Users Groups
Central Pennsylvania Interest Group
Meets every Tuesday at 8:00 p.m. 321 Bouche Bldg., Penn State U. Campus, State College, PA. Initiator: Bill Russell. Phone: [phone number omitted].
Club ZX 80/81
[address omitted]
B – 1328 OHAIN
Belgium
SAM BAM (Sinclair and MicroAce Bay Area Microcomputer Users). Users “living in the Golden Triangle around Tampa Bay and along the golden suncoast of Florida” are invited to write for information. Locating users in the area is the immediate task.
SAM BAM
c/o Mel Routt
PO Box 596
Safety Harbor, FL 33572
Memphis, TN, ZX81 Users Group just getting started. Contact:
James Barker
[address omitted]
Memphis, TN 38111
Phone: [phone number omitted]
Voltage devices
VOTEM for ZX81/ZX80, 8K ROM.
Read voltage and temperature with extremely high sensitivity. Voltage range easily adjusted for wide variety of applications; temperature range: -25 to 125 C; self-contained and low power unit attaches directly to ZX80/81 with no hardware modifications; all calibration done in software; audio and visual tape load monitoring capability; circuitry for amplifying and conditioning tape signal. Software runs in 1K RAM. Kit, $39.95; assembled and tested, $59.95.
Down East Computers
PO Box 3096
Greenville, NC 27834
Protect all ZX80/81 ICs if voltage regulator fails by crowbar and fusing. Schematic, $2.00; with parts, $15.00. Schematic for precision setting of cassette output level, $2.00.
Arnold J. Gold
820 Prospect Ave.
Hartford, CT 06105
Books
Word Processors & Information Processing: A Basic Manual on What They Are and How To Buy, by Dan Poynter. $11.95 from:
Para Publishing
PO Box 4232-88
Santa Barbara, CA 93103-0232
Phone: (805) 968-7277
Memory Expansion
RKL-16K RAM, $79.95; expandable to 32K whenever desired. RKL-32K RAM, $149.95. Upgrade 16K to 32K, $79.95. Add $4.95 s&h and 5% tax in Mass.
RKL Systems
PO Box 515
Leominster, MA 01453
Joysticks
RKL-J1, single joystick system, $69.95; RKL-J2, dual joysticks, $89.95. Upgrades: RKL-U2, adds RKL-J1 to RKL-32, $59.95; RKL-U3 adds RKL-J2 to RKL-32, $79.95. Add $4.95 s&h and 5% tax in Mass.
RKL Systems
PO Box 515
Leominster, MA 01453
Publications
SYNCHRO-SETTE, a monthly magazine with bi-monthly cassette containing at least six programs for the ZX81 or ZX80(8K ROM) user. One year, $39.50. Visa and MC. For more information call 24 hr. toll-free hotline, 800/543-1300 (in Ohio, 800/582-1364), ask for operator 383.
S & S Company
388 W. Lake St.
Addison, IL 60101
Phone: 312/628-8955
Micro Moonlighter Newsletter will provide techniques, tips, and guidance to those who wish to make money with their computer knowledge. Among the topics: Marketing methods, advertising hints, the ins and outs of contracts, books. Subscriptions: $25 for 12 issues ($29 in Canada; $35 worldwide). Visa and Master Charge welcome. Send inquiries to:
J. Norman Goode
2115 Bernard Ave.
Nashville, TN 37212
ZX81 Sourcebook (TM)
A catalogue listing software and hardware for the ZX81. For information on getting listed and getting copies, contact:
Micro Design Concepts
PO Box 280
Carrollton, TX 75006
The Index covers over 40 magazines and newsletters in the home/personal computer marketplace and includes over 12,000 articles indexed by using the key words of the titles. For information and ordering contact:
Missouri Indexing, Inc.
P.O. Box 301
St. Ann, MO 63074
Phone: (314) 997-6470
ROM Disassembly
The ZX80 1K Disassembler for the 4K ROM ZX80.
The ZX81 1K Disassembler for the ZX81 and 8K ROM ZX80.
To begin disassembly of ROM or MC program, enter starting address, a key is calculated and displayed, manual then give mnemonic, all numbers displayed in decimal, about 100 bytes of RAM to store MC program for disassembly; RAM memory test provided; addresses of bytes failing the test are displayed. Manual, reference cards, and cassette with the disassembler and memory test programs. $9.95 pp. Further information and catalog upon request.
Lamo-Lem Laboratories
Box 2382
La Jolla, CA 92038-2382
Programs
8K ROM; 16K, 1K. Games, utilities, tech prog., household, and more. For details send SASE to:
NGM INC.
PO Box 18702
Okla City, OK 73154