Rick Kelly writes:
> The Sun Sparc Classic X is a complete Sparcstation Classic except that
> the boot prom can only see le0.  The prom can't see the SCSI or serial
> ports.  However, installation of a standard Classic rom will make it
> whole again.

 According to the Sun hardware faq, the SPARCclassic X also accepts
1mb and 2mb 60ns simms in addition to 4mb and 16mb, whereas a plain 
SPARCclassic only accepts 4mb and 16mb. That part apparently comes
from the 12/15/93 Field Engineer manual. Otherwise it seems to be the
same as an ordinary Classic.