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Nintendo NES
Posted: Fri Aug 05, 2005 2:39 am
by bvold
Hi Guys,
I know what that the 6502 is used for sound on the Nintendo. I was wondering though if anyone know what the main processor was?
Thanks Again,
bvold,
Re: Nintendo NES
Posted: Fri Aug 05, 2005 5:54 pm
by HansO
Hi Guys,
I know what that the 6502 is used for sound on the Nintendo. I was wondering though if anyone know what the main processor was?
Thanks Again,
bvold,
The same 6502?
The SNES used the 65816 btw
Posted: Fri Aug 05, 2005 7:56 pm
by Raf
it;s not the same cpu , it has got rid of decimal mode and has got instructions for gfx and sound but I'm not keen on it , see
http://nesdev.parodius.com/
Posted: Sat Aug 06, 2005 2:57 am
by ndru
The main processor used in the NES is the Ricoh RP2A03G, a 6502 variant with built-in audio processing capabilities, and which lacks the Binary Coded Decimal mode. As far as I know, the 2A03 and 6502 are otherwise identical. Graphics are generated by the RP2C02G co-processor, otherwise known as the Picture Processing Unit (PPU).
Posted: Mon Aug 08, 2005 4:07 am
by Memblers
The 2A03 also has some a couple DMA features. One copies a page of memory to the PPU's OAM (object attribute memory), which takes 2 CPU cycles per byte. The other DMA is used for playing delta-modulated samples. The registers for the internal stuff are all at $4000-$4017