You should be able to see what key to press to enter the BIOS menu while the memory tests are runnung. On my machines (with Asus mobos) it is the Delete key.
Alex There are 10 kinds of people in the world: those who understand binary, and those who don't.
Well it seems the old Adaptec SCSI controller's BIOS will not allow booting from a CDROM. The Motherboard BIOS was designed back when 212 meg was a *huge* disk drive.
I've obtained a 'less obsolete' ATX formfactor box [don't know the CPU, but its likely much faster than the P133 in the other box]
Now all I need to do is scrounge some RAM [probably retail] then I should have a working x86 box - this one should boot from CDrom, sidestepping the original difficulty in generating a boot floppy from a .img file on a Mac