Modern CRTs would politely blank the screen. the moral dilemma of recreating any out-of-sync effects as it's technically flashing and can be extremely inconsiderate. Probably the worst part of crt emulation with regards to PCs is: He did tell me that he would love to have the time to do a write-up just like you did, though! Hopefully that will be enough to prod him into seeing if there's anything more he can do with his shader "crt-geom-deluxe", but he is pretty inactive these days, so we'll see. The actual script has been improved since those videos, especially the first one, so what you see there are not the 'best' possible results but all parameters are tweakable (phosphor decay time, brightness, curvature, shadow mask type/size etc.)įor my part, I've pointed cgwg, the MAME contributor who created a few of MAME's shaders, at your Github. Maybe you guys could get a few ideas from my non-realtime (video processing only, no shaders) attempts at color/mono CRT simulations. VileR wrote on, 09:59: Maybe you guys could get a few ideas from my non-realtime (video processing only, no shaders) attempts at color/mono CRT simulat That's essentially what cool-retro-term without knowing tries to emulate in default configuration. Some people used old oscilloscope for that, they simply swapped the CRT for a 7 sec model. It was based on radar screens based on P7 (?) which has an afterglow of 7-8 secs. It kinda makes me sad that people forget that the human eye also has rods for gray information, besides the green (4), blue (2), red (2) related cones.ītw, there's a special use case: Slow Scan TV (SSTV). Which in turn can natively be processed by a single mono CRT tube. The Composite signal (CVBS) we all have a love/hate relationship with is based on the VBS signal, for example, which is just luma (brightness), sync and blanking combined. ![]() They are more blurry for several reasons (focus etc), but equally "pure". That's why I love old b/w tv sets, too, btw. It makes sense, because it's just one tube that does its magic. Yes, that matches what I learned - mono CRTs have no mask. You'll only see signs of pixellation in single lines (As most non bold characters are) and along edges, and then it will be indistinct. The pixels are a spot of diminishing brightness from the center so in a block are evenly lit. Mono monitors don't have a pixel grid like a color monitor, just the entire back of the glass is phosphor and it lights where the beams hit. Those monitors were meant for professional use and draw very fine structures. I think that's one of the features that provide that mono CRT feel.Įdit: Vids must be watched in 1080p, unfortunately. That being said, what cool-retro-term does fine is that "bloom" and glow effect. The backgrounds are not glowing, either, unless brightness is turned up way too much.Įdit: I have no time for testing at the moment, sadly, but these monitors can be seen in some of my older videos: ![]() The physical devices are much more crisp (very tiny, grainy pixels visible) and the afterglow more subtle, as you said.Īnd there are no moving scan lines and wobble effects, as seen in coolretroterm. įrom what I remember, in the default config, coolretroterm is a bit too excessive with the effects by comparison, even: I do have a few green/amber monitors stored in the attic (bas and mda/ttl). ![]() That retro term is nice but is missing emulation of the individual pixels and phosphors within, which would create a grainy grid-like effect. Those displays sometimes had a minor but noticeable delay of the phosphors. Proper early monochrome CGA/Hercules requires ghosting, too.
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