[quote name='encendido5']Good to know... I'm still a n00b with the HD technology.[/QUOTE]
Well, make sure that the TV does have VGA first.
Is HDMI considered superior to VGA?
Yes.
Cable quality goes from...
RF- Everything combined on one signal.
Composite- Splits stereo sound off of video. Limited to something like 320x240 res (not exact because it's analog).
Svideo- Splits the video signal into color and light or something like that. Limited to widescreen NTSC res.
Component- Further splits the signal, but focuses on color accuracy and light intensity but not so much on precision. (I think it may also be able to transmit data in a way that focuses on precision instead) I believe all of our electronic equipment works in RGB (so focused more on precision) instead of YUV, so this format features the downsides of both YUV output and RGB rendering.
RGB- Transmit the color information and is very precise so it gives a sharper image than component. Also doesn't have to deal with the RGB to YUV conversion.
VGA- Basically RGB but now sync timings are transmitted so the image should have the correct aspect ratio and positioning. These additional signals aren't needed to a TV as TVs only support certain fixed resolutions and refresh rates. I'm not sure if D-Sub is closer to VGA or RGB.
DVI- A digital RGB signal ensuring no image quality degradation. I believe also additional information is transmitted to ensure 100% color precision and correct image positioning and aspect ratios.
HDMI- Same as DVI, but audio is bundled into the cable as well. The audio signal is still seperate from the video signal however.
PS2 has native support for RGB and VGA, but most software doesn't enable support for VGA.
Gamecube just outputs a digital RGB signal (plus digital PCM sound) and then relies on an external encoder chip to convert it to the correct signal. Gamecube could theoretically support any connection type, but the highest I've seen are RGB/D-Sub/VGA, simply because Nintendo already released the hardware necessary to convert to these (the chip in the component/d-sub cables). I'd imagine a conversion to DVI is also possible if someone wanted to make the cable and encoder chip.
Xbox does not have native support for VGA, so its highest quality signal is component. I believe it can be internally modded to support RGB/VGA, I think it uses an encoder chip similar to what's in the gamecube vga cables, except it's in the system and lower quality. (at least on 1st gen xbox's) I'm not sure about the RGB support, do true RGB cables exist for xbox, or are they like the majority of the gamecube ones that just output svideo?
For audio...
There's the standard RCA jacks which output stereo.
And digital cables that output stereo. There's coaxial and optical. Coaxial is basically a heavy duty RCA cable and transmits an electrical signal, optical uses a laser and a glass wire. Not sure which might offer better quality, but optical cables are more fragile and need to be lined up correctly with the laser to get a signal, so I think they suck. I've had a heck of a lot of problems with my xbox's audio because it uses optical cables.
Then there are the formats DTS, Dolby Pro Logic (2), and Dolby Digital. All of these are surround sound compressed into stereo channels. However, digital offers more bandwidth than analog cables, so the digital compressions are less lossy. I don't know why they just don't do uncompressed surround sound, it's definetely possible to make a cable that can transmit 5.1 surround sound. (maybe even a standard coaxial cable has the bandwidth?)