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Kat Manton · 19th Mar 2006, 2:56 am

Hi,

A little more progress; I've lashed up a little circuit to sum R, G and B from the output of the graphics card, here's the result of displaying colourbars on the computer. Y is 0.2V/cm, the output's a little high at 0.8V p-p. X is on 'expanded' locked to frame-sync so I could get the photo, the horizontal timebase could be anything with this old 'scope, but I already know the computer's generating correct timings anyway. The little 'glitches' before and after the greyscale are a 1-pixel wide grey border around the full-scren window displaying the colourbars, by the way.

Now, just add syncs...

Regards, Kat

19th Mar 2006, 2:56 am	#45
Kat Manton Retired Dormant Member Join Date: Jul 2005 Location: West Yorkshire, UK. Posts: 1,700	Re: PC as a standard converter - more progress Hi, A little more progress; I've lashed up a little circuit to sum R, G and B from the output of the graphics card, here's the result of displaying colourbars on the computer. Y is 0.2V/cm, the output's a little high at 0.8V p-p. X is on 'expanded' locked to frame-sync so I could get the photo, the horizontal timebase could be anything with this old 'scope, but I already know the computer's generating correct timings anyway. The little 'glitches' before and after the greyscale are a 1-pixel wide grey border around the full-scren window displaying the colourbars, by the way. Now, just add syncs... Regards, Kat Attached Thumbnails