>> Oh, Simon, I think
>> I found the way to distinguish DECsystem 5900 from 2{4,6}0.
>
> And?  :-) :-)

Do you have any chance to check a certain bit (0x8000) of IOASIC INTR
register on 2{4,6}0 and DECsystem5900 after boot?

Tohru Nishimura
Information Technology Centre
Nara Institute of Science and Technology