More a query than a problem:
I used to be able to boot the ROM disk in my Macintosh Classic with the usual CMND+OPT+X+O key combo on boot. Now, strangely, this key combo only sort of works. Instead of booting into System 6, it will boot off the HDD into System 7, but the 'Boot Disk' will appear on the desktop! Sometimes I can open this, other times it comes up with a 127 error.
If I do manage to open the ROM Disk and use the Startup Selector to select the ROM Disk, I can boot into the ROM Disk without using the key combination.