|Max. CPU clock rate||1.79 MHz|
|Architecture and classification|
|Min. feature size||6 μm|
|Instruction set||MOS 6502|
The Ricoh 2A03 or RP2A03 (NTSC version) / Ricoh 2A07 or RP2A07 (PAL version) is an 8-bit microprocessor manufactured by Ricoh for the Nintendo Entertainment System video game console. It was also used as a sound chip and secondary CPU by Nintendo's arcade games Punch-Out!! and Donkey Kong 3.
The Ricoh 2A03 contained a second sourced MOS Technology 6502 core, modified to disable the 6502's binary-coded decimal mode (possibly to avoid a MOS Technology patent). It also integrated a programmable sound generator (also known as APU, featuring twenty two memory-mapped I/O registers), rudimentary DMA, and game controller polling.
- Sattler, Christian. "Nintendo RP2A03 and RP2A07 - an high quality picture of the die". visual6502.org. Retrieved 2020-08-12..
- "Sound generators of the 1980s home computers". www.atkinsoft.com. Retrieved 2019-12-02.
- Taylor, Brad (April 23, 2004). "2A03 technical reference". NesDev.com. Archived from the original on October 17, 2018. Retrieved June 6, 2008.