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Re: No CRT Emulation? Why!?

Posted on 2023-04-02, 15:22

Yes, some monitors from the 1980s and 90s had anti-glare coatings on them. They actually altered the image on screen, somewhat, too! This is especially noticeable on IBM's PS/1 and PS/2 monitors, as a "glinting sheen" of the image. Hard to describe unless witnessed in person. In a way, these …

Re: No CRT Emulation? Why!?

Posted on 2023-03-30, 07:37

The phosphors distinct on the CM-5. Mine has vertical grey lines that are definitely visible when off, and midly so when on. That will be more difficult to produce. On my picture the r/g/b line colours are visible, but they look grey to me with the naked eye. At the moment my Tandy 1000's 20 …

Re: No CRT Emulation? Why!?

Posted on 2023-03-21, 02:24

I continue to tweak for further clarity and proper graininess. https://i.imgur.com/zHrgeRW.jpg I think the results are getting closer to a real CM-5, despite the inadequate resolution for proper justice. It looks great. Not suggesting that you should change it, but my crappy CM-5 has some flaws …

Re: No CRT Emulation? Why!?

Posted on 2023-03-02, 04:45

CM-5 RGB emulation is getting closer. I'm working on tweaking little nuances: https://i.imgur.com/ZRKHTpi.jpg Unfortunately my monitor is not high enough resolution(1920x1080) to use curvature without severe moire patterns, which detract from 16 color scenes. I have achieved proper excessive …

Re: No CRT Emulation? Why!?

Posted on 2023-02-23, 20:40

Those PS/1 and PS/2 monitors were sublime. They had a "sparkly" sheen to them that only IBM color monitors had. Hard to describe unless you saw one, but the sparkle was real. They had a softness to the image, particularly the prompt text, that was quite pleasing. Wing Commander and even MCGA games …

Re: No CRT Emulation? Why!?

Posted on 2023-02-14, 18:50

The journey continues... https://i.imgur.com/LuoxpWX.jpg Ghosting is important for proper 80s era RGB CRTs, particularly the Tandy CM-5 color monitor. They were unrefined beasts, but produced beautiful images for 16 color games. And of course, there's 80s VGA monitors, too, for those of us fortunate …

Re: DOSBOX on a GSYNC display - it's pretty great!

Posted on 2022-09-02, 01:18

Interesting, but... DOS games were never designed for "crispy perfect pixels" as the monitors of the era had flaws that these games exploited. The only way to take advantage of this is to either get a real era-specific CRT for that title or proper CRT emulation. They definitely weren't crispy, nor …

Re: No CRT Emulation? Why!?

Posted on 2021-10-18, 22:34

Getting that organic glow is hard, but you're right, is far more subtle on real tubes vs. your screenshot. I came closest I think in Reshade using the multipass adjustments and stacking shaders: https://www.youtube.com/watch?v=HIkB7lapnTg&t=28s But that is television tube simulation. Youtube and …

Re: No CRT Emulation? Why!?

Posted on 2021-10-18, 19:16

Proper early monochrome CGA/Hercules requires ghosting, too. Those displays sometimes had a minor but noticeable delay of the phosphors. That retro term is nice but is missing emulation of the individual pixels and phosphors within, which would create a grainy grid-like effect.

Re: No CRT Emulation? Why!?

Posted on 2021-10-07, 19:34

Retroarch lets you tweak as many parameters as the shader defines that you can and even on the fly within a submenu, which is nice. Stuff such as scanline thickness and size are tweakable in some shaders or multipass shader stacks.

Re: No CRT Emulation? Why!?

Posted on 2021-10-07, 19:27

Okay, I reduced the curvature somewhat. Unfortunately when I record video it introduces jitter into the recording. On my screen when playing there is none: https://youtu.be/nhL8ObiFicM The quality takes about 15 seconds to clear up once starting play, too.

Re: No CRT Emulation? Why!?

Posted on 2021-10-07, 17:21

For me the screenshots above have the "spherical" effect way too strong. Real CRTs (those that are not flat) do not look that much distorted. Depends on the tube and their size. My 12 inch RGB tube is quite curved, but many of the later ones(early 90s and on) could adjust pincushion settings to …

Re: No CRT Emulation? Why!?

Posted on 2021-10-07, 03:56

awgamer wrote on 2021-10-07, 03:41: > often .38 - .66, Eh, what? multisync monitors I ever had were .28-.31 like the first nec multisyncs. https://crtdatabase.com/crts/nec/nec-jc-1401p3a The Tandy CM-5 monitor I have is .64 dot pitch, same as the one I had when I was a kid.

Re: No CRT Emulation? Why!?

Posted on 2021-10-07, 02:17

... why RGB tubes were used in arcade machines of the time. They simply looked better. These were normal quality tubes (not the short-life thin cathode variant), just with focus turned not too sharp, so that the "scanlines" were barely recognizable, and definitely not as obtrusive like when wiewing …

Re: No CRT Emulation? Why!?

Posted on 2021-10-06, 19:35

Been a while since posting my progress... Properly emulating a mid-1980s RGB CRT is challenging. These displays had a very poor dot pitch, often .38 - .66, but had many interesting characteristics that dramatically enhanced 320x200 resolution or lower DOS games. A VGA or EGA display of that era …

Re: VGA games with only 16 colors

Posted on 2020-09-18, 18:57

in DOS
Bare in mind Sega Genesis had only 61 active colors from a 512 color pallette, and those games look amazing. Yes, indeed. It looked best via RF, I think. And ok via Composite Video, which also supported the dithering effects still. NES had ~54 colours, I believe (3c per sprite). Super Game Boy had …

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