Article · Wikipedia archive · Last revised Jun 2, 2026

TK83

The TK83 was a home computer produced by the Brazilian company Microdigital Eletrônica Ltda. and introduced in August 1982. By December 1984, it was no longer being advertised by Microdigital, being discontinued in 1985.

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Jun 2, 2026
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TK83
DeveloperMicrodigital Eletrônica
ManufacturerMicrodigital Eletrônica
TypeHome computer
ReleasedAugust 1982 (August 1982)
Operating system8K Sinclair BASIC
CPUZ80A @ 3.25 MHz
Memory2 KB RAM and 8 KB of ROM
Removable storageExternal Compact Cassette recorder at 300 bps
DisplayMonochrome display on television; 24 lines × 32 characters or 64 × 48 pixels graphics mode
GraphicsTTL integrated circuits
Power9V DC
Backward
compatibility		ZX81
PredecessorTK82C
SuccessorTK85

The TK83 was a home computer produced by the Brazilian company Microdigital Eletrônica Ltda. and introduced in August 1982.12345 By December 1984, it was no longer being advertised by Microdigital, being discontinued in 1985.67

The TK83 was a clone of the Sinclair ZX81,859101112 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.3119

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

References

References

  1. "Clube do TK90X". www.tk90x.com.br. Archived from the original on 2022-12-19. Retrieved 2024-02-16.
  2. "Os Pequenos Notáveis". Micro Sistemas. February 1984. pp. 32–40.
  3. "O microcomputador Microdigital TK-83 de 1983 – MCC - Museu Capixaba do Computador". museucapixaba.com.br (in Brazilian Portuguese). 2023-10-30. Retrieved 2024-02-16.
  4. "História Microdigital". microdigital-timeline.netlify.app. Retrieved 2024-02-16.
  5. "TK83". OLD-COMPUTERS.COM : The Museum. 2023-03-28. Archived from the original on 2023-03-28. Retrieved 2024-02-16.
  6. "Propaganda Microdigital". Micro Sistemas. December 1984. p. 24.
  7. "MV - Marcos Velasco Software". www.velasco.com.br. Retrieved 2024-02-16.
  8. "microdigital". microhobby.speccy.cz. Retrieved 2024-02-16.
  9. HURLEY, Linda (1984). Programas para jovens programadores : TK82-83-85 CP200 (PDF). São Paulo: McGraw-Hill.
  10. LIMA, Délio Santos (1983). Aplicações Sérias para TK85 e CP200. São José dos Campos, SP: J.A.C.
  11. PIAZZI, Pierluigi; ROSSINI, Flávio (1983). Basic TK. São Paulo: Moderna/Micromega.
  12. ROSSINI, Flávio (1983). Linguagem de Máquina para o TK (PDF). São Paulo: Moderna/Micromega.