Партнер-01.01 (Partner): Part 1 (A Soviet 8080-clone computer)
24Finally cracked this fellow open. It's a machine built in 1990 and looks to be quite well made with a magnetic reed-switch keyboard (more about that in a future video).
Incredibly easy to get into, to pull apart, clean and to service - keyboard, motherboard and PSU all unplug from each other.
Nice.
For now, just checking it over, converting the AC power plug and giving it a clean.
I did try energising it and checking the DC output under no load - I was expecting +/- 5V and +/- 12V but didn't register anything. The PSU does include a relay and so perhaps some load is required to turn the power supply on properly.
So I've given the top and bottom case a good scrub and will let them dry over night.
The machine has three 27C64A EPROMs and four cloned Intel chips:
КР580ВМ80А (KR580VM80A) = Intel 8080 clone
КР580ВВ55А (KR580VV55A) = Intel 8255 clone (PPI)
КР508ВТ57 (KR508VT57) = Intel 8257 clone (DMA controller)
КР580ВГ75 (KR580VG75) = Intel 8275 clone (CRTC)
On the left side it has a cassette port (МАГ), a video output (ТВ) and I assume a +5VDC output (+5В).
I'm not sure if it's an RF modulated video output or straight composite ... I'm thinking maybe straight (SECAM) composite signal, which would simplify things.
On the right side it looks to have a home-made joystick port - a DIN socket (surprise!) that is connected to the cursor keys on the keyboard.
More details about the Partner can be found here:
https://github.com/alemorf/retro_computers/tree/master/Partner_01_01
... or here (with OCR'd text):
https://archive.org/details/partner-01-01-documentation