Is it not possible to confirm what the machine is what based on the boot dialog?
If you want to confirm if a given compact Mac is an original 128k or 512k with 64k ROMs versus a 512ke (or ROM-upgraded 128k/512k), assuming it still boots, just flip the power switch and insert a working boot floppy. If it is an original Mac 128k or 512k with the 64k ROMs, the "Welcome to Macintosh" box will have a thick black shadow, offset to the right and bottom. But if the ROM is the newer 128k version (512ke / Plus / Upgraded), then the "Welcome to Macintosh" box will have a thin outline / border all around and then a slightly thicker outline within that (i.e., no "shadow"). This will remain true regardless of the System / Finder version you are booting from.
You can see this here:
Welcome to Macintosh boot box, new 128k ROMs - PHOTO
Welcome to Macintosh boot box, new 128k ROMs - VIDEO
When Googling this subject, it is simply amazing how little information comes up on this subject.
If you want to confirm if a given compact Mac is an original 128k or 512k with 64k ROMs versus a 512ke (or ROM-upgraded 128k/512k), assuming it still boots, just flip the power switch and insert a working boot floppy. If it is an original Mac 128k or 512k with the 64k ROMs, the "Welcome to Macintosh" box will have a thick black shadow, offset to the right and bottom. But if the ROM is the newer 128k version (512ke / Plus / Upgraded), then the "Welcome to Macintosh" box will have a thin outline / border all around and then a slightly thicker outline within that (i.e., no "shadow"). This will remain true regardless of the System / Finder version you are booting from.
You can see this here:
Welcome to Macintosh boot box, new 128k ROMs - PHOTO
Welcome to Macintosh boot box, new 128k ROMs - VIDEO
When Googling this subject, it is simply amazing how little information comes up on this subject.