Video signal from old consoles - AVS Forum
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post #1 of 4 Old 04-21-2010, 02:00 PM - Thread Starter
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Hi, I'm wondering about the details of the video signal that is output from older NTSC consoles like the N64, PS1, and earlier. Some games on these systems are capable of 480i (Tekken 3), but most games appear to only display 240 non-interlacing scan lines. Presumably this is because the graphics processing can't handle more than a 320 x 240 resolution.

So, does anyone know what is done to the NTSC signal to achieve this? I have two ideas: 1) Every other field is simply black - although I suspect the result of that would be video that is too dark and flickery. Or 2) The vertical retrace pulse is tweaked so that the odd & even fields don't interlace, they just overwrite each other. I'm a little skeptical of that option because it seems to break NTSC specification and would increase danger of phosphor burn-in.

Thanks!
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post #2 of 4 Old 04-28-2010, 01:01 PM - Thread Starter
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Please lock this thread, I'm moving it to the CRT display devices forum:

...avsforum.com/avs-vb/showthread.php?t=1245938
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post #3 of 4 Old 04-29-2010, 05:09 AM
 
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Option 2 is close enough. Yeah, timing is played with a bit so that the result is a 240p image.
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post #4 of 4 Old 04-29-2010, 05:30 AM
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No idea...
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