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PostPosted: Thu Jun 06, 2013 9:16 am 
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...This is spectacular. I always thought that since a Commodore VIC can be modded for rgb, a NES should. I must have been right for once! :D


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PostPosted: Thu Jun 06, 2013 1:41 pm 
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lidnariq wrote:
Allow steering of $4014 DMA to $2007 instead of only $2004

Unless you're replacing the entire PPU, I'm not sure that will actually work - last I checked (in visual2c02), the PPU wasn't capable of reacting to such rapid writes to $2007.

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PostPosted: Thu Jun 06, 2013 4:13 pm 
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Oh good point! Visual2C02 indicates that it takes roughly 19 to 22 cycles (5ish pixels?) from the start of io_ce and w2007 until the /WR strobe goes false again, and it seems to be synchronized to various PPU-internal pixel clocks. That's very close to the 6 pixel spacing DMA does, and a PPU program of "W 7 1e / - 0 18 / W 7 18 / - 0 18" does show it getting confused.

If the device controls clocks for the CPU and PPU separately, then it should be possible to work around by slowing down the CPU clock during DMA. I wonder how much is necessary?


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PostPosted: Thu Jun 06, 2013 7:38 pm 
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Quietust wrote:
lidnariq wrote:
Allow steering of $4014 DMA to $2007 instead of only $2004

Unless you're replacing the entire PPU, I'm not sure that will actually work - last I checked (in visual2c02), the PPU wasn't capable of reacting to such rapid writes to $2007.

The PPU wouldn't need to react. The mapper's dual-ported VRAM feature would snoop on $2004 writes, and the program would run DMA transfers to OAM and on-cart VRAM at once, followed by a final DMA to OAM.


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PostPosted: Wed Oct 09, 2013 5:43 am 
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Looks like someone took the idea and put it in a need little package ready to be ordered.
There are still rooms for improvements though, like configurable palettes, component output etc.


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PostPosted: Sun Oct 20, 2013 3:33 am 
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hyarion wrote:
Looks like someone took the idea and put it in a need little package ready to be ordered.
There are still rooms for improvements though, like configurable palettes, component output etc.

Personally I'd rather get rgb and use an external rgb to component converter.


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PostPosted: Sun Oct 20, 2013 8:53 am 
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Ordered one. Hyped. Going to try to cram it into an original Famicom.


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PostPosted: Sun Oct 20, 2013 5:17 pm 
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mikejmoffitt wrote:
Ordered one. Hyped. Going to try to cram it into an original Famicom.

I'd love to see how you'd get it to fit. I can't wait to get my hands on the nes 2 / av famicom adapters.


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PostPosted: Mon Oct 21, 2013 9:44 am 
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Thought I'd post the URL for anyone else who is interested:

http://etim.net.au/nesrgb/index.htm


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PostPosted: Thu Oct 24, 2013 11:58 am 
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Do you have source codes for such device?

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PostPosted: Thu Oct 24, 2013 12:29 pm 
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I imagine he does not want to release such a thing immediately, but given the information provided it shouldn't be too hard to replicate the functionality for someone experienced with PLDs / FPGAs.


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PostPosted: Fri Oct 25, 2013 3:16 pm 
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mikejmoffitt wrote:
I imagine he does not want to release such a thing immediately, but given the information provided it shouldn't be too hard to replicate the functionality for someone experienced with PLDs / FPGAs.
Yes, I expect that can help.

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PostPosted: Fri Oct 25, 2013 7:17 pm 
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That's exciting news, but 90$? Seriously?


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PostPosted: Fri Oct 25, 2013 8:57 pm 
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SkinnyV wrote:
That's exciting news, but 90$? Seriously?


When there's nothing else to compete, why make it cheap? Hopefully someone undercuts this stuff. How much does the FPGA cost? rest of the board can't be more than ~$10 assembled.


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PostPosted: Fri Oct 25, 2013 9:14 pm 
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Only thing annoying me is everyone calling the guy a genius when it was thefox's brain child. I ordered one, $90 is somewhat fair, still cheaper than a RGB ppu. Kinda lame there is no component out and his only comment about that was that tvs with component inputs are 'relatively new'...what the hell?


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