[rescue] Ultra 1 boot from install CD fails

[vom513]

Apologies for asking the likely obvious - have you booted this machine with diag-switch and let it run through the tests ?

Since you have tried real CDs as well as ZuluSCSI virtual, it sounds like perhaps something that Solaris is “touching” that NetBSD is not ?

Have you actually tried to follow all the way through and install/run NetBSD ?

I guess a hail mary would be to start removing hardware and components one by one and try a Solaris boot after each step.

Sorry for the obvious things, just wanted to reply with what I would try.  

Please do let us know if you make progress or figure out the root cause.