david__schmidt said:

.IMG isn't any kind of standard, so it's hard to tell if it would be supported or not.  But my guess is it probably is.  One thing isn't clear to me yet: are you specifically booting a floppy (PR#5) vs. just letting the system boot from the Zip disk - which I assume is in slot 7 - which probably doesn't have PRODOS.SYSTEM copied to it yet?

It's just an unlucky turn of events that disks without a PRODOS.SYSTEM on them are the ones you can't create.  That's all you really need in order to make a disk bootable.  (Of course, you also have to know exactly which disk/slot is actually being booted, as noted above...)

Click to expand...

Sorry for any confusion. I have also tried to boot the floppy disks without the Zip drive connected. So I took that out of the equation. The Zip disk has been formatted into 4 (32MB) ProDos partitions, but is currently blank. The goal is to eventually install GS/OS on there.

Therefore there is either a problem with the disk images I'm using, or the way they are being written. I found the archive of older Apple downloads, so I'm going to download those files (they are in sea.bin format), and see if I have better luck from those.

I'll report back tonight with an update. If all else fails I did get the GS to boot via ADT, but at the time I didn't have enough RAM for GS/OS, thus it failed to install.