Rational/R1000s400/Random Technical Details
Power Supply interface
IOC schematic page 13, signal "PS0.ACPF~" is routed to J9 pin 3
J9 pin 1 which is the margin signal seems to originate from the RESHA board's pin 4, rather than IOC page 13, but our schematics show no circuitry for this.
Chipmarkings on board 10344
Label: DIPROC-01 0184 (A) Under label: P8752BH L2133764A 12.75 VPP INTEL(m)(c)1980
DESCRIPTION U/M REV PSY EPROM MICROCONT.-DIPROC, MEM32, CHECKSUM 0184 EA 01 REF DESIG: E46