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Re: Edsun CEG (Continious Edge Graphics) RAM DAC

Posted on 2023-06-30, 14:54

For CEG to work you need two things, one is obvious (the DAC itself), and second is that the software must have specific support for it. It requires initialization, and the VRAM layout changes depending on the CEG mode used. So it depends if the commercial software has support for it or not. Not …

Re: EtherDFS - a network drive for DOS

Posted on 2023-06-28, 22:04

I've found the issue, there is a problem while reading files that are uppercase in the server file system. For example, if the original filename is "FDOOM.EXE" it fails reading it, but if the filename is "fdoom.exe" then it works perfectly fine. I'll try to patch it. BTW, the WSL thing is just a …

Re: EtherDFS - a network drive for DOS

Posted on 2023-06-28, 16:19

I've been able to make 86Box to work with EtherDFS on my Windows based machine, but there are some issues. Basically I have a Debian WSL2 instance running on my Windows 10 laptop where I develop FastDoom. I've setup EtherDFS server to host my builds folder on the virtual WSL2 machine. 86Box runs on …

Re: EtherDFS - a network drive for DOS

Posted on 2023-06-28, 07:31

One question, has been tested EtherDFS with 86Box or PCem? I want to get rid of DosBox for develop as it's x86 emulation is inacurate, and I was thinking of using EtherDFS as a fast way to execute code on the emulator. Also, is it possible to modify the files on the server in realtime and will those …

Re: Edsun CEG (Continious Edge Graphics) RAM DAC

Posted on 2023-06-22, 23:29

I've been able to build the Abrash test code for the CEG, here is the executable Filename L1.EXE File size 29.48 KiB Downloads 31 downloads File comment Michael Abrash May91 executable and a link to a recorded video https://twitter.com/viti95/status/1672023500729507840?s=20. I know the video …

Re: Edsun CEG (Continious Edge Graphics) RAM DAC

Posted on 2023-06-22, 08:11

I've got and tested the EL171CEG chips today, and they work perfectly fine on my OTI-087X. Video output is a bit worse compared to the original MX86487PC, as black colors are now mostly grey. Very similar to what S3 Trio cards output. Now time to have some fun programming this chip, I'll update with …

Re: Pulling my hair out with EGA programming.

Posted on 2023-06-02, 06:39

In my testings write mode 0 and write mode 2 have very similar speeds, the main issue with EGA cards is the slow 8-bit ISA bus (~500Kb/s). The less you read/write to the card, the better. Write mode 1 is designed to do VRAM-to-VRAM copies, but you also can do the same with Write mode 2. The only way …

Re: Pulling my hair out with EGA programming.

Posted on 2023-06-01, 08:28

I'm trying to understand a bit the code, but seems a bit overcomplex just for writing a single pixel to EGA. With write mode 2 you just can set a single pixel in VRAM (or multiple): Calculate the address in VRAM Read the address so it's value gets copied in the latches (no need to store it in RAM) …

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

Posted on 2023-05-26, 08:23

If there is no sound card installed then there is no need to disable sound and music, it's already disabled. The issue comes when a sound card is installed and sound or music device selected. Sound cards use interrupts in order to work, and that causes sound code to be executed whenever the sound …

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

Posted on 2023-05-26, 07:48

The Cyrix 486 architecture is a little worse compared to the Intel 486, there are multiple instructions that are slower, that's why is usually slower. And the difference between Intel and AMD 486 comes when AMD had to remove the ICE code, I've seen slower performance on those "N" cpu's. Also the 8kb …

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

Posted on 2023-05-25, 15:09

Please @CODOR try this bugfix executable, I've tried it on my SB16 and it works now. BTW this executable includes a new configurable option, now it's possible to use render code for each CPU architecture. This allows for more performance on the selected CPU. The available command lines are: -umc486 …

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

Posted on 2023-05-25, 06:43

Ooops forgot to try the SB Direct mode + SB Midi, I'll take a look. Don't know if it will work though, both devices use the DSP so maybe they are conflicting. BTW it would be great if someone try the new SB Midi support with older cards, as I only have SB16 cards and I had to emulate on 86Box the …

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