Do you recognize these boards?

--- Patrick Rigney <patrick(a)evocative.com> wrote: The first two remind me of boards I've been given out of PBXs. The one marked '8" HDC' has connectors consistent with SMD drive cables (60-pin, plus 2 x 26 pin), and there were plenty of them at 8 inches and up (10" for a Fuji Eagle, IIRC; plus many at 14") The CPU board seems to have a two serials and a wide parallel port. That looks like "75188" below the connector marked "P3", a standard RS-232 transciever chip. The others in that area are probably the rest of the line drivers. The 6821 is a "PIA" chip, with two 8-bit parallel ports and several handshaking lines. Common in 6502 and 6809 designs. We had one on our early COMBOARD (MC68000) products. Looks like 22 DRAMs? ECC? The name "PX62" suggests to me that they are from a PBX. Dunno what bus that is, but the layout and the silk-screen remind me of Japanese boards, FWIW. No idea what the third one is. -ethan