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The voltages are +5V and approx +20V - the second voltage isn''t stabilized in power supply and may vary. Didaktik Gama stabilizes it to +12V used for video signal circuitry.
The memory chips are of various origin. I have seen bulgarian CM8164P, russian KR565RU5G (transcribed from cyrilics), or Samsung KM4164B. I wouldn''t be surprised to see czech MHB4164 in some variants.
The 16Kb memory chips are different to the ones used in ZX Spectrum. The chips used in Didaktik Gama need just one voltage, 5V. I have seen Fujitsu MB8118, or Intel D2118.

Hello Damian, it is 5V and 12V, not 24V.

Didaktik gamm power supply is +5v and +24v

Hello, I still have this cool machine and now I am working on a connection with a PC for sending a picture from Didaktik & showing it in a window on the PC. Nice time to U all!