RGB output from composite PPU
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- wyatt8740
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Re: RGB output from composite PPU
...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
No matter what year it is, 1980 was about 20 years ago, and you can't change my mind.
Re: RGB output from composite PPU
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.lidnariq wrote:Allow steering of $4014 DMA to $2007 instead of only $2004
Quietust, QMT Productions
P.S. If you don't get this note, let me know and I'll write you another.
P.S. If you don't get this note, let me know and I'll write you another.
Re: RGB output from composite PPU
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?
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?
Re: RGB output from composite PPU
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.Quietust wrote: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.lidnariq wrote:Allow steering of $4014 DMA to $2007 instead of only $2004
Re: RGB output from composite PPU
Looks like someone took the idea and put it in a need little package ready to be ordered.
There are still rooms for improvements though, like configurable palettes, component output etc.
There are still rooms for improvements though, like configurable palettes, component output etc.
Re: RGB output from composite PPU
Personally I'd rather get rgb and use an external rgb to component converter.hyarion wrote:Looks like someone took the idea and put it in a need little package ready to be ordered.
There are still rooms for improvements though, like configurable palettes, component output etc.
- mikejmoffitt
- Posts: 1353
- Joined: Sun May 27, 2012 8:43 pm
Re: RGB output from composite PPU
Ordered one. Hyped. Going to try to cram it into an original Famicom.
Re: RGB output from composite PPU
I'd love to see how you'd get it to fit. I can't wait to get my hands on the nes 2 / av famicom adapters.mikejmoffitt wrote:Ordered one. Hyped. Going to try to cram it into an original Famicom.
- mikejmoffitt
- Posts: 1353
- Joined: Sun May 27, 2012 8:43 pm
Re: RGB output from composite PPU
Do you have source codes for such device?
(Free Hero Mesh - FOSS puzzle game engine)
- mikejmoffitt
- Posts: 1353
- Joined: Sun May 27, 2012 8:43 pm
Re: RGB output from composite PPU
I imagine he does not want to release such a thing immediately, but given the information provided it shouldn't be too hard to replicate the functionality for someone experienced with PLDs / FPGAs.
Re: RGB output from composite PPU
Yes, I expect that can help.mikejmoffitt wrote:I imagine he does not want to release such a thing immediately, but given the information provided it shouldn't be too hard to replicate the functionality for someone experienced with PLDs / FPGAs.
(Free Hero Mesh - FOSS puzzle game engine)
Re: RGB output from composite PPU
That's exciting news, but 90$? Seriously?
Re: RGB output from composite PPU
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 ~$10 assembled.SkinnyV wrote:That's exciting news, but 90$? Seriously?
Re: RGB output from composite PPU
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?