The Didaktik Gama is one of the first Eastern European Sinclair clone, which was produced in Czechoslovakia. Its special feature was that it included an original Ferranti ULA chip, and 80 KB memory. (2 x 32 KB memory as well as 1 x 16 KB for the slower, graphics data and the video output).

It was produced in three versions: 

the Gama-87 in a black box,

the Gama-88 in a white box with several ZX Spectrum bug fixes,

and the Gama-89 further bug fixes and Cyrillic supported fonts.

All programs written for the ZX Spectrum could run on the Gama, too. A tape recorder could be connected as data storage.

Its manufacturing ceased in 1992.

Specifications:

Manufacturer:        Didaktik Skalica Ltd.( http://www.didaktik.sk/novy/)

Year:        1987

Processor:    U880D (Zilog Z80 clone), 3,5 MHz

Memory:    80 KB RAM, 16 KB ROM

Colours:        8 colours

Resolution:    256*192 (graphic mode)

Text mode:    32 columns 24 rows

Source:
Wikipédia
old-computers.net