Idea about 1.6 video chip

Hello

Me, an unfortunate xbox owner, went and bought the 1.6 version as my 
first xbox a week ago. :) Now I have actually read more the pages and 
found out the reason why I got no RGB output with Cromwell 2.40 (the 
latest it says) and Xebian. I was able to tune the composite picture on 
a CBM 1084 video monitor so that all of the X screen is visible (that 
way workarounding the overscan issue.) However that won't help with the 
television set in the living room, and I really want RGB for that extra 
picture quality and possibly for connecting a VGA monitor (I have a 
LM1881 circuit ready.)

Then I got this idea:

Would it be possible to solder a new video chip in place to the xbox? It 
seems to be a SMD chip with rather few pins. Maybe cutting the VDD or CS 
pins of it would disable it enough to solder a new chip top of it. If it 
wouldn't work, you could always unsolder the new chip and fix the few 
old pins. So, do you have any idea of the pin out of this new IC and 
what might be similair replacement for it? There was some talk about a 
SIS chip which is similair to those in the older xbox models. Maybe it 
could be possible to order free samples from SIS, or maybe actually pay 
for a bunch of them. Do you know exact model number or IC code of that 
chip? I could look up a datasheet and compare them.

I also got another idea. It says that as it is, there is component 
output active besides the composite video. The intensity component 
actually goes to the green pin of RGB, that why there is that greenish 
picture. Could it be possible to build some analog circuit to convert 
the component signals into RGB? That way you could get RGB quality even 
though there would still be that overscan problem and no resolutions 
greater than 640x480.


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