Re: The way to detect OPL3 clone

Posted on 2023-09-23, 09:44

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

wbc wrote on 2023-09-22, 19:33: ... was "LS245" clone on ALS100+ card and YMF71x/724, but other cards are always welcome), and have fun 😀 You probably meant LS262, because LS245 is a mere TTL buffer which is also present on your sound card and externally looks similar.

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Re: ARGUS Project thread - Now with gerbers and documentation in initial post!

Posted on 2023-08-15, 21:02

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

The scarcity was always going to happen one way or the other. It's happened to other chips before and it will happen to other chips after. Responsibility for that scarcity does not fall upon a few boutique makers at the very tail end of a given market. The modest wage (at best) provided by …

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Re: Can the SoundBlaster CT4520 (AWE64 Value?) be used as General MIDI in DOS?

Posted on 2023-07-26, 16:02

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

Yes it can be used. For DOOM you need DOS32AWE utility: DOS32AWE - DOS/4G compatible DOS Extender with Sound Blaster AWEUTIL MIDI synthesizer support for Protected mode,VIASB /REMOVED

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Re: PicoGUS: ISA sound card emulator with Raspberry Pi Pico (Gravis Ultrasound, AdLib, MPU-401, Tandy, CMS)

Posted on 2023-07-26, 06:30

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

polpo wrote on 2023-07-24, 00:53: The project is still open source of course... Are there plans to make it closed project I guess once it reaches some finished state?

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Re: PicoGUS: ISA sound card emulator with Raspberry Pi Pico (Gravis Ultrasound, AdLib, MPU-401, Tandy, CMS)

Posted on 2023-07-26, 06:28

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

Version v0.7.0 of the firmware has a much smaller default GUS audio buffer size of 4 samples, thanks to the higher RP2040 clock speed. If you run an older version of pgusinit.exe, it will set the buffer size to 16 samples, negating many of the improvements that this version brings for GUS emulation …

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Re: PicoGUS: ISA sound card emulator with Raspberry Pi Pico (Gravis Ultrasound, AdLib, MPU-401, Tandy, CMS)

Posted on 2023-07-01, 18:41

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

The 4.1 PSRAM speed seems to be from 20MB/sec to 60 MB/sec according to these topics: https://forum.pjrc.com/threads/70307-Ho ... -(reading) https://forum.pjrc.com/threads/68841-How-fast … 20clock%20speed.

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Re: PicoGUS: ISA sound card emulator with Raspberry Pi Pico (Gravis Ultrasound, AdLib, MPU-401, Tandy, CMS)

Posted on 2023-07-01, 17:26

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

@poplo Wouldn't the 600 MHz Teensy 4.1 solve many of your emulation problems? Yes, it is more expensive than the Pico but still affordable, especially when it comes to replacing GUS...

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Re: MUS-1099

Posted on 2023-06-05, 07:56

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

Has anyone kept the gerber files for the PCB? They seem to be deleted and no longer available for download...

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-04-23, 12:52

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

Different versions of QEMM (7 to 9 are usable for SBEMU) are available on REMOVED

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-04-19, 08:16

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

L4MD4 wrote on 2023-04-19, 00:03: To be clear, crazii is the SBEMU developer. I am just interested, in seeing the project flourish. My prediction is this project reached its peak and is already overblown.

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-04-05, 13:18

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

When writing SBEMU, I have to search & learn documents about SB to make it work. I think Gravis would be the same, I believe the documents/programming guides can be found on the web, but I'm not ready to to that right now. Maybe later when SBEMU is more stable & compatible. It'll be good if you can …

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-04-04, 12:24

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

EDIT: I think it's possible to write a 16bit protected mode wrapper that calls the 32bit TSR as interrupt service: just trapping the same ports and pass the commands, DMA addresses to the 32bit TSR and let it do the actual job. Thus recompilation of the soundcard drivers and OPL3 emulation can be …

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Re: Sound Blaster 16 (CT2940) PCM sound too quiet, FM ok [repaired: two MLCC cracked]

Posted on 2023-04-01, 13:34

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

Checked C99, C69 by live connecting in parallel 220nF capacitor without soldering and no FM sound is heard but I hear in the corresponding channel the mains interference so I guess the path to the output is fine including electrolytic caps and TDA1517P. Also tried replacing X3 crystal - no …

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Re: Sound Blaster 16 (CT2940) PCM sound too quiet, FM ok [repaired: two MLCC cracked]

Posted on 2023-03-31, 16:03

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

I have the same card with the opposite problem - does play PCM but not FM. Mine has YMF289B OPL instead of CQM...

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-03-25, 14:25

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

Interesting suggestion but I'm not sure yet how/whether it could be done, probably another io trapping of speaker port. You have to trap port 61h and PIT channel 2, so corresponding ports and behavior too. All trapped ports most likely should be passed to the real ports too. More info can be found …

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-03-20, 07:10

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

DOSBox emulates Gravis Ultrasound card and has source code for that too. Maybe it is time to add it into SBEMU.

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-03-19, 08:37

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

crazii wrote on 2023-03-19, 07:04: MPXPlay has ESS drivers but only for ISA cards (ESS18xx), and I didn't include the code in SBEMU because the ISA cards already have SB support. But they do not support SB16.

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-03-17, 19:45

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

DosFreak wrote on 2023-03-17, 17:12: There is no such thing as "abandonware". https://en.wikipedia.org/wiki/Abandonware

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-03-15, 08:30

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

The latency might depend on the game? With Duke Nukem 2 on a P3 I'm seeing maybe 50-100ms latency but less than I can properly notice for sound effects. ... edit 2: just observed latency for myself, it's particularly obvious in the menus of doom but far less apparent in actual gameplay The latency …

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-03-06, 03:19

by

by georgel

in Marvin \ Sound

in Marvin \ Sound

It would be interesting to dedicate a second CPU (core) where available to the emulation of the SB.

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