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bvold
 Post subject: Nintendo NES
PostPosted: Fri Aug 05, 2005 2:39 am 
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Joined: Thu Jul 07, 2005 12:34 am
Posts: 23
Location: Minnesota
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,
:twisted: :D
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HansO
 Post subject: Re: Nintendo NES
PostPosted: Fri Aug 05, 2005 5:54 pm 
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Joined: Fri Oct 31, 2003 10:00 pm
Posts: 200
bvold wrote:
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,
:twisted: :D


The same 6502?
The SNES used the 65816 btw
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Raf
 Post subject:
PostPosted: Fri Aug 05, 2005 7:56 pm 
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Joined: Tue Aug 02, 2005 9:42 pm
Posts: 19
Location: Poland
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/

_________________
owns 1xC128, 1x128D cr ,1xc64 (broken unfortunately) ,1xc64c ,2xc64g (one is broken) ,~4xc64e ,1x1541 ,1x1541-II ,1x1541C and some chips for those machines ;-)

www.vulture.c64.org
www.rafalszyja.republika.pl
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ndru
 Post subject:
PostPosted: Sat Aug 06, 2005 2:57 am 
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Joined: Tue Aug 10, 2004 2:40 am
Posts: 21
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).
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Memblers
 Post subject:
PostPosted: Mon Aug 08, 2005 4:07 am 
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Joined: Thu Jan 16, 2003 12:55 pm
Posts: 64
Location: Indianapolis
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
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