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Got it for next to nothing on ebay, but it lacked its pod cable.

Documents and links:

From the HP Computer Museum website:

  • The 4951A operation manual

  • The 4951C operation manual

  • The 4951A Service Manual

  • The 4951C Service Manual

Cable pinout

From the 4951C service manual (page 210), these are J2’s pin assignments on the device:

The information on the 18179A RS232 POD starts around page 350 in the service manual. The interface connector there is called J1 and it has the following assignments visible:

This seems to be a straight-through cable. Sadly enough the EXT test still fails with such a cable installed 8-/

The SCC seems the most likely problem. This is a Zilog Z8530CS according to the schematic diagram (page 217), A1U209.

Pictures

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