TK90X based on ZX Spectrum
The TK90X was a Brazilian ZX Spectrum clone made in 1985 by Microdigital Electrônica, a company from São Paulo, that had previously manufactured ZX80 (TK80, TK82) and ZX81 clones (TK82C, TK83 and TK85).Reported TK90X sales in October 1986 were 2500 machines per month.Export model
During that period, Brazilians were not allowed to import computers and therefore the TK90X became the first affordable color computer for Brazilians. It was successful in other Latin America countries, such as Uruguay and Argentina, but the export model used a different circuit board and schematics, and an original Ferranti ULA from the ZX Spectrum. 
Because of its affordability, many commercial software programs were locally developed for the first time for use of small businesses in Latin America to run on the TK90X and millions of users had their first computer experience with it.
There's an active user base of enthusiasts of this computer, with dedicated websites discussing software preservation, peripherals and homebrew development and modifications.