> some boards are jumpered to use their ttys as 422 not 232 by
default, 
> did you check these settings?

I have no idea how to set that. However, just to make certain, I
hooked it up to my Psion, and I got output. It reports one processor
(TI make), and proceeds to POST. Then it hangs there, stating an
unsupported trap or something like that.
Let me type in the log.

SMCC SPARCstation 10/20 UP/MP POST version VRV3.43 (01/09/95)

CPU_#0 TI, STP1021APGA(2.x)       1Mb External cache
CPU_#1 ********** NOT installed **********
CPU_#2 ********** NOT installed **********
CPU_#3 ********** NOT installed **********


      >>>>>> Power On Self Test (POST) is running .... <<<<<<

ERROR: Unexpected Synchronous Trap Taken, Trap Type = 00000009

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