Thanks for the info, Dan. Perhaps this means that the hard disk just gave up the ghost. i recently powered up the 3000 after it had been in storage for close to 20 years-- the hard disk worked fine for the first day, then the second it was no longer visible to the system-- I also noticed that the battery was hosed about this time.
On a positive note, the A2500 is alive! Moving the accelerator board to a different slot seemed to do the trick. All seems to be well except for the SCSI card or disks, but that's a story for a different thread...
I conclusion, I can confirm TjLaZer that the 1.3.3 disks with the 3000 work with the 2500.:-)