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The Ricoh 5A22 is a "microprocessor produced by "Ricoh for the "Super Nintendo Entertainment System (SNES) video game console. The 5A22 is based on the "16-bit "CMD/GTE 65c816, itself a version of the "WDC "65C816 (used in the "Apple IIGS personal computer). It has a "16-bit "accumulator, a 24-bit "address bus, and is based on the "MOS Technology 6502 family of processors.
In addition to the 65C816 CPU core, the 5A22 contains support hardware, including:
The CPU as a whole employs a variable-speed "system bus, with bus access times determined by the memory location accessed. The bus runs at 3.58 MHz for non-access cycles and when accessing Bus B and most internal registers, and either 2.68 or 3.58 MHz when accessing Bus A. It runs at 1.79 MHz only when accessing the controller port serial-access registers. It works at approximately 1.5 "MIPS and has a theoretical peak of 1.79 million 16-bit adds per second.
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