I don't have 3.1 myself, so I can't say for sure how that would work. In my A2000 with 1.3 and 2.04 roms in the switcher, if I boot with the 1.3, it tries to boot but then gives an error due to the fact that I've installed Workbench 2.1 with the partition being formatted for FFS, which the 1.3 rom doesn't understand. If you have a floppy in DF0: though, it should boot from that instead, as it does in mine. Of course if you're running 3.1, then that's what you're probably wanting to switch to 1.3 for, in order to be able to run some of the older stuff easily.
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