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Is this not viable for the IBM?
The "related link" (not easy to spot on that page) is: http://www.z80.eu/downloads/IBMPC-UCSD.zip
Interesting. It looks like those might be IBM's P-System (at least the boot disks), but they did not included any disk scans or label specific from the source disks, so I don't know if is really from IBM's distribution media or what revision level.
It would have been better if they had included the original imagedisk dumps. The P-system formatted disks I have come across so far use bizarre sector numbering and therefore could not be dumped as an "img". Any idea what forum they found the IMD files in?
Here are some details I posted about the IBM media set previously: https://forum.winworldpc.com/discussion/8732/ibm-ucsd-p-system-part-numbers