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The TK85 was a ZX81 clone made by Microdigital Eletronica, a computer company located in Brazil. It came with 16 or 48 kB RAM, and had a ZX Spectrum–style case, more precisely a Timex Sinclair 1500 clone.
It had some special features like high speed (1500 bps) load and save, even mentioned in the user manual.
References
TK85 Wikipedia(Text) CC BY-SA