Wikipedia: History of MOS Technologies 6502

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One of the more important uses of the 6502 was in the Nintendo Entertainment System or NES, Famicom in Japan. The 6502 used in the NES was a modified version that was produced solely for Nintendo. The 6502 was not capable of handling all of the NES's graphics therefore a special chip was used.

One of the more important uses of the 6502 was in the Nintendo Entertainment System or NES, Famicom in Japan.
The 6502 used in the NES was a modified version that was produced solely for Nintendo, called "2A03".
The 2A03 lacked the 6502's decimal mode but added 23 memory-mapped registers for sound generation, object drawing, and joypad reading.

	Revision 5 . . December 11, 2001 7:17 am by Damian Yerrick [Changes to the 6502 to create Nintendo 2A03]
	Revision 4 . . December 10, 2001 8:39 am by (logged).101.246.xxx
	Revision 3 . . December 9, 2001 8:45 am by N8chz [Register theme , stack theme and addresing mode theme separated by paragraph.]
	Revision 2 . . October 19, 2001 1:14 pm by Damian Yerrick [Bill Mensch later designed the 65c816]