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Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-11-01, 10:42

It will be available in the next release, I want to fix a crash in Plutonia's MAP12 that has appeared on the 0.9 release and didn't exist before. As of now this is the changelog: - C/MS (Game Blaster) music support thanks to Tronix286 - New EGA 320x200 mode, it's a bit faster compared to the older …

Re: Retro Software Development?

Posted on 2022-10-31, 21:17

It's not just a question of having a critical mass of interest. If a new sub-forum is about helping newbies, then you really need a sufficient number of mentors with the experience, wisdom and willingness to answer questions. Given the fact that many learning resources are sparse compared to back …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-10-22, 23:56

Looks very very cool, but I think it has the same issue as my EGA 640x200 dithered mode. The 16 CGA colors don't match well with the dark Doom palette, and that makes the image difficult to see. I'm pretty sure it will look much better with the adapted 16 color playpal + colormap. Reading that in my …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-10-21, 17:09

That's exactly the idea, but as 386/486 CPUs aren't powerful enough to do the pattern-matching in real time, let's use a powerful CPU to make a translation LUT. It's possible to make it full 320x200 but using insane amounts of memory (or reducing the number of colors too much). Basically the idea is …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-10-21, 13:19

What's left? EGA 640x350x4 / VGA 640x480x4 dithered? ANSI from hell :D I think I've found a way to use this technique on FastDoom, if I use a precalculated LUT (128Kb) I can bump the CGA resolution to 320x100 16-color with little CPU usage (although will require lot's of RAM bandwidth). Will not be …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-10-21, 07:26

Thanks very much for this, especially the continued optimisation of Hercules. I now get a frantic 2.1fps on my 386sx/25 compared to around 1.7fps with one of the previous versions! Might finally upgrade this system to a DX/40 and see if I can hit 5fps. Well those modes are more for 486 processors, …

Re: 15 FPS Doom 2 with Pentium MMX 200

Posted on 2022-10-18, 09:01

in DOS
Heretic/Hexen uses same Doom engine but it renders on RAM before copying it to the video card. Same for Duke 3D. That avoids completely the ISA bus bottleneck, thus making it much faster on your videocard.

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-10-17, 10:04

We'll I guess iD Software didn't care to port it to Amiga / Atari ST not only because of the planar video layout, but also because the 68030 wasn't fast enough compared to the 486. Those system's didn't have any kind of cache, which it's basic for Doom to perform well (I know the 68030 has 0.5Kb …

Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2022-10-16, 22:19

Well, I've finally finished the EGA 160x200 mode using Write Mode 1. I think it can be modified to do 320x200 in the same way, but with a reduced number of colors as there isn't enough VRAM available for the trick to work. Here are some tests with different EGA modes on a Trident Paradise EGA 8-bit …

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