Re: PT4DOS - ProTracker for MS-DOS (very early alpha test)

Posted on 2022-07-18, 12:50

by

by 8bitbubsy

in Marvin \ Sound

in Marvin \ Sound

Rawit wrote on 2022-07-18, 12:48: [...] Will there be support for other codecs like WSS, ESS or PAS16? I don't own any of these cards, so I can't write a driver for them as it needs extensive testing.

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Re: USB ISA cards?

Posted on 2022-07-15, 07:42

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by 8bitbubsy

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is it possible to hack the non-LoTech board to enable 16-bit I/O? Or would that require a 16-bit ISA connector?

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Re: USB ISA cards?

Posted on 2022-07-14, 18:57

by

by 8bitbubsy

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Jinxter wrote on 2022-07-14, 18:33: 8bitbubsy wrote on 2022-07-14, 11:26: So, does it make sense to use the new 286 driver on a 486DX4-100? Will it work and give faster speeds? YES ! EPIC ! Will give it a try one day.

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Re: USB ISA cards?

Posted on 2022-07-14, 11:26

by

by 8bitbubsy

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So, does it make sense to use the new 286 driver on a 486DX4-100? Will it work and give faster speeds?

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Re: PT4DOS - ProTracker for MS-DOS (very early alpha test)

Posted on 2022-07-14, 08:35

by

by 8bitbubsy

in Marvin \ Sound

in Marvin \ Sound

Sample swap works like this: When the current playing sample reaches its end (either loop-end or the end of the non-looping sample), it changes to the new sample. So the swap should be delayed to the end of the current sample cycle. In other words, this has to be done on a mixer level, and not in …

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Re: PT4DOS - ProTracker for MS-DOS (very early alpha test)

Posted on 2022-07-13, 20:26

by

by 8bitbubsy

in Marvin \ Sound

in Marvin \ Sound

Hi, Interresting, i never heard about the live sample swap. Do you have files using it ? There are différent version of tracker on the amiga, with différence between them. Then I am not convinced there is only one way to play music. Sometimes, musician use tracker bugs to do a different effect. …

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Re: PT4DOS - ProTracker for MS-DOS (very early alpha test)

Posted on 2022-07-12, 21:00

by

by 8bitbubsy

in Marvin \ Sound

in Marvin \ Sound

Sweet! Going to give this a spin soon. How "Amiga" like does it sound? I guess it's wrong of me to say that it sounds like Amiga. It does nearest-neighbor resampling with no interpolation, so there's a ton of aliasing in the sound. To many people, this is considered awful and lo-fi like, but at the …

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PT4DOS - ProTracker for MS-DOS (very early alpha test)

Posted on 2022-06-17, 21:31

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by 8bitbubsy

in Marvin \ Sound

in Marvin \ Sound

I'm trying to port ProTracker to MS-DOS (386+, Sound Blaster 2.0/ Pro / 16). This is just a proof of concept for now, so the only thing that works is to load a module through Disk Op, then press Play or Stop (or change the BPM). It won't be "just another .MOD player" though, as the goal here is …

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Re: Mod Master XT 1.0 Released : Play .MOD, .XM and .VGM on a 8088 4MHz

Posted on 2022-06-17, 20:57

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by 8bitbubsy

in Marvin \ Sound

in Marvin \ Sound

4 channel mixing @ 30kHz on an 8086 8MHz without stuttering is really amazing. I'm also a bit amazed at how fast the 150kB module loads to RAM after you select it in the file browser. Feel like sharing the source code?

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Re: 8-bit VRAM write on a 16-bit ISA graphics card, fast or slow?

Posted on 2022-03-14, 10:11

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by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

Ok. Yes, I know it's half of the potential bandwidth, but sometimes I want to write a byte for alignment reasons (and when writing a font glyph to a bitplane, for example). EDIT: The reason I can't benchmark this is because I don't have a 16-bit ISA video card, I only have 32-bit VLB. Just in case …

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8-bit VRAM write on a 16-bit ISA graphics card, fast or slow?

Posted on 2022-03-13, 23:30

by

by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

Are there any penalties on writing a byte to VRAM (0xA0000) on a 16-bit ISA graphics card, e.g. will the system have to do something like a 16-bit read, insert byte into word, then a 16-bit write? Or can the CPU write a byte directly to a 16-bit ISA device without conversion? Seems difficult to find …

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Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected

Posted on 2021-12-16, 13:27

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by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

Update: Got my ISA Multi-I/O card, and now the machine boots with the S3 Vision864 card. I had to revert to the original VGA BIOS because I got corruption in some text-mode programs (like Impulse Tracker 2). By the way, the HDD read/write speed in DOS went from 4MB/s to 2MB/s when using an ISA card …

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Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected

Posted on 2021-12-08, 15:42

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by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

kixs: I flashed the card with your BIOS dump now, but it still doesn't post if the VLB Multi-I/O card is present, but it works fine without it (so the BIOS seems to be compatible, and I'll stick with it since it's newer). I'm getting an ISA Multi-I/O card for free from a friend. I'll update you in …

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Re: [miroCRYSTAL 20SD VLB] Looking for VGA BIOS dumps

Posted on 2021-11-28, 21:01

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by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

Thanks! I'll be sure to test the BIOS when I get my EEPROM chip in the mail.

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Re: Building a 486 DX-4: the Compatibility Machine

Posted on 2021-11-28, 11:34

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by 8bitbubsy

in Marvin \ System Specs

in Marvin \ System Specs

Here's a good tip for compatibility with old DOS games: Clock the CPU down to like 16-25MHz, and disable L2 cache.

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Re: Building a 486 DX-4: the Compatibility Machine

Posted on 2021-11-28, 11:09

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by 8bitbubsy

in Marvin \ System Specs

in Marvin \ System Specs

Nice system, though remember that AMD DX4-100 only has 8kB L1 cache vs. 16kB on the Intel DX4-100. That mobo text just sounds like an AMD advertisement to me (probably referring to the AMD P75 133MHz CPU). Also, using an ISA graphics card in a late 486 system should've been illegal! Wouldn't it be …

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Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected

Posted on 2021-11-26, 14:50

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by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

Try setting your bus speed to 25MHz and see if you get a POST with both cards at that speed. That could help troubleshoot the issue. I set FSB to 25MHz, still no post. Another interesting fact is that if I connect another VLB GPU while the S3 Vision864 is connected, the system posts, so it really …

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Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected

Posted on 2021-11-25, 20:38

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by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

There's a setting for VLB waitstates, and a setting for FSB (not for setting the FSB, but a jumper that needs to be set accordingly). My FSB is 33MHz, and waitstates is set to 0, and the Mhz thing is set to <=33. I have tried all possible combination on it, and it didn't help. However, I have not …

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Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected

Posted on 2021-11-25, 16:10

by

by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

No way, I already spent way too much money on this. It should be a solid performer once I get the system up and running.

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Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected

Posted on 2021-11-25, 14:15

by

by 8bitbubsy

in Marvin \ Video

in Marvin \ Video

I only use MS-DOS and Windows 3.11 without any VLB IDE driver, so yeah, this is a solution too. However, I want to try a different VGA BIOS first.

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