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

Posted on 2023-04-04, 13:09

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by ViTi95

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The mock-up you've created looks very very well. I already did some dither testing directly in the colormap, and the result was no-where near good, but I think is possible to do something similar: The copy from backbuffer to VRAM is devided into blocks (Status bar, messages, border...), so we can …

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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 2023-04-03, 07:30

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by ViTi95

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FastDoom already supports CGA 160x100 16-color mode, and the upgraded ANSI from Hell 320x100 16-color mode 😁 https://youtu.be/_6Jft32G3ls https://youtu.be/ut0V1nGcTf8

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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 2023-04-02, 15:50

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by ViTi95

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New feature that will come to FastDoom 0.9.5, translucent invisible objects rendering (like Heretic and Hexen do) Filename dos4gw_024.png File size 42.99 KiB Views 1636 views File comment FastDoom 0.9.5 Translucent rendering 1 Filename dos4gw_005.png File size 39.71 KiB Views 1636 views File …

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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 2023-03-27, 20:36

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by ViTi95

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In my testing dithering only looks fine when higher resolution than 320x200 is available, otherwise small fonts become barely readable. That's why only 640x200 and 640x400 video modes have 0rdered dithering, with 2-to-1 or 4-to-1 pixel ratio without distortion. I didn't put much effort into creating …

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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 2023-03-27, 07:53

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by ViTi95

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Something i've been working on, Sigma Designs Color 400 support. 320x200 and 16 colors. It's possible to use 640x200 or 640x400 and 16 colors, but the card is already too slow, so no point on adding support for those. The VRAM layout is very similar to the Plantronics ColorPlus, but uses different …

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Re: HDD Clicker - HDD Sound Simulator

Posted on 2023-03-23, 21:57

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by ViTi95

in Marvin \ Sound

in Marvin \ Sound

ST-225 simulator 😂

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Re: Cirrus Logic GD5429 VLB significantly slower than a TSENG ET4000

Posted on 2023-03-21, 10:33

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by ViTi95

in Marvin \ Video

in Marvin \ Video

The issue with Cirrus Logic VLB cards is that internally use 16-bit design (for example a 32-bit write is converted to two 16-bit writes internally), so they only benefit from faster VLB bus speed. That's why those are usually slower compared to other VLB cards. The cards are paired with a DX4-100 …

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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 2023-03-15, 22:06

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by ViTi95

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New release! FastDoom 0.9.4. Changelog: - PCM music support. Up to 44.1 KHz, 8-bit mono music. For now PCM music is stored in RAM, so more than 16Mb is recommended - Tandy 3-voice SN76489 sound support. Sound quality is nowhere near good, but can be improved - Sound frequency is now selectable (from …

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Re: SAA1099 as 4-bit DAC and CMS/GameBlaster digital sound output

Posted on 2023-03-14, 17:15

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by ViTi95

in Marvin \ Sound

in Marvin \ Sound

Well I've solved the high pitched noise, basically I had an error on the LUT. I've been testing and the difference between setting the frequency to 0 or to 125KHz is pretty much the same (don't know exactly why, maybe on real hardware exists a bigger difference). The quality isn't very good (sounds …

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Re: SAA1099 as 4-bit DAC and CMS/GameBlaster digital sound output

Posted on 2023-03-12, 00:09

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by ViTi95

in Marvin \ Sound

in Marvin \ Sound

Maybe a bit off-topic, I reopen this asking for help. I've been trying to add support for ISA Tandy (SN76489) clone cards to FastDoom, but I haven't been able to make it sound "good". I don't have a real one, so everything I've done is tested on 86Box. Right now I'm using a LUT to do linear-to- …

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-03-06, 13:04

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by ViTi95

in Marvin \ Sound

in Marvin \ Sound

Great project!! I'll try it for sure. I wonder, could this project be expanded to add C/MS or Tandy support? Or even add a MIDI software synthesizer?

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Re: CRT Terminator Digital VGA Feature Card ISA DV1000

Posted on 2023-02-22, 07:20

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by ViTi95

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If I remember well, the Compaq QVision 1280 and the Compaq QVision 2000 had the VESA Advanced Feature Connector. Very strange port, similar to a SCSI 50-pin connector.

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Re: CRT Terminator Digital VGA Feature Card ISA DV1000

Posted on 2023-02-09, 12:58

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by ViTi95

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Really cool project, I'm really thinking of buying it. But I think it would be much better if the output video connector is an HDMI with audio passthrough added (or DisplayPort if you want to avoid the fee)

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Re: S3 Trio64 reference schematics

Posted on 2023-02-03, 12:47

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by ViTi95

in Marvin \ Video

in Marvin \ Video

Maybe this? http://www.bitsavers.org/components/s3/DB014- … ors_Mar1995.pdf http://www.bitsavers.org/components/s3/DB018- … rator_Jul95.pdf

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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 2023-01-31, 09:58

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by ViTi95

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Well some news about the Apogee Sound System GUS code, I've asked Jim Dosé if there was any source code available that uses hardware mixing instead of software mixing: 2023-01-31 10_52_21-Victor Nieto en Twitter_ _Hi @jim_dose ! We've found out that the Apogee Sound S.png Sadly there is no source …

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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 2023-01-28, 11:50

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by ViTi95

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The released source code of the Apogee Sound System is from 1996, take a look at the readme: https://github.com/videogamepreservation/rott … UBLIC/NOTES.TXT

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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 2023-01-27, 21:36

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by ViTi95

in Release Announcements

in Release Announcements

Yeah there is a limitation with the Apogee Sound System, it doesn't like GUS devices with IRQ higher than 7. I've never looked into why exists this limitation, but the developers did it anyway: GetUltraCfg(&os); if (os.forced_gf1_irq > 7) { return (GUS_Error); } Even more they disabled the hardware …

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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 2023-01-25, 09:00

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by ViTi95

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Just tested with OPTI930, everything is ok, -reverseStereo option reverses the channels correctly. I admire how quickly you solve problems. Thank you. Great to hear it's working now. I've been developing this project for so long that even on vacation without my laptop I already knew how to solve …

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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 2023-01-24, 22:12

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by ViTi95

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@Darmok can you try this dev build? The "-reverseStereo" option should be working fine now Filename FastDoom_0.9.4a.zip File size 808.88 KiB Downloads 59 downloads File comment FastDoom 0.9.4a (test build)

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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 2023-01-23, 14:55

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by ViTi95

in Release Announcements

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I guess the issue with -reverseStereo is that it forces to reverse the stereo setup, but SBpro code also forces it, so it's basically doing nothing. I'll modify the -reverseStereo option so it disables stereo reverse on SBpro cards.

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