interlacing

evildragon · Post by **evildragon** » Tue May 01, 2007 8:12 am

here's an example of what im trying to explain..

a technique like this:

this could work...

with that, you could reconstruct a full vertical 480 pixel image (though, an upscaled horizontal 320 pixel image to 640)

http://blackevilweredragon.spymac.com/intfull.jpg

Post by **tepples** » Tue May 01, 2007 10:40 am

But it would only work on those few TVs that treat the NES's 240p signal as 480i. Most of these are digital EDTVs and HDTVs that have a built-in upscaler.

evildragon · Post by **evildragon** » Tue May 01, 2007 11:03 am

tepples wrote:But it would only work on those few TVs that treat the NES's 240p signal as 480i. Most of these are digital EDTVs and HDTVs that have a built-in upscaler.

that's true, that's why i asked if there's an interlacing mode, at all on the NES...

i use an HDTV, so i tend to take it for granted, in fooling it's upscaler..

Bregalad · Post by **Bregalad** » Tue May 01, 2007 11:12 am

that's true, that's why i asked if there's an interlacing mode, at all on the NES...

Again, that is exactly what I asked in the older thread I linked above, and there was a clear negative answer already made.
I assume we're not supposed to tell you one million times the NES cannot interlace. You can do some dithering tough. This doccument explains an intersting concept to get more colors.

evildragon · Post by **evildragon** » Tue May 01, 2007 11:15 am

Bregalad wrote:
that's true, that's why i asked if there's an interlacing mode, at all on the NES...
Again, that is exactly what I asked in the older thread I linked above, and there was a clear negative answer already made.
I assume we're not supposed to tell you one million times the NES cannot interlace. You can do some dithering tough. This doccument explains an intersting concept to get more colors.

no, you don't have to tell me a million times, and im not really asking a million times.. the topic got changed to proving how the 32X in theory could interlace.. (and how if a video device treated 240p as 480i), the NES then could in theory do the same..

Post by **tepples** » Tue May 01, 2007 11:29 am

The Sega Genesis video chip has an interlaced mode. Sonic the Hedgehog 2 used it for multiplayer mode.

evildragon · Post by **evildragon** » Tue May 01, 2007 11:35 am

tepples wrote:The Sega Genesis video chip has an interlaced mode. Sonic the Hedgehog 2 used it for multiplayer mode.

i know, but the 32X itself can't interlace...

my theory (and it has been tried too once, so it's not a theory anymore), aided in 32X doing interlaced video...

Post by **tepples** » Tue May 01, 2007 11:46 am

The 32X genlocked its own video to that of the Genesis. (Evidence: Some 32X games used the Genesis PPU for the backgrounds and the 32X PPU for sprites.) Perhaps if the Genesis PPU was in 480i mode, the 32X would offset every other field down by a half scanline, giving the effect you seek.

But the NES, on the other hand, can't genlock to any 480i source.

evildragon · Post by **evildragon** » Tue May 01, 2007 11:49 am

tepples wrote:The 32X genlocked its own video to that of the Genesis. (Evidence: Some 32X games used the Genesis PPU for the backgrounds and the 32X PPU for sprites.) Perhaps if the Genesis PPU was in 480i mode, the 32X would offset every other field down by a half scanline, giving the effect you seek.

But the NES, on the other hand, can't genlock to any 480i source.

i know that... Doom: 3D graphics done by the 32X.. Text, and HUD done by the Genesis VDP.. i said i've already done this, it works for the 32X...

i think this thread is done, it's already been said the NES can't address any interlaced mode.. but doing this on an HDTV would be pretty cool...