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ppppenguin · 4th Mar 2006, 1:55 pm

There's a reasonable chance of getting a graphics card to output RGB analogue 405. Some may go down to such low scan rates, others will not.

There are 2 further problems that I can see. The first is the sheer inconvenience of having your PC's output at 405! This might be solved by having 2 graphics cards in the PC or a dual head graphics card. The more interesting problem is producing decent 405 line mixed sync. Graphics cards generate separate H and V sync. While these could be simply added to the video the result would not have proper vertical sync serrations and the sync pulse widths might well not be correct.

I'm not trying to put anyone off the project. Honestly!

4th Mar 2006, 1:55 pm	#23
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: PC as a standard convertor There's a reasonable chance of getting a graphics card to output RGB analogue 405. Some may go down to such low scan rates, others will not. There are 2 further problems that I can see. The first is the sheer inconvenience of having your PC's output at 405! This might be solved by having 2 graphics cards in the PC or a dual head graphics card. The more interesting problem is producing decent 405 line mixed sync. Graphics cards generate separate H and V sync. While these could be simply added to the video the result would not have proper vertical sync serrations and the sync pulse widths might well not be correct. I'm not trying to put anyone off the project. Honestly!