TK90X [SEP] manufacturer
TK90X
The TK90X was the first Brazilian ZX Spectrum clone made in 1985 by Microdigital Electrônica, a company located in São Paulo, Brazil, that had manufactured some ZX81 clones (TK82C, TK83 and TK85) and ZX80 clones (TK80, TK82) before.
Technical details.
The case was a little higher than the original Spectrum and the keyboard placement was equal to the original keyboard, except for some additional commands that did not exist in the Spectrums (for characters defined by the user — UDG — in the
, with only digital logic ports and the analogue part outside the ULA chip, exactly as in the TK90X. It was reported that the TK95 provided more compatibility with the original ZX Spectrum (e.g., the game Mikie runs only on the TK95, not on the TK90X), e.g., the D1 diode was disconnected and some changes to the ROM were made. Curiously, some games became incompatible due to this modification. TK90X users in Brazil used to make a switch to choose the original TK90X (or TK95) ROM or the