Ricoh 2A03: Difference between revisions

[[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&nbsp;MHz. PAL versions used the 2A07 processor, which is identical to the 2A03 except that it runs at 1.66&nbsp;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 -– Nocash NES Specs]</ref><ref name="nl">[http://www.rgame.nl/nesspecs_eng.html NES specificaties]</ref><ref>[http://nesdev.com/2A03%20technical%20reference.txt 2A03 technical reference] by Brad Taylor, 23 Apr. 2004</ref> There is no seperate soundchip. The APU, a [[Programmable Sound Generator|PSG]] integrated in the 2A03 is used to produce audio.<ref>FamiTracker forum:[http://famitracker.com/forum/posts.php?id=4994 NES synthesis theory books]</ref>

== References ==

== External links ==

* [http://web.archive.org/web/20021122134759/http://greybox.norfair.org/ greybox], a MIDI-controlled synthesizer that uses the 2A03s on-chip sound generator.