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The Genny was loosely derived from Sega's 1985 "System 16" arcade board, and in arcades "68k for graphics and Z80 for sound" was nearly ubiquitous from the mid-80s through the early 90s. The SNES also has a second CPU for sound; their sound CPU and sound processor were designed for Nintendo by Sony's Ken Kutaragi, who later used beefed-up versions of that sound chip in the PlayStation and PS2.
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