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If the software is able to display a 480p content at 15 kHz 480i, it may be possible to "remove" the sync pulsations of the interlacing before the output and display a 640x240 frame.
It's not exaclty a genuine 320x240, but it's impossible to make the distinction. ^^

Even if nothing is done on that way, as long as you display a non filtred 480i picture with the same content for each pairs of lines, you have the possibility to get a nice 240p picture by removing the interlacing in the TVs that allow it (or in any 15 kHz monitor if I achieve my little electronic circuit ^^).

That's why video games die inexorably as time goes by.

Some interlaced PS2 games should be originally 224 lines instead of 240, like, say, the ports of Psikyo games.

It's even worse, considering the PAL and NTSC resolutions: so, in many compilations, you have games with 224 lines that are stretched to 480 lines (PAL resolution of the PS2, 50 Hz) , and you have games with 240 lines stretched to 448 (NTSC resolution, 60 Hz).

I tried Mushi. It's badly scaled on the Y axis (240 to 448) as you know, but even on the X axis !!! When the backgrounds scroll, there are several places where the lines are suddenly divided...
It's small, but it's anoying. And of course the game is filtred.

I'm thinking indeed about many possibilities. Windows games at 320 x 240 design resolution but with forced 640 x 480 mode in full screen, for instance. There're lots of doujin games like that (some do keep the desktop rez, fortunately for us with 15 kHz cards, but very few).

If the game runs at 640x480 with a clean line doubling, there's no need to force it to 320x240. Just run the graphic card at 480i, and disable the interlacing on the TV.

If you use Windows XP, when you force the game at a lower resolution, it may be filtred, as everything is filtred by now (on Windows 2000, the defaut image viewer didn't filter the pictures when you saw them at different resolution, for example).

There is no danger for the TV, the deinterlacing process doesn't modify frequency, timings and voltage amplitude of the signal. It's just a question of skipping some sync lines and the half-scanline of the regular interlaced signal.

Every old game systems that run at 240p use non standard signal, a video signal  with (deliberately) missing sync informations. That's the secret. :)

First, you can only find it in numerical chassis (TVs from 1995 and after). In some TVs, it is explicitly indicated in some menus:

http://raster.effect.free.fr/15khz/480i … 8366_2.jpg

( other pictures at : http://raster.effect.free.fr/15khz/480i-240p/  )

This example is a 1995 Trinitron.

At the time I didn't go further, because I noticed that the "deinterlaced" picture looks awfull if the source was filtred (either bilinear or anti-flicker)...
If the game or the system doesn't allow you to display a clean picture, it's not worthy to try to display 240p. If You try to regain scalines from a game with 240 lines that have been scaled to 448 lines (the typical PS2 case) and filtred, you'll get nasty flickering on few lines, and shitty picture anyway.

But when you start from a nice source (an emulator set at 480i with perfect line doubling and no filters, displayed on your TV with soft15khz), it gives you perfect results ! (and absolutly no lag)