Ricoh 2A03
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The Ricoh 2A03 or RP2A03 was the 8-bit microprocessor in the Nintendo Family Computer and Nintendo Entertainment System video game consoles sold in Japan and North America. It contained a second-source 6502 core with 22 memory-mapped I/O registers that controlled programmable sound generators, rudimentary DMA, and game controller polling.
Regional variations
European and Australian versions of the NES used the Ricoh 2A07 or RP2A07 processor, which was identical to the 2A03 except for a different clock divider and a different CPU frequency lookup table.
65xx-series CPUs from MOS Technology, second source/clone vendors, and the Western Design Center |
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MOS 4510 ● MOS 6501 ● MOS 6502 ● WDC 65C02 ● Hudson HuC6280 ● Ricoh 2A03 ● MOS 6507 ● MOS 6508 ● MOS 6509 MOS 6510 (and 7501, 8500, 8501) ● MOS 8502 ● MOS 65CE02 ● WDC 65802 ● WDC 65816 ● Ricoh 5A22 ● Nintendo SA-1 |
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