Bally 2518-51 Sound board U4 ROMs

This series of games uses the 2518-51 series sound board which, while better than the early board which only made tones, is a far cry from the 'Squalk & Talk' board introduced later. The 2518-51 board can be identified by the single SOUND ROM which is labeled U4. This board has a single pushbutton which causes the board to 'self-test' and play either a tone or a series of sounds. Pushing the test button with some SOUND ROMs will make the board beep only once. Other ROMs will repeat the test sound. Still others do not respond to the test button. This does not mean the board won't work when the MPU sends signal to them during normal game play.

BallyU4s

Pinball ROMs

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ROMs

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