My 8100/80AV Mac displays the following dialog box when I try to start it:
This startup disk will not work on this Macintosh model. Use the latest installer to update this disk for this model. (System 7.1 does not work on this model; you need a newer version that does.)
The only option, a "Restart" button, just brings me back to the same place.
I zapped the PRAM - no difference.
I tried a friend's Mac OS Version 7.6 CD-ROM - again, no difference.
My emergency startup floppy shows a "sad Mac."