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  • The RF5c68 is an eight-channel sound chip developed by Ricoh. It was notably used in the Fujitsu FM Towns computer system, along with Sega's System 18 and System 32 arcade game system boards. The RF5c68 supports eight 8-bit PCM channels, with 19.6 kHz or variable sampling rate. Audio bit depth ranges from 8-bit to 10-bit.