Line Skipping for Scanline Effect on Real DOS PC?

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Line Skipping for Scanline Effect on Real DOS PC?

Postby Titan91 » 2017-12-03 @ 19:45

I have several DOS games that run in VGA mode but the spacial resolution is less, more like 320x200. My AGP card scales this up to 640x480. I am using a real CRT monitor but was wondering if it's possible to skip every other line in software so each physically drawn scanline on the screen corresponds to its own line of pixels from the game, instead of being line doubled. I have done this with photoshopped screenshots opened within Windows at 640x480:

http://i.imgur.com/ibtIST9.jpg
http://i.imgur.com/xhM1Okk.jpg
http://i.imgur.com/s1w8hwX.jpg
http://i.imgur.com/rYPDRcK.jpg
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Re: Line Skipping for Scanline Effect on Real DOS PC?

Postby leileilol » 2017-12-03 @ 23:47

Some old emulators for DOS (Zsnes, Nesticle, Loopynes) have special video modes to evoke natural scanlines (and I don't mean just dropping black on every other line in a simulated 640x480)

Though on many old monitors these modes would appear simply squished. The VGA standard typically calls for <350 line modes to be doublescanned
Voodoo2s aren't 100mhz stock
Geforce256 isn't released as a beta on New Years '99 under the Quadro brand
386DX vs SX isn't about a missing FPU
DOS gaming isn't a bilinear 320x200 16:10
DOS PCs aren't better than the Macintosh
Old PCs aren't 'aesthetic'
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Re: Line Skipping for Scanline Effect on Real DOS PC?

Postby jxhicks » 2017-12-05 @ 19:57

You could use a scanline generator much like this https://www.focusattack.com/scan-dl-vga ... generator/. It should give you the effect you are looking for, though it is also going to reduce the overall brightness of the screen quite a bit.
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