You may have to solve the problem with separate physical disk drives, or at least prove something with that arrangement.

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I'll just wipe the 7.6 drive, it's entirely backed up. As an aside, is it possible to boot from a Zip disk? Could I use removable, Zip media to boot into 7.5.x? That would be much more convenient.

What is the need for 7.6?

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I'm trying to remember... I think it's required for Shareway IP, something about Open Transport.

Update: I wiped 7.6, and now the machine can boot with 24-bit memory addressing. So, this is a tough call: should I keep using 7.6 and search for the problem, or give up 7.6 and update 7.5.x to 7.5.5? Does anyone else here use OS 7.6? Is it important for any reason?