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How do I know which ROM version I have?
The only reason to update the software in your pinball machine is if yours is currently out of date. If your game does not have the latest software revision, you may have software bugs in your game or you could be missing special features, settings or adjustments.
Almost all machines that have been built in recent years will show the software revision information in the display when you first turn them on. A lot of pinball machines also have a "test" or "diagnostics" button just inside the coin door. You should also look inside the backbox of your machine to see if the EPROMS are clearly identified by a sticker or writing on them.
Williams Pinballs (1977-1985):
The game's software revision is displayed in one of the displays when you enter "audit mode", through the buttons on the inside of coin door. The first number is the game production number, and the second is the software revision number.
Bally/Williams Pinballs (1990-1999):
Almost all of these machines will show the software revision information in the display when you first turn them on. The game's software revision can also be displayed through the buttons on the inside of the coin door. The game's sound revision is displayed several seconds after pressing the "ENTER" button inside the inside of coin door. Here are some examples:
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