Fairchild Chips id....

[kosmokrator]

what is this 2 Fairchilds near the Cpu? peripheral rom's???
Some Same white ceramic also on other board's .....

[gshv]

Those are probably 3851 or 3856 program storage units. They are mask programmable, which explains 95831-xx numbers (custom mask codes) on the chips. In addition to ROM, the PSUs also have some memory addressing logic, program and data counters, I/O ports, interrupt logic, and a timer. It was possible to use more than one PSU with a single 3850 ALU.

Gennadiy