"ccraft@cncc.cc.co.us" wrote:

 ?  C  0080  0000.4001

Serial line controller.

??  B  0010  000C.0200

Memory problem

 ?  6  80A1  0000.4001

External SCSI bus: is it terminated.

??  1  00C0  0100.2004

Ethernet: is it connected to a correctly terminated network?

> MMU.  Anyone know what the numbers mean in the string: 
> "??  B  0010  000C.0200"?

Try TEST 50 and post the display from that. The manual lists various
possiblilities for TEST 50 but I don't see anywhere where it explicitly lists
the numbers for the poower-on tests, and the numbers you have don't match
anything I can find in the manual.

Antonio