characters/second with a maximum width of 80 characters. The 8510 utilizes a standard Centronics parallel interface.

Priced at $649 .00 including Centronics parallel interface & cable. (Plus $9.95 for shipping and handling).

To order any of the above items, call Toll Free 1 800 662 0949 or write:

MEMOTECH CORPORATION

7550 W. Yale Avenue, #200 Denver, CO 80227

i

BOOK REVIEW

Title:

Author : Publisher :

Price:

Mastering Machine Code on Your ZX81 Toni Baker

Reston Publishing Co. c/o Prentice-Hall, Book Distribution Center, Route 59 at Brook Hill Dr., W. Nyack, NY 10995 $12.95

Many things bother me about Toni Baker's book. But, this book is invaluable if you want to expand your programming potential and stretch your ZX/TS to its limits.

If you're disenchanted with sluggish ZX/TS graphics or limited number of BASIC commands, then you're ready to move into machine language. Baker's book gives you an easy intro to machine code and focuses on your ZX/TS computer rather than the Z80 microprocessor.

Toni Baker's book is written for ZX/TS users who know BASIC but

A ZX-81 breakthrough!

The CAI/ESF mass storage device

• Load or store 27K bytes in less than 30 seconds.

• Your existing cassette-stored pro¬ grams transfer easily.

• Menu-driven, access by keyboard command.

• Second drive easily added for greater flexibility.

• For T/S 1000, ZX-81 and ZX-80.

$119.95*

• Requires CAI/O Board for interface $69.95

Order by phone or mail. Check, money order, VISA or MasterCard (include number and exp. date). Post, in U.S. $5

CAI Instruments

PO Box 2032, Midland, Ml 48640

517-687-7343

have no background in machine lan¬ guage. She begins with an elemen¬ tary explanation of hexadecimal math and ends by disassembling the ZX81 ROM. She occasionally pauses to patiently explain instructions and routines. She also illustrates more difficult concepts by using them in such programs as Life, Spirals and Draughts. Baker also includes a program that lets your ZX/TS generate two whole octaves of musical notes. In my opinion, this program alone makes Mastering Machine Code worth its price.

Toni Baker's writing, or more correctly, teaching style is infor¬ mal, almost chatty. She encourages you to experiment and modify pro¬ grams to reinforce newly acquired skills. Although Baker's Mastering Machine Code progresses slowly, it encourages you to think through each process before going on. The end results are faster execution of your programs and better use of your machine's memory.

I found several aspects of the book disappointing. It wasn't un¬ til Chapter 2 that I realized that Mastering Machine Code was written for both ZX81s and ZX80S. What a surprise! No mention is made of ZX80S in the title, introduction or back cover blurb. Interruptions in narrative to explain "old ROM" and "new ROM" differences should be mentioned earlier on.

It is painfully obvious that Mastering Machine Code is some kind of photo reproduction of typed manuscript pages. For the $12.95 price I feel entitled to a properly proofread, typeset book. I also found local British idioms to be disconcerting — and in places they obscure Baker's meaning.

Mastering Machine Code covers a difficult subject, but if you de¬ vote some time to your ZX/TS com¬ puter and Toni Baker's book you'll end up speaking a language other than BASIC.

John Connell Jr., Middletown, RI

i

I

#

i

14

i

M Touch - A - Mat ic ”, Power At Your Finger Tips!

KOPAK'S TOUCH-A-MATIC™ gives you the power to type more accurately and much faster. It requires no wires, no soldering. Comes with complete instructions. It's as easy as removing adhesive backing and pressing into position. Positioning is easy. Once in position, you are ready for touch¬ typing with ease.

Our unique vinyl-key-hold creation will guide your fingers to the correct keys. Finally, touch-typing now possible with your Sinclair* or Micro-Ace*.

This remarkable product, as well as other KOPAK items, are now available. Call now to order through MC/Visa or send check/M. 0. to Kopak Creations, Inc.

TM Trademark of KOPAK Creations, Inc.

Sinclair* is a trademark of Sinclair* Research LTD.

MicroAce* is a trademark of MicroAce*

$1.50 Handling Charge

KOPAK CREATIONS, INC. (212) 757-8698

Master Charge & Visa Accepted

KOPAK Creations, Inc. Dept.SXI P.O. Box 1076, New York, NY 10019 (212)757-8698

HARDWARE TIP — KEYBOARD CONVERSION

If you plan to try the keyboard conversion shown in SQ (premier issue. Winter 82), try using a 16- pin DIP socket (wire wrap), cut in half for plugging your keyboard cable into your ZX board. Use this simple plug as a connector to any keyboard or joystick. (For a photo of the board, see SQ Winter or the chapter entitled "How the Computer Works" in the ZX/TS manuals.)

You don't need to remove 5- and 8-pin connectors shown in fig¬ ure 3 (SQ Winter 82, p.28). After going to the trouble of saving the double-sided tape when you opened your case, it seems silly to void your warranty and physically modify your ZX/TS when you can use a $.50 part for a connector.

Original keyboard connector sockets have pins on 0.010" cen¬ ters. This is standard DIP (dual in-line pin) socket spacing. Get a 16-pin DIP socket (preferably

wire-wrap type) and cut connecting bridges to create two 8-pin single- in-line packages (SIP). Strip the 5- and 8-wire cables from your new keyboard and plug them into appro¬ priate pin holes on each SIP (dis¬ regard or remove the extra three slots on one SIP), then solder in place. Cut the long wire-wrap pins off to about 1/4" and insert in ZX/TS sockets.

Paul Donnelly III, Centerport, NY

Discard

MELBOURNE HOUSE SOFTWARE

"THIS BOOK SHOWS JUST HOW MUCH CAN BE CRAMMED INTO SINCLAIR/TIMEX'S TINY RAM CHIPS!" &

Orders to: MELBOURNE HOUSE SOFTWARE

Dept. CS 347 Reedwood Drive, Nashville, TN 37217

Dealer orders and queries: 800/251-5900 (ask for a Melbourne House operator)

Visa and M/C orders

can be phoned in. 615/361-3738

BOOKS:

□ 25895 The Complete Basic Course $34.50

□ 25957 Machine Language Programming

Made Simple $14.95

□ 20922 The Complete Tlmex/Sinclalr

ROM Disassembly $1 9.95

□ 26025 Not Only 30 Programs $9.95

□ 25913 Understanding Your 2X81 ROM $14.95

TAPES:

13941 Gamestapel:llPrograms-lK $14.95

13942 Gamestape2:3Games-l6K $14.95

13943 Gamestape 3: Catacombs

Adventure-16K $14.95

13944 Gamestape 4: 3D Monster Maze-16K $14.95

13945 Gamestape 5: 3D Orbiter-16K $14.95

26446 Space Trek -16K $14.95

26359 Super invasion -IK $14.95

26318 wail Busters-lk $14.95

26472 10 Exciting Programs-lK i $14.95 26284 Reversi-IK $14.95

1 26406 Toolbox -IK $14.95

] 26490 Basic Course 2 cassette pack $7.50

] 14026 Combat Flight-16K $14.95

TOTAL: $ _

Residents of CA,MD,TN,

please add sales taxes: _

Add $2 for Shipping & Handling,

foreign orders add $6: _

Enclosed is my check or money order for $

TOTAL: $ _

Please charge my Visa or r MasterCard Card# _ expiration date

Signature _ Name _

STX2

Address

City

SINCLAIR

ZX81

HARDWARE REVIEW

Product: JK Audio Model JK-310 I/O Board with Real Time Clock

From: JK Audio, P.0. Box 3295, Escondido, CA 92050-0580 Price: $59.95 (assembled and

tested) plus $3.95 (P&H)

JK-310 is ideal for your appli¬ cations and projects that require a real-time clock.

JK-310 uses an OKI semiconduc¬ tor MSM5832 real-time clock chip.

It runs independently of your computer and is addressed directly from software when needed. Battery backup is provided for, so you just program the day, date and time once and forget it.

JK-310 is an impressive piece of hardware. It has its own 5-volt regulator and an interesting multi¬ plexing scheme. It runs four memo¬ ry locations into both the clock read and write ports and up to eight 8-bit inputs or outputs. It comes set-up with edge connector access to control port for further multiplexing, clock, one buffered 8-bit input port, a buffered 8-bit output port, and direct access to the data bus. JK-310's standard ZX bus connector is compatible with RAM packs, etc. The package uses four memory locations, 16380-3.

MSM5832, running with a 32 kHz clock, keeps automatic track of seconds, minutes, hours, day and date, month, year and even leap year. It is accessed by a POKE which tells the hardware which digit you want to know and a PEEK which looks at the digit. JK provides BASIC software (using 2K RAM or less) to get time data and then print it out.

Both clock and I/O ports use 74LS374 & 74LS139 logic chips to decode 4 memory locations into various port configurations and simulate more expensive peripheral I/F adapter chips. This decoding scheme brings 6 more I/O control

lines to the 44-pin edge connector.

On the negative side, output ports can only sink about 40 mA, which isn't enough for common 5V relays. This means another power supply would be required. For example, if you have another trans¬ former, a 24 volt relay would be sufficient for 40Ma. (JK Audio says Radio Shacks DPDT with 12VDC coil, #273-213, works fine. — Ed) JK-310 is professionally de¬ signed mechanically and electri¬ cally. Complete schematic and data on the OKI time chip is provided. Documentation, however, is sparse and hard to follow. You'll also need 3 NiCad AA batteries. Check the supplied battery holder polar¬ ity; mine was backwards.

JK-310 is a powerful ZX/TS addition. With simple interface circuits (schematics provided), you can use it for many applications where exact time is important.

Paul Donnelly III, Centerport, NY

Sinrlair

Computing

Not just another newsletter, Sinclair Computing is a typeset magazine with color illustrations, published monthly. If you own a Sinclair or Timex/Sinclair Computer you need Sinclair Computing. Every issue is packed with informative Articles, New Products, Users Groups, News Bits, Letters, Ask Sinclair Corp., Reviews, Tutorials, Hardware Projects (many for under $10), Programs, and Games.

FOR JUST $2.95 PER ISSUE

YOU CAN MAKE THE MOST OF YOUR SINCLAIR or TIMEX/SINCLAIR COMPUTER.

If after your first Issue you are not fully satisfied... cancel your subscription for a FULL, refund.

Sinrlair

Lomi

omputing

BOX 95- SC

Gtenmont New York 12077

Sinrlair

Ccmiputing

□ I want one year for just 836.

□ I want two years for just 865 Enclosed Is my check or money order

cmr _

STATE _

SXT-2

17

CHANGE YOUR

TIMEX/SINCLAIR 1000 DISPLAY TO FULL COLOUR GRAPHICS

with

KOLORWORKS

LOOK AT THE FEATURES ! ! !

* Plugs into ZX81/1000 (edge connector)

* All text will run on the color tv

* Module contains it's own memory

* User defined characters & graphics up to

256x192 pixels

* Latest technology with TMS9918 VDP

(32 sprite levels)

* Module contains extension of basic commands

including: PAPER/INK/BORDER/BIN/ SPRITE/OUT/INP / etc.

for $149.95

Use your KOLORWORKS immediately with a game cassette for $9.95

This delightful game is designed for hours of fun using some of the color graphic capabilities of KOLORWORKS. The cassette also contains a short program to familiarize you with some of the commands and graphics.

MOD TO USE HUNTER RAM WITH > 32K

Hunter tells us that their nonvolatile RAM board (reviewed in SQ, Winter 82) requires modifica¬ tion to work in systems with more than 32K conventional RAM.

Remove 74LS139 (IC5), bend pin 1 up and over pin 2 without con¬ tact. Buy a 74LS32 (available from Radio Shack) , bend pins 1 and 2 directly out, pin 3 out and under pin 2, pins 7 and 14 sideways, and cut off pins 4-6 and 8-13. Mount the 74LS32 on top of the 74LS139 with pin 1 above pin 1 and solder:

7.4, L.sm		74LS32
pin 16	to	pin 14
pin 8	to	pin 7
pin 1	to	pin 3
Solder 1" insulated	flying leads to
pins 1 and 2	of the	74LS32.
Reinsert	the two ICs into the

socket for IC5. Solder one lead to A15 and the other to MREQ on the edge connector. This completes decoding on the Hunter RAM board.

BOOK REVIEW

MAIL TO:

BRAINCHILD COMPUTER WORKS, INC.

P.O. Box 506 Pewaukee, Wl 53072

Price + Qty. _ Amount

KOLORWORKS	$149.95
CASSETTE	9.95
Shipping and Handling	4.95	$4.95
Wi. Res. add Sales Tax
My D check D money order enclosed	TOTAL

Name

Street

City State Zip

Please allow six to eight weeks for processing. Thank you.

For further information - Send $2.00 (credited to order) WATCH FOR:

"GAAMWORKS" -

Joystick Ports / Sound / Cartridge Slot

Title: Explosive Games for

the ZX81

By: Tim Hartnell

From: Reston Publishing Co. , Inc.

c/o Prentice-Hall Inc., Book Distribution Center, Route 59 at Brook Hill Dr., W. Nyack, NY 10995 Price: $10.95

(softcover, 140 pp.)

Any ZX/TS owner with children or a limited budget for commercial game software will want a copy of this book. Tim Hartnell covers a wide range of games providing some¬ thing for everyone.

4 9 Explosive Games is a dual purpose book. The book's program listings are also intended to broaden your programming skills. Hartnell says, "We've tried to en¬ sure that each and every program contains at least one programming technique which you'll adapt for

18

your own programs."

Hartnell lists games of all imaginable types: mazes, adven¬ tures, racing and landing games, and of course alien blast games.

He includes Life, Draughts (Chec¬ kers), and several unique pattern generators. In some games you are pitted against the logic of your computer? in others your foe is the insidious random number generator.

Hartnell's book gives many hours of good fun in both playing and programming "49 explosive games." He is not overly concerned with authorship pride. He invites you to enjoy "...working with them, altering them. ..deleting some sec¬ tions, improving others, and so on, until the game carries your person¬ al stamp." In many cases he offers hints on potential game improve¬ ments or ZX81 to ZX80 conversions.

When you consider the per game cost is something less than 25 cents, you get a real bargain with this book. Another bonus: IK and 16K games come with directions on how to play them and programming techniques used. ZX80 owners will find 28 games for their machine.

One fault with 49 Explosive Games lies in its visual presenta¬ tion. About two-thirds of program listings are apparently reproduced directly from ZX/TS printers. This may build confidence that programs are correctly listed and really run, but it detracts from program readability. Fortunately, Hartnell foresaw this problem and repeats troublesome keystroke patterns. Inverse graphic and alphanumeric characters suffer the most from this treatment.

I strongly recommend this book to any new ZX/TS owner and to users who have children beginning to take interest in programming. Some ZX81 veterans will find this book inter¬ esting too, but many will have al¬ ready progressed beyond the scope of 49 Explosive Games.

CLASSIFIED ADS

You can reach almost 9,000 ZX80/81 and TS1000 users for just $9/line in SYNTAX classsified ads. Send your ad copy, typed 35 char./line (exactly as you want it to appear) with a check or money order (No CREDIT CARDS OR PHONE ORDERS, please) to arrive by the 15th of any month. Your ad will appear in the next month's issue. To repeat an ad, send another ad order with check by the 15th. We take no responsibility for advertisers. Include your telephone number, whether or not the number appears in ad copy. SYNTAX Classified Ads, RD 2, Box 457, Harvard, MA 01451.

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* Send $1.00 Refundable On First *

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STATES & CAPITALS*16K, DRAWS U.S., Quizzes State Name & Capital. Tape $10 Or For Info, SASE TorKIMTECH 1608 23RD AVE NE MPLS,MN. 55418

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DRIVE A VIDEO MONITOR WITH YOUR ZX-81. Our DVC-1 direct video kit is only $9.95. With the DVC-2 you can switch select normal or REVERSE VIDEO ; kit $20.45, fully assembled $31.45, installed $44.95, Get super sharp character definition with our 12" B&W video monitor ,$98. 45. Random Access, Box 41770S , Phoenix ,AZ 85080

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*

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*

DISCOUNT PRICES: dir. import 16K Rampak w/ edge connector 54+2 postage. Full size keyboard houses computer 72+3 MINDWARE printer 117 + 4 Q-SAVE 36 +2. full size printer 325 + 7 Write for low prices on EPSON, OKIDATA,AXIOM prin ters. 10-15% discount on all

software from SOFTSYNC ,DATA ASSETTE GLADSTONE and others. Ask about our disc drives and SPECTRUMS.

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*** QUALITY/AFFORDABLE SOFTWARE ***

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3. Escape, Snake & The Trap.... $8. 95

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MULTI-FUNCTION WINKY BOARD II**New SAVE filter cuts rampac "noise" for clean easy loading tapes. DUPLICATES any ZX/TS cassette. Solves LOAD problems AND MORE! Tiny lxl 1/2" open board interface needs no pwr no mod $24.PPD $18. kit US/Canada G. Russell RD1 Box 539 Centre Hall, PA 16828

KEY LOAD CASSETTE short ML program SAVEs those unLIST/unSAVEable cas¬ settes fr bkup 16K TS/ZX81 $10PPD G Russell RD1BX539 CentreHall PA16828

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21

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Feel center of keys for positive entry. No visual interference. Pressure sensitive attach quick & easy. Really works. $5.00 and SASE. L-P Overlays, 631 W. Main, Madison, In. 47250.

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- New Series Three Software -

Castles & Creatures III . 16.95

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Each program on cassette + manual 8KROM, 16KRAM. Please add $1.50 S&H $1 for cat. (Refunded with order.) N.J. add 6% tax. M.C. HOFFMAN CO., P.O. BOX 117, OAKLAND, N.J. 07436

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I/O BOARD _ PRINTER INTERFACE....

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//2K Programs from 2-BIT SOFTWARE// //Mind vs. Machine $9.95/ Free // //catalog games/educational soft-// //ware. 2-BIT SOFTWARE, Dept SY1,// //13674 Boquita , DelMar, CA 92014//

MARBLES > MAZES AND SINK HOLES A simple non-destructive game of skill and logic for all members of the family. 15 levels of play, from very easy to extremely difficult, each with 4 different screen types giving 60 full-screen displays. Score displayed as time taken. Auto clock enforces time limt? auto run and return to basic features. 100% machine code program for ZX81 or TS1000 with 16K RAM. Cassette $15, Mass residents add 750 sales tax. CHARLES DRURY, 40 WESTGATE RD #5, CHESTNUT HILL, MA 02167

LEARN DATA HANDLING TECHNIQUES with ZX Data Finder, a versatile file manager for 16K ZX81s. All routines thoroughly explained. Concepts and dozens of memory saving methods are analyzed. List/text $9.95-free info Tom Woods Box 64 Jefferson, NH 03583

* GAMES, BUSINESS AND EDUCATIONAL * Software For The ZX81 & T/S1000 For A Catalogue Send A SASE To: BRONZE STAR SOFTWARE PO BOX 265, CHICAGO RIDGE, IL 60415

ENHANCE YOUR ZX81-TS1000 SYSTEM Beautiful walnut/cherry cabinet Large keyboard, 6 dedicated keys Reliable ribbon/card connectors Improved heatsink and audiojacks Space inside for expansion boards More extras. SEND $1 & SPECS for detailed quote. "DO LOOPS" WORKSHOPS 209 Maple, Har leysville , PA 19438

***** ZX81 - TS/1000 SOFTWARE ***** ENTERTAINMENT - EDUCATION STRATEGY - MASTERCODE 16K 9.95

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ADVENTURE- BERMUDA SHORTZ 16K 14.95 REFERENCE- ZX81 POCKETBOOK 10.95 Add $1.50 Shipping For Each Item GAMES - TEXT ADVENTURES - BOOKS Send $1 P/H For Catalog & FREE Game SOFTWARE UNLIMITED PO BOX 147 GRANDVI EW , MO 64030

OUR POLICY ON CONTRIBUTED MATERIAL

NEW & UNIQUE IN CANADA INTEGRATED DATA SYSTEMS 11 Brighton Av Toronto Ont M4M 1P3 ZON-81 $61.60; Kayde 16KRAM,or4KROM 900 char graphics $75.60; Software 8/16K:$13.70ea Peckman,Murgatr oyds , Mugsy; $14.60 ea Tank Trap, Marine Rescue, Alien Invasion, Red Alert; Mazogs $27.90; ZX Chess II $29.30; Software from Orbyte; Home Budget, Home Inventory, Mega Mind, Salvo, $18.70 ea; Execusoft Series $128; from Timeworks; Star Battle, The Money Manager, The Electronic Check book, $23.48ea; Robbers of the Lost Tomb $20.71. Min ord $25 w/MO+$1.50 P&H. Outside Canada less 20% & send that amount as US$.Ont res +7% PST. Deliv 5wk ARO.Send for N/C CATALOG.

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! ADS IN ! ltrs/ figs 5 times larger!

! SYNTAX iCursor w/Edit Functions !

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Cassette w/instructions ! IT'S A ! Great window displays ! ! BABY !

Send check or m.o. today ! GIRL !

$7.95+$l S&H($2 out USA) ! - !

MT-SOFT, BOX 2638, Aurora, II. 60507

FREE! 2programs on tape. Write: Prog¬ rams, 3763 W. Crocus, Phx, Az 85023

SYNTAX invites you to express opinions related to any Sinclair computer or peripheral, or the newsletter. We will print, as space allows, letters discussing items of general interest. Of course, we reserve the right to edit letters to a suitable length and to refuse publication of any material.

We welcome program listings for all levels of expertise and written in either Sinclair BASIC or Z80 machine code. Programs can be for any fun or useful purpose. We will test run each one before publishing it, but we will not debug programs; please send only workable listings. Programs submitted on cassette can be tested more quickly and with less chance of error.

In return for your listing, we will pay you a token fee of $2.00 per program we use. This payment gives us the nonexclusive right to use that program in any form, world-wide. This means you can still use it, sell it, or give it away, and so can we.

We will consider submissions of news and hardware or software reviews. Please keep articles short (350-400 words). Again, we reserve the right to edit accepted articles to a suitable length. We will pay 7 cents per 6 characters, including spaces and punctuation, for accepted articles.

When you send in programs for possible publication in SYNTAX, please include the following information:

• How to operate the program, including what to input if it does not contain prompts.

• Whether you can run the program over again and how.

• How to exit the program.

• The Syntactic Sum (program published in Feb. 81 and Jun. 81; send SASE for a free copy).

• What RAM size program requires.

• What ROM program uses.

We pay for this explanatory text at the same rate as for articles in addition to payment for the program itself.

If you want us to return your original program listing or article, please include a self-addressed, stamped envelope. Otherwise, we cannot return submitted material.

SYNTAX is published

monthly by a wholly-owned subsidiary of The Harvard Group.

Syntax ZX80, Inc.

RD 2, Box 457, Harvard, MA 01451.

Telephone 617/456-3661.

12 issues, $29. Single issue, $4.

Publisher: Kirtland H. Olson Editor: Ann L. Zevnik Assistant Editor: Pamela Petrakos- Wilson

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23

SYNTAX

BUSINESS AND HOME SOFTWARE TAPES

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**** EXPERIENCE SINCE 1970 ****

**AS DESCRIBED IN DEC. '82 POPULAR** SCIENCE!!! THE SINCLAIR COMPUTER FAMILY SOURCEBOOK gives 100 pg. of detailed information about products for YOUR computer! Only $6.95 + $1.25 P+H. Send check or MO to ATLANTIC COMPUTER Box 936 Norfolk, VA 23501

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24

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