The Mac Classic contains a complete System 6
installation in ROM that
you can boot from. Sorry but I don't have the docs handy, but I think
if you press Command-Option-Shift-X on startup, it'll boot from the
ROM. Another way that should work is Command-Option-Shift-Backspace --
Actually, the keys to press are:
Cmd-Option-X-O
That's the letter O, not the number zero.
-- Derek