The TK-82, of Microdigital Eletr鬾ica Ltda, was one of the first Brazilian home computer anyone could afford. It was a fairly close copy of the Sinclair ZX-80 albeit looking very similar to a Timex TS-1000, the US version of the ZX-81 which was also sold in Brazil.
It was the second computer made by Microdigital, after the TK-80, first attempt to produce a ZX-80 copy. The company will later produce clones of a variety of other popular computers such as the Sinclair Spectrum, Apple II and even Tandy TRS-80 Model III. Actually, Microdigital never produced computers of its own design.
However, the TK-82 wasn't a mere copy of the ZX-80 but featured several enhancements: two KB of RAM instead of one, a joystick interface, a tone generator and a dual tape transfer speed which could be either 300 or 4800 baud.
Three models were successively launched. The TK-82 with 4 KB of BASIC ROM, then the TK-82S with 8 KB of ROM, then the TK-83 which RAM memory could be expanded up to 64 KB. First models used standard logic chips. They were later replaced by one custom chip, probably copied from the Sinclair ULA.