The Ricoh 2A03 or RP2A03 (NTSC version) / Ricoh 2A07 or RP2A07 (PAL version) is the 8-bit microprocessor in the Nintendo Entertainment System video game console. It was manufactured by Ricoh. It contained a second-source MOS Technology 6502 core, lacking the 6502's binary-coded decimal mode, with 22 memory-mapped I/O registers that controlled Programmable Sound Generators, rudimentary DMA, and game controller polling.[1]
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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 the 50 Hz vertical refresh rate used in the PAL television standard.
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