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[[File:RP2A07.jpg|thumb|right|250px|The RP2A07 PAL version.]]The '''Ricoh 2A03''', '''RP2A03''' (NTSC), '''Ricoh 2A07''', '''RP2A07''' (PAL) or '''2A03''' is the [[8-bit]] [[microprocessor]] in the [https://en.wikipedia.org/wiki/Nintendo_Entertainment_System NES], (also known as the Famicom).
== Technical details ==
Manufactured by [https://en.wikipedia.org/wiki/Ricoh Ricoh] and based on the [https://en.wikipedia.org/wiki/MOS_Technology_6502 MOS Technology 6502]. NTSC versions of the NES use the 2A03, which is run at 1.79 MHz. PAL versions used the 2A07 processor, which is identical to the 2A03 except that it runs at 1.66 MHz. Timing differences between NTSC & PAL versions are to ensure that the sound output is the same on either.<ref name="de">[http://problemkaputt.de/everynes.htm Everynes
== References ==
{{reflist}}
== External links ==
* Nesdev wiki:[http://wiki.nesdev.com/w/index.php/APU NES APU]
* Wikipedia, Nintendo Entertainment System technical specifications, [https://en.wikipedia.org/wiki/Nintendo_Entertainment_System_technical_specifications#Audio Audio]
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* [http://midibox.org/forums/topic/4484-midibox-nes/ MIDIbox NES?]
* [https://www.gearslutz.com/board/electronic-music-instruments-electronic-music-production/358991-turn-nes-into-synth.html Turn NES into synth]
* [http://web.archive.org/web/20021122134759/http://greybox.norfair.org/ greybox], a MIDI-controlled synthesizer that uses the 2A03s on-chip sound generator.
* [http://www.eecg.toronto.edu/~pc/courses/432/2008/projects/nes-audio.pdf FPGA Implementation of the NES Audio Processing Unit]
* [https://www.youtube.com/channel/UCef3TQ1gY4XIhoIGfLqBPqQ/videos NESizer] by Johan Fjeldtvedt, YouTube
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