Ricoh 2A03

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RP2A07
RP2A07

The Ricoh 2A03 or RP2A03 (NTSC version) / Ricoh 2A07 or RP2A07 (PAL version) was the 8-bit microprocessor in the Nintendo Entertainment System video game console. It was manufactured by Ricoh. It contained a second-source 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]

[edit] 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 to account for the 50Hz vertical refresh rate used in the PAL television standard.

[edit] See also

Nintendo Entertainment System technical specifications

[edit] References

  1. ^ Taylor, Brad (2004-04-23). 2A03 technical reference. Retrieved on 2008-06-06.


65xx-series CPUs from MOS Technology, second source/clone vendors, and the Western Design Center

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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