PPC-IOP UART

The PPC-IOP UART RX and TX are accessible through an unpopulated connector footprint located on the B side (underside) of the motherboard (together with the EE UART and some other signals). This connector footprint seems to be consistent across all 75K and later models. The PPC-IOP UART signals use 3.5V logic levels and the baud rate is 57600 bps. When powered on or reset the following message is sent:

D E C K A R D compiled $date

UART location on SCHP-75K (GH-040-??): nox_75K

UART location on SCHP-75K (GH-037-12): el_isra_75k

Photo credit: El Isra