The TK-2000 was a clone of the Apple IIc for its Electronics part; and a copy of the Atari 1200XL for the casing part.
For copyright reasons, Microdigital preferred to say that it was compatible with the Multitech MPF-II, an obscure Taiwanese computer which was somewhat compatible with the Apple II; but also added in its brochure that "a major part of Apple DOS software is compatible with the TK-2000" :-)
On top of Apple II features, the TK-2000 offered 64 KB of RAM, a sound generator, a PAL/M TV/RF modulator, a parallel printer connector and the ability to connect simulteneously two tape recorders. On the other hand, there were no expansion slots; which resulted in compatibility problems with Apple software that used original Apple hardware I/O.
Picture from http://cobit.mma.com.br. Thanks to Ericson Benjamim for his help.
Igor Morgado remembers:
Its good to remember on good feature in TK2000 that didn't exists in other apples. It has a internal assembly code interpreter, it could be called with LM command, with it the programmer could see the code of all basic programs in machine code.
Some adressing are different from Apple (as peek and poke basic commands).
Some tape instructions are different too.
I used a TK2000, and believe me: it is *not* an Apple IIc clone. For starters, it does not have a real text mode (text was drawn on the graphic string when the output ROM routine was called, and not when you wrote on the area reserved for text/low-res graphics on the Apple II). Software had to suffer slight modifications to run on it (and several software was modified, including games such as Gobbler and even DOS 3.3).
And copyright was not an issue, since Brazil on that time had a "market reserve", which allowed Brazilian computer manufactures to clone foreign machines at will, only being required to get approval from the government, which was routinely given (the only known exception being the Unitron Mac clone, but it was on a later period, when politics were under gradual changes here).