MAMEWorld Forums - EmuChat - Re: Diffrerences in Joust White/Green label vs others?

>Are there differences in these games (bug fixes, etc)?

As you mention, most likely specific bug fixes. Some of the source files in MAME source code might have the info pertaining to some of the specific sets. Going back to 1980s era, operators that register their cab purchase might get occasional company bulletin updates if wanting to upgrade the arcade game with a bug fix rom to replace a specific rom or an entire replacement pcb for replacing the old pcb. Atari and Midway would be notable companies that did this with their coinop bulletins being mailed to clients.

>Solid Red label
>White/Green label
>White/Red label

> And where is this mysterious "label" that they refer to? Was it on the main CPU board, etc?

The reference is actual stickers/labels that are adhered onto the program roms on a pcb.
On Williams games brand pcbs, the stickers would be in color instead of a revision number printed on the sticker/label.