TheYMF292, akaSCSP (Saturn Custom Sound Processor) is a multi-functionsound chip developed byYamaha for theSega Saturn, and was also used inSega's arcade version of the Saturn, theST-V, along with theModel 2 andModel 3.
For sound generation, the SCSP contains 32 sound generators which can function in eitherFM synthesis orPCM digital audio mode. The sound generation hardware is then fed into theFH-1 128-step sound effectsDigital Signal Processor, which includes 16 sound effect presets. Finally each audio channel is mixed together, with fully configurable channel combining for various levels of FM generation complexity. This allowed the channels to modulate each other, in practice four generators were connected at a time but all 32 generators could be combined into one channel if desired. The SCSP also included a 7-levelinterrupt controller.
The SCSP is generally controlled via a dedicated external processor; in the case of Sega hardware, aMotorola 68EC000 is used. Also included alongside is aRAM chip for storing digital audio data and sound programming, and an externalDAC chip.
In comparison to the sound hardware in other video game systems of the time, the SCSP lacked any sort of hardware audio decompression.
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