Digital output uses a DAC. Its in the cable and converts to YPbPr so your tv can actually "understand" what its being sent (i.e. component video)
GCN Digital A/V -> DVI/HDMI would be very handy and should output the best possible quality. Wonder if the video chip can be forced to higher scanrates in a similar way to the PS2's? Would be interesting if it were possible to make "mode promotion" homebrew similar to GS Mode Selector on the PS2.
Last edited by Lum; 04-17-2012 at 07:11 PM.
On N64, the checkboard is static
On the GameCube though the checkerboard rolls to the left
these and one of these. I'll post some pics when they arrive. You never know, maybe it's just the cable... If the official cable doesn't fix it I'd be happy to try out this suggestion. What value cap should I use?
Last edited by fathertime; 04-17-2012 at 07:52 PM.
To think the Megadrive vertical bars are less annoying than a checkerboard.
I think this thread has wasted everybody's time :) An official sealed Gamecube RGB cable arrived today and guess what? It looks fantastic! No checkerboard crosshatch and it rivals the component cable display through the wii. The 3rd party RGB cables may have worked on CRT but for Samsung, go official only! I ordered my official cable from this guy on ebay - cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=170824048231
Last edited by fathertime; 04-25-2012 at 12:01 PM.
I'll open the 3rd party and official cables over the weekend and take some pictures - that's assuming all the parts are in the scart end and not the multiout end...
I can tell you though, the official cable is a lot thicker and heavier. The 3rd party one even feels cheap in comparison.
Wish I had seen this thread earlier, as I looked into this topic years ago so perhaps I can help a little :)
PAL GameCube uses 'AVE P-DOL' which outputs RGB and Composite Video:-
NTSC GameCube uses 'AVE N-DOL' which outputs S-Video and Composite Video (Unsure if it does actually output C-Sync?):-
So unless there are some unused pins on the 'AVE P-DOL' which output C-Sync or S-Video then i'm afraid your out of luck :(
(I also made a partial pinout of the DAC's which I will try and dig out and tidy up if anybody is interested?)
The PAL GameCube and PAL N64 both need a 75ohm resistor to ground and 220uF capacitor in series (Positive leg always towards console, negative leg towards TV/Display) on the Composite Video line, otherwise you can expect video quality problems like those shown in the above pictures. I even added this information in the gamesx wiki:-
Most third party Nintendo MULTI OUT cables are missing these components, since they are mainly designed for the NTSC market, not PAL. The official PAL GameCube Composite cable and official PAL GameCube SCART cable have both these components on Composite video (Just to be awkward the official SCART cable has one component located in each end of the cable - 75ohm resistor hidden inside MULTI-OUT plug, 220uF capacitor on SCART plug PCB)
Of course cable quality and adequate shielding can also play a part ;)
Page 42/Sheet 38 shows the pinout of the Digital AV Port:-
Which I helped update on the gamesx wiki:-
Page 22/Sheet 18 shows the digital signal format.
Theres plenty more information in the patent as well.
All it would take is someone with the right technical knowledge to use an FPGA to create a proper HDMI cable for the GameCube, much like how marshallh is adding VGA to the N64:-
Only the GameCube wouldnt even require any soldering if we could find a company willing to make the custom Digital AV plugs.
Last edited by link83; 04-26-2012 at 08:53 AM.
Hmm, doesn't appear it'd be a complicated FPGA. YCbCr is acceptable under the HDMI standard.
Not a "complicated FPGA"?? Have you worked with FPGA? Designed a PCB for one? Using high-speed transceivers? Done transmission line analysis? Designed any termination circuit? Designed controlled impedance traces? Written a TMDS or any 8b/10b encoder? A SDRAM controller? Deinterlacer/upscanner? Designed DC-DC converters? Soldered VQFP? Soldered FBGA?
Everything is complicated. Even without upscanning 480p requires 270 MHz serialization = 810 MHz minimum analog bandwidth to get anything resembling a square wave.
Last edited by Calpis; 04-25-2012 at 09:50 PM.
those who can't make, mod
Last edited by fathertime; 05-05-2012 at 06:38 AM.
Termination is very important in video. There will always be a 75 ohm parallel terminator in the TV, but video sources can have series, parallel or no source termination. It sounds like without the right PAL cable there is no source termination which means that any signal reflected will interfere with the source.
those who can't make, mod