The Alpha BK is a mass produced version of the famous Радио 86РК (Radio 86RK), an Intel 8080 (clone) based home brew computer detailed in “Radio“ magazine (in 1986):
Lots of info here - including a modern home brew version of the home brew Radio 86RK:
This machine has:
2 x КР580ВВ55А (KR580VV55A ... 8255 programmable peripheral interface)
2 x КС573РФ2 (KS573RF2 ... 2KB EPROM)
КР580ВГ75 (KR580VG75 ... 8257 programmable DMA controller)
КР580ВТ57 (KR580VT57 ... 8275 CRTC)
КР580ВМ80А (KR580VM80A ... 8080A CPU)