TK83

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]

TK83

Developer	Microdigital Eletrônica
Manufacturer	Microdigital Eletrônica
Type	Home computer
Release date	August 1982; 42 years ago (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]