Argh.
Well, After editing the file, and trying my available hard drives, I made little or no progress.
The program now reports the right geometry for each drive, but they are all mysteriously limited to one 24.78 - or some such MB partition. These are all LBA drives, bigger then the 1.37GB, or whatever that limitation was. I think that's the problem. I just ordered some older drives from eBay Hopefully, that will do the trick. The system is clean, professionally maintained and functions nicely, so I don't think it's a hardware issue. Unfortunately, I biffed the prehistoric Quantum hard-drive that came with the system because I firmed up a mounting screw that ended up cracking the PCB.
The good news is that I got the mother of all deals when I bought this system. THOUSANDS of disks, about half original, an ICD flicker fixer, the ICD AddRAM two external floppy drives, a nice monitor and stuff I have not even sorted through yet for 40 dollars from an old hacker type in town.
I'll be selling some of the original software on EBAY. Great stuff, lots of original games. Anyone know of a good, compatable accelerator for this system? I realize that the AdIDE is not compatable with A500 accelerators, so I might just scrap the whole thing in favor of a sidecar.