Users Groups
DATAmerica Computer Users Group. Membership is free; publishes the DATAmerica Newletter for the cost of postage to your location. Exchange programs, ideas, etc. For Hardware and Software oriented people and most personal computer systems. Send U.S. postage stamp or 20 cents (International subscribers send U.S. funds sufficient for postage to their nation) to:
DATAmerica Computer Users Group
[address omitted]
New York, NY 10028
C.A.C.H.E., Inc. (Chicago Area Computer Hobbyist Exchange): 700 members; monthly newsletter; monthly meetings at DeVry Institute of Technology, Chicago Campus, 3rd Sunday of the month between 11 a.m. and 4 p.m.; membership: $10 annually.
Sinclair ZX S.I.G. (Special Interest Group) Send SASE for membership application to:
C.A.C.H.E., Inc.
Z80/Sinclair ZX S.I.G.
L. P. Weigel, Coordinator
Box C-176
323 S. Franklin, #804
Chicago, IL 60606
Club Nacional de Usuarios del ZX81. A Spanish users club founded in November 1981 with over 200 members. Bulletin issued 3 times annually; membership: 1.200,-ptas includes 4 consecutive issues of the bulletin. For information write:
Club Nacional de Usuarios del ZX81
[address omitted]
Barcelona, 14
Spain
RAM Expansion
Add on RAM for ZX80; 2K increments up to 16K. Complete schematic, parts list, sources, and how-to for $3.95. Appr. cost for 2K, $20; ea. additional, the cost of the chip; no additional power supply needed. Send $3.95 to:
Dennis Weber
PO Box 742
Troutman, NC 28166
For additional 1K RAM, plug in (as described in Syntax ZX80, order a Factory Prime HIT 6116-3 16K (2Kx8) CMOS RAM (150nS) for $14.50. Also available for 8K expansion, 2114L-2 (1Kx4) Static Rams (200nS) for $3.25 each or set of 16 for $48. $1.25 for shipping and postage. U.S. funds only. Order from:
Steven Streebing
Box 182
Washington, MI 48094
Monitor hookup
Direct video hookup schematic and directions for ZX80 and ZX81 from:
Heuristics
25 Shute Path
Newton, MA 02159
I/O Boards
3 port I/O P.C. board, 8255 PIA chip, 16K RAM connector, output connector, with extra board space for A/O converter, relays, clock chip, calculator chip, etc. P.C. Board wired, $45; add-ons extra. Software and specs included. Order from:
Professional Electronics
109 Chesney Lane
Columbia, SC 29209
RAMPORT, an integrated expansion system for the ZX81
Analogue and digital I/O ports and 16K RAM expansion on one card allowing long programs to be written for controlling motors, solenoids, etc. with appropriate interfacing. Write for details to:
Componedex Ltd.
P.O. Box 33
Leighton Buzzard LU7 7UX
Bedfordshire
United Kingdom
Cassette tape
Manufacturer of blank load magnetic tape cassettes and certified digital cassettes. Duplicators of High Speed Magnetic Tape. Custom manufacture and duplicate your products and programs. For details write:
Custom Cassette Cartridge Co.
6228 W. Oakton St.
Morton Grove, IL 60053
Games
Moving Billboard Billboard moves sideways from left to right. Display capacity is all of your RAM, 8K ROM only. $1.95 for list. Horse Race, 8K ROM $1.95. Both will run on 1K RAM. SASE for catalog of goodies to:
EZRA GROUP II
PO Box 5222
San Diego, CA 92105
Four games for the 4K ROM, 1K RAM ZX80, $5.00 to:
Aaron Andrews
PO Box 602
Chewelah, WA 99109
Adventure C; a space adventure game. Your space ship is caught by the graviton beam of an alien cruiser and you must escape. The hazards are great, but you have computer rooms, force shields, and lazer guns. £9
ZXCHESS II for the ZX81; Written entirely in machine code; 16K RAM; 7 levels; graphics display of entire board. The computer will even recommend a move for you if you want. £15
Artic Computing
396 James Reckitt Avenue
Hull, North Humberside
United Kingdom
In U.S.
Softsync, Inc.
PO Box 480
Murray Hill Station
New York, NY 10156
And
Gladstone Electronics
901 Fuhrmann Blvd.
Buffalo, NY 14203
Software Publishers
Dutch/German scientific and software publishers want to publish and sell your software for the ZX80/81 1K-16K on the European continent. Licenses for already published materials. For details write to:
WISSENSCHAFTLICHE EDITION
H. J. Lehmann
van Teylingenlaan 10
1701 AB Heerhugowaard
The Netherlands