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 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]
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 different audio frequency lookup tables to account for the 50Hz vertical refresh rate used in the PAL television standard.
See also
References
- ^ Taylor, Brad (2004-04-23). "2A03 technical reference". http://www.nesdev.com/2A03%20technical%20reference.txt. Retrieved 2008-06-06.
| 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 |
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