Very interesting! I'd heard rumors of, but never seen, 7.1 on 800K floppies.

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Tom, do you mean specifically 7.1? Obviously since the Plus, SE & Mac II could all run up to 7.5.5 there would have been 800K versions of every system release and upgrade.

Was 7.1 special in some regard that it was not otherwise made available to those 800K only computers?

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7.5 was *NOT* available on 800K floppies. The Plus is the only system that can run 7.5 that was "guaranteed" to not have 1.4 MB drives, as the SE and II were available with both 800K and later with 1.4 MB drives; and both had 1.4 MB drives available as an upgrade after-the-fact.

The most common methods for installing 7.5 on a Plus were CD-ROM and network.