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After the TK80, TK82 and TK83 the TK85 was the last ZX-81 compatible machine Microdigital produced.

However it wasn't only a simple copy of the ZX-81 but featured several useful enhancements. Its rubber keyboard and case were similar to the Spectrum's and were much more pactical for intensive use. The 10 KB ROM held an improved version of the Sinclair's Basic with strings management and editing facility, as well as some primitive graphic commands.

Several additional routines allowed to record tape programs up to 4200 bits per second, manage a joystick interface and the built-in three-voice sound generator.

Thanks to the TK85, Microdigital started to lead the Brazilian home computer market, front of Sinclair and its US branch, Timex.

Thanks to Joao Roberto for most of the pictures and information.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


I Still have one with a thermal printer old K7 player and small black $ white tv.

Thursday 4th June 2015
Carlos Deabreu (usa)

It''s a really beautiful desing.
A cool clone of ZX81.

Sunday 2nd September 2012

This was my first computer!!!! My dad bought it for me when I turned 16 (I was living in Argentina at the time). I learned how to program in Basic on this little computer. Great memories! :)

Friday 3rd September 2010
Rey D (USA)


MANUFACTURER  Microdigital
TYPE  Home Computer
ORIGIN  Brazil
YEAR  1983
BUILT IN LANGUAGE  Improved version of the ZX81 Basic
KEYBOARD  40-key QWERTY rubber keyboard with up to 5 function per key
CPU  Zilog Z80 A
SPEED  3.25 MHz
RAM  16 KB up to 48 KB
ROM  10 KB
TEXT MODES  32 columns x 24 lines
GRAPHIC MODES  64 x 44 dots
COLORS  Monochrome
SIZE / WEIGHT  23 (W) x 14 (D) x 3 (H) cm / 500g
I/O PORTS  Expansion port, Tape-recorder, RF video out, Joystick
PERIPHERALS  Microdigital printer, all ZX81 peripherals
PRICE  Unknown

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