> The CPU is a Toshiba 4951 and looks to be a relatively standard MIPS III
> CPU.  The immediate worry is the Altera and Densan chips which will be

It's likely a tx49 for which we (Red Hat) have an ancient likely
bitrotted gcc port, if you're really interested I could probably clean
it up and submit it, but it'd be a really low priority :)

MIPS III would likely be a good default. You'll want to watch the dmult
and dmultu instructions since they have a different encoding on the
chip.

-eric