@508?.ADF? (needs confirmation)
NEC SCSI PS CD-PS001A
J1 50-pin header
JP1 Unk Unpopulated
JP2 Unk, unpopulated
JP3 Bottom two pads shunted.
P1 DB25 port
P2 solder pads for 50 positions
RN1-3 Resistor Networks
U11 AMD DP8303N
U18 Chips P82C612
No oscillator, clock might be generated by Chips P82C612...
J1 outline hints at a previous
configuration of a right angle socket with retentive catches.
P1 has the solder pads for 50 positions,
while P1 is a DB25. Maybe there was a different external port?