Ricoh 2A03

Ricoh 2A03 / Ricoh 2A07

Produced	From 1982 to 1994
Common manufacturer(s)	Nintendo, Ricoh
Max. CPU clock rate	1.79 MHz
Min. feature size	6 μm
Instruction set	MOS 6502
Cores	1
Socket(s)	Surface mount dual inline package (DIP)

RP2A07A alone.

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.

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 the 50 Hz vertical refresh rate used in the PAL television standard.

See also

• Nintendo Entertainment System technical specifications