Hey all. Can anyone ID what game this board is for? SSU-4 Sound Board. Cant seem to find any info on it. Thanks!

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Found it. It is a sound board for Super Nova. Info was in another thread....

SSU-4

By the next upright game, Super Nova, which was released in the early part of 1980, Game Plan realized one of the things its machines were missing was background sound (remember Flash had already been out for over a year by this time.) Extending the design of the SSU, a fourth 76477 sound generator chip was added to the board to provide background sound. The SSU-4 has a jumper on it that selects whether or not to enable background sound and you’ll note this in the SSU4 schematic where one of the sound generators is labeled “CONSOUND” for “continuous sound”. A picture of a SSU-4 with the jumper set for continuous sound can be found here:

http://peakpinball.com/.../uploads/2014/07/IMG_0739-Edit.jpg

With the SSU-4, Game Plan reduced the number of chime sounds produced by the board to three since it needed some of the lines on the 74154 to control the background sound, added the ability to turn the background sound on or off depending upon the game state, and while it kept the explosion, warble and howl effects, swapped in effects for a siren, twang and spark.

After the SSU-4, Game Plan had pushed the architecture to its limits and if it wanted better sounding machines, it needed to move to microprocessor controlled sound, which it did with its next game, Pinball Lizard.