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

Posted on 2024-04-09, 22:11

by

by digistorm

in Marvin \ Sound

in Marvin \ Sound

Now you have Sound Blaster working, would it also be possible to create a firmware for Covox / LPT DAC emulation? It would make this Swiss army knife even more Swiss army knifey 😉 There should also already be emulation code available in DOSBox etc. why do You need Covox emulation? much more fun can …

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

Posted on 2024-04-08, 09:11

by

by digistorm

in Marvin \ Sound

in Marvin \ Sound

Now you have Sound Blaster working, would it also be possible to create a firmware for Covox / LPT DAC emulation? It would make this Swiss army knife even more Swiss army knifey 😉 There should also already be emulation code available in DOSBox etc.

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

Posted on 2024-03-28, 08:09

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

@polpo: Do you know how often you can flash a different firmware until the chip wears out? Would it be harmful to for example make batch files that change the picogus firmware before launching a game?

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Re: Retro Rig Photo Thread

Posted on 2024-03-18, 14:05

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by digistorm

in Marvin \ System Specs

in Marvin \ System Specs

Goteks and front-loaded CF adapters are super useful. I only miss the floppy drive sound. Someone could make a floppy sound emulator, like they did with the HDD clicker. My next Gotek will probably come with an OLED. You can connect a small piezo speaker to a GoTeK drive with the Flash Floppy …

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

Posted on 2024-02-28, 21:04

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

Is it a DX/50 and not a DX2/50? With a 50 MHz bus, ¼ might still be too fast (12.5 MHz). You might try a divider of ⅕, the latest firmware has been tested with 10 MHz ISA bus speed.

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

Posted on 2024-02-20, 11:44

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

I think the classic GUS had a less aggressive output filter. It starts a bit earlier to filter out the highs and it leaves more in. The DAC in the PicoGUS sounds more like an Interwave card, which seems to have more of a brick-wall filter. I think in DOOM the aliasing is not that disturbing because …

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Re: DiskClick! Emulate Old Hard Drive Sounds using your own Real life C drive.

Posted on 2024-02-20, 09:06

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

I don’t know how the software actually works, but for me the biggest disadvantage to this kind of software (and the Clicker from Serdashop) is that they do not distinguish between 100% disk seeks (from first to last sector) and track-to-track seeks. The latter at often almost inaudible and/or …

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

Posted on 2024-02-17, 07:52

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

I would not mind a constant output rate - especially as an option in PGUSINIT - because it provides a functional enhancement to the sound quality. Also, as a composer of those days, I think I can say it felt like a compromise or a necessity to accept less fidelity to have access to more simultaneous …

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

Posted on 2024-02-04, 07:43

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

When does it click exactly? With what program? My genuine GUSpnp always makes a few clicks during initialization when I run IWINIT or UNISOUND.

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

Posted on 2024-01-29, 20:50

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

What would you consider good test cases out of all those demo's and games to find out if it's stable? Or what could be used to stress test it, if that even makes a difference?

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

Posted on 2024-01-28, 21:38

by

by digistorm

in Marvin \ Sound

in Marvin \ Sound

digistorm go into bios and play with ISA clock settings Well. I tried to give it a go, although it is a complete pain because it sometimes takes 5 minutes before the demo crashes 😉 I have a Cyrix DX2/66 running at 40 MHz FSB making a 80 MHz effective clock. During these tests I had the divider at ⅕ …

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

Posted on 2024-01-28, 14:15

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

I decided to also test Crystal Dream II with the CPU at stock settings (66 MHz, 33 MHz bus, 8.33 MHz ISA bus) but it stalls in exactly the same way and in the same spot. Just to rule out that the board didn't like 40 MHz for some reason although I thoroughly stress-tested it.

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

Posted on 2024-01-27, 19:43

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

ill try this demo on my 486 opti chipset, can you describe the problems? The demo's of Triton hang randomly in the way, that the playback routine seems to stall but the effects go on. If the demo code doesn't wait for a cue from the module and it loads a new song, it is fine. If it does wait for a …

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

Posted on 2024-01-27, 14:51

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

@polpo: I am still experiencing issues with Crystal Dream II in combination with my 486 mainboard (SiS 85C471 Socket 3). Would you want me to include it in a compatibility report or do you have ideas to investigate further? It seems that only software from demo group Triton suffers from an …

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Re: Multiple computers, one set of speakers.

Posted on 2024-01-25, 06:12

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

Are passive mixers safe? I was always told you shouldn't directly connect the outputs of two different audio devices. Those passive mixers will probably be safe because they don’t just connect the outputs together. There is enough resistance between the input and the point where they are all joined …

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Re: Cubic Player and GUS

Posted on 2024-01-20, 16:28

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

Digistorm, would OpenCP be advised for a 5x86 160 over the older CP versions (1.6 is from 1995, I believe)? DOS 6.22, ISA GUS. You could run it even on a 486 DX/2, but in the case of software mixing you have to change the ini file because by default OpenCP uses the FPU to do the software mixing and …

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Re: Cubic Player and GUS

Posted on 2024-01-20, 09:06

by

by digistorm

in Marvin \ Sound

in Marvin \ Sound

Cubic Player will make the samples smaller one by one, using some algorithm to guess which sample has the least impact, and it does this in the following way: First it finds all 16 bit samples and reduces them to 8 bit (only as long as it doesn’t fit in memory) Then it reduces the sample rate (and …

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

Posted on 2024-01-07, 17:11

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

Did you install the Ultrasnd files and set the correct environment variables in AUTOEXEC.BAT? Some of those games need ULTRAMID to be working and the correct path to be set.

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

Posted on 2024-01-07, 15:58

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by digistorm

in Marvin \ Sound

in Marvin \ Sound

I don't know if you already checked (but it wouldn't hurt)… at what IRQ do you have the PicoGUS set and are you sure it is not used elsewhere?

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Re: SB PnP 32 CT 3620 and DOOM 1 sound issue

Posted on 2024-01-07, 07:38

by

by digistorm

in Marvin \ Sound

in Marvin \ Sound

On a DX/2 the bus would be running at 33.3 MHz and so also the PCI bus. /4 is a normal divider for a 33 MHz bus and would result in 8.33 MHz ISA bus.

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