TK80
ZX80 clone made by Microdigital Eletrônica in 1981
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The TK80 was a home computer produced by Microdigital Eletrônica.[1][2][3][4] A clone of the Sinclair ZX80,[5][6][7] it was introduced along with the TK82 in 1981 during the "I Feira Internacional de Informática". There were two versions, one with 1 KB RAM costing Cr$ 68,850 and another with 2 KB costing Cr$73,650.
| Manufacturer | Microdigital Eletrônica |
|---|---|
| Type | Home computer |
| Released | Brazil: 1981 |
| Introductory price | Cr$ 68,850 (1KB RAM), Cr$ 73,650 (2KB RAM) |
| Media | Cassette tape |
| Operating system | 4K BASIC |
| CPU | Z80A @ 3.25 MHz |
| Memory | 1 or 2 KB |
| Display | Monochrome TV out; 24 lines × 32 characters or 64 × 48 block graphics mode |
| Backward compatibility | ZX80 |
| Successor | TK82 |
In the January 1982 issue of Micro Sistemas magazine, Tomas Roberto Kovari, Microdigital's engineer, stated that the machines were being sold with a photocopied manual, while a printed version was being developed.[8] Kovari estimated a potential market for 10000 machines in Brazil, with expected buyers being novelty seekers, students and self employed professionals.[8]
According to some sources, the TK80 was never commercially produced, with only prototypes existing.[2][9][10]
Specifications
Specifications were similar to the original machine:
- CPU: Z80A @ 3.25 MHz
- Memory: ROM: 4 KiB; RAM: 1 or 2 KiB
- Keyboard: 40 keys membrane keyboard
- Display: 32 × 22 text; 64 × 44 semigraphics
- Expansion: 1 slot
- Outputs: 1 TV out (RF modulator, channel 3); cassette tape recorder audio in/out
- Storage: Cassette tape (300 bauds)