Proprietary International
Owner(s): Steve Zwaska, Randy Wear
131 LaSalle Rd., Streamwood, IL 60103
Products
| Name | Description | Computers |
|---|---|---|
| ZT21000 | Expansion unit for ZX81/TS 1000. Promised 64-key auto-repeat big keyboard, 15 colors, 32K RAM onboard, 3 kinds of sound, 33 new BASIC commands, multiple statement and input lines, 6 video pages, high resolution (256×192 pixels) and animation capabilities, user-definable characters and character sets and up to 9 user-definable functions. RS232 and parallel interfaces, two Atari-compatible | Sinclair ZX81, Timex/Sinclair 1000 |
Articles
| Title | Description | Computers |
|---|---|---|
| Proprietary International Announces ZT21000 | Details of their new co-processor for ZX/TS computers, the ZT21000. | Timex/Sinclair 1000 |
| Vendor Report | Updates from/about Proprietary International, Norris Electronics, SMUG, Gladstone Electronics. | |
| Wanted: Assembly Language Programmers | Proprietary International needs assembly language programmers for their unreleased ZT21000. |