TK83
ZX81 clone made by Microdigital Eletrônica in 1983
From Wikipedia, the free encyclopedia
The TK83 was a home computer produced by the Brazilian company Microdigital Eletrônica Ltda. and introduced in August 1982.[1][2][3][4][5] By December 1984, it was no longer being advertised by Microdigital, being discontinued in 1985.[6][7]
| |
| Developer | Microdigital Eletrônica |
|---|---|
| Manufacturer | Microdigital Eletrônica |
| Type | Home computer |
| Released | August 1982 |
| Operating system | 8K Sinclair BASIC |
| CPU | Z80A @ 3.25 MHz |
| Memory | 2 KB RAM and 8 KB of ROM |
| Removable storage | External Compact Cassette recorder at 300 bps |
| Display | Monochrome display on television; 24 lines × 32 characters or 64 × 48 pixels graphics mode |
| Graphics | TTL integrated circuits |
| Power | 9V DC |
| Backward compatibility | ZX81 |
| Predecessor | TK82C |
| Successor | TK85 |
The TK83 was a clone of the Sinclair ZX81,[8][5][9][10][11][12] and can for all practical purposes, be considered a version of the TK82C with repagged memory and including the SLOW function which permitted the video be shown during processing.[3]
General information
The TK83 had the Zilog Z80A processor running at 3.25 MHz, 2 KB RAM (expandable to 64 KB) and 8 KB of ROM that included the BASIC interpreter.[3][11][9]
The keyboard was made of layers of conductive (membrane) material and followed the Sinclair layout with 40 keys.
Video output was sent via a RF modulator to a TV set tuned at VHF channel 3, and featured black characters on a white background. The maximum resolution was 64 x 44 pixels, based on semigraphic characters useful for games and basic images (see ZX81 character set).
There was one expansion slot at the side of the machine, a cassette interface (data storage in tapes at 300 to 4200 baud,[5] with audio cables were supplied with the computer for connection with a regular tape recorder)[3] and a DIN joystick connector.[1]
