Microdigital TK83

Brand: Microdigital Eletrônica Ltda
Model: TK83
Made in: Brazil
First year of production: 1983

This is a unlicensed ZX81 clone with 2K of memory. The 2 ROM chips stacked on top of each other are actually two 4K ROMs to make a total of 8K. It’s unknown if this was a factory modification or a user modification/repair.