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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 .
Ricoh manufactured several electronic components for video game consoles - the Ricoh 2A03 8-bit CPU with built-in PSG sound as well as the Ricoh 2C02 ( PPU) used in the Nintendo Entertainment System (2A07 CPU in the PAL NES and the 6538 PPU in PAL famiclones ), and the Ricoh 5A22 16-bit CPU and the Ricoh 5C77 and Ricoh 5C78 PPUs used in the Supe...
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Aug 31, 2020 · The Ricoh 2A03, RP2A03 (NTSC), Ricoh 2A07, RP2A07 (PAL) or 2A03 is the 8-bit microprocessor in the Nintendo Entertainment System (NES), (also known as the Famicom). Technical details. Manufactured by Ricoh and based on the MOS Technology 6502. NTSC versions of the NES use the 2A03, which is run at 1.79 MHz.
The Ricoh 2A03 (NTSC) and 2A07 (PAL) are best thought of as ASIC devices. They include a 6502-compatible CPU core, but these chips also include the NES's 5-voice Programmable Sound Generator . The inclusion of the PSG, plus other I/O interfaces for the NES, together resulted in 22 internal memory-mapped I/O ports that are on-chip.
All illegal 6502 opcodes execute identically on the 2A03/2A07. Every cycle on 6502 is either a read or a write cycle. A printer friendly version covering all section is available here. Emulator authors may wish to emulate the NTSC NES/Famicom CPU at 21441960 Hz ((341×262−0.5)×4×60) to ensure a synchronised/stable 60 frames per second. See also
May 25, 2023 · The RP2A03 is the integrated 8-bit CPU used in the Famicom, Nintendo Entertainment System, Vs. System, PlayChoice-10, and various standalone arcade games. It was created for Nintendo by the circuit manufacturer Ricoh using a licensed version of the 6502 processor, originally developed by MOS Technology.
