Re: SC8850 one easy mod, bring back the magic of sound

Posted on 2023-11-19, 10:39

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

99% AC-DC power adapters don't have fuse inside, neither do SC55 etc., did they catch fire? Please, don't state wrong facts and endanger other people: https://www.elprocus.com/fusible-resistor/ Apart from that, to everyone reading this, please just have a look at his other posts, then you know what …

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

Posted on 2023-11-06, 12:49

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

Almost like there is a data line that is bridged with it. I have been testing short circuit from that pin but all that I can find it connecting to is U5 pin 9. There must be something I am missing or not understanding. [...] I have checked all my work over a few times under the microscope and …

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

Posted on 2023-11-04, 22:23

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

It does indeed look like such an issue there, too. If all else fails (i.e. also the cap nop put on U5: https://www.vogons.org/viewtopic.php?p=1205683#p1205683), maybe it would be an idea to also try and isolate the corresponding pin from U5 (bend away, or kapton tape underneath pin 8, iirc) and …

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

Posted on 2023-10-26, 08:02

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

Will this one (photos) do? I used it to work with HDD firmware. [...] Using it with Book8088 might be not practical at all, so we can actually forget about this exact incompatibility :) I found similar devices on the interwebs and I'd say it should do (uses 3,45V and accepts up to 5V signals). The …

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

Posted on 2023-10-25, 21:06

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

3. 100nF capacitor on U5 chip: One blink on Pico, worked right away on Hand386, but not on Book8088. [...] Hand386/Book8088 w/o fix 3 - blinks many times in some kind of repeating pattern. Frequent blinking can be a sign of repeating resets. To really be sure it's the RUN pin issue, you could use …

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

Posted on 2023-10-24, 22:55

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

Just a quick question - does capacitor has to be exactly 100nF? There's some problem getting parts locally, so it would be great to know possible range. 100nF ceramic caps are the most common and generic decoupling caps, which is why I picked one of them and it happened to instantly fix the issue I …

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

Posted on 2023-10-24, 22:23

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

I am using it in a 486 without issues, I wonder if I should add the cap as well, you know, just in case.. If you ask me: If it works, it works... it was really just a hail mary attempt of mine, after it kept resetting itself consistently after a few seconds while I wasn't even seeing anything …

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

Posted on 2023-10-23, 21:19

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

Thank you! Could you share the photo of the fix, any quality? I'm bit on software side tbh, just to make sure i did that right. Sorry for the delay - here is the picture of what fixed my card (don't bother about the rest of the layout, I played and tested a bit with different routings and some …

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

Posted on 2023-10-23, 09:54

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

As a hail mary, I actually succesfully fixed the issue on mine with a 100nF cap (a through-hole one with legs) between the RUN and GND pin of the pico itself (should be 28 and 30), after I saw the pico reset itself mentioning the RUN pin as the reason (but not really seeing actual drops or huge …

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Re: ESS1868F ISA card, can't make wavetable sound work

Posted on 2023-09-03, 02:14

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

Wavetable daughterboard orientation isn't exactly rocket science. Find pin 1 on the sound card's wavetable header (it should be silk-screened on the PCB). Do the same for the daughterboard card. Now, orient the daughterboard card so that its pin 1 attaches to the pin 1 on the sound card's wavetable …

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

Posted on 2023-08-15, 21:15

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

And then there also is polpo's PicoGUS by now. Cheap to make and I'd say it is or at least is getting very close to the original also. So noone really needs to feel left behind about a GUS(-like) card now anymore.

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

Posted on 2023-08-11, 05:48

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

You could also try print the STL from this post ( or print and use it as a drilling template for a regular 9200-x keystone bracket): https://www.vogons.org/viewtopic.php?f=62&t=42431&p=1124979&hilit=bracket%20stl#p1124979 It's been a very long time ago, but I think to remember there were some …

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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, 16:00

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

@polpo: I've been toying with a first completely differently routed PCB for the pico, then just for testing, I also simply copied most of your routing into that card. But, both versions somehow kept continously getting rebooted by the RUN pin (as shown on the UART) and all of that, even though I …

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

Posted on 2023-07-25, 07:00

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

It's working with sound on 2nd reality on mine, but there is a repeating sample echo right in the intro tune. Still need to play around a bit and see if the older FW doesn't have that. Edit: It's in 0.6.1 also, so nothing new. Still needs some investigation if it can be remedied (bootup without any …

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

Posted on 2023-07-24, 16:57

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

P.S. PLEASE IGNORE THIS ---> for some reason the old firmware also does not output sound... Maybe the card developed some fault but initialize correctly and passes the ram verification tool I once had one of those DACs with a lost channel - ended up simply being a bad soldering of the connector …

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

Posted on 2023-07-24, 14:36

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

It's working with sound on 2nd reality on mine, but there is a repeating sample echo right in the intro tune. Still need to play around a bit and see if the older FW doesn't have that. Edit: It's in 0.6.1 also, so nothing new. Still needs some investigation if it can be remedied (bootup without any …

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2023-07-21, 10:46

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

dr.zeissler wrote on 2023-07-21, 10:29: Where can I get a ready to use version, I see only packages to compile ? Github has them under releases: https://github.com/crazii/SBEMU/releases

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Re: Best Sound card choice for Yamaha DB50XG or use with 2 card?

Posted on 2023-07-20, 08:48

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

Somewhere is cheaper version from it? You might need to verify if your DB50XG fits on this and if it really fits all your needs, but there is an adapted HARDMPU-clone with WT-header for self building: https://github.com/PickledDog/hardmpu-wt It's not a clone of Serdaco's, but based on a different …

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

Posted on 2023-07-20, 08:29

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

I've adapted my post to the edit of yours, so this doesn't cause even more confusion for others :) On your card (and everyone's, who got an older card version with similar reference placement): C9 (at the PSRAM on top) should be a 1nF and C10 (at the lower, smaller IC) should be 100nF. If it's a …

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

Posted on 2023-07-20, 07:49

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

The github image indeed says v1.1 but looking at my card (with a v1.1 marking also), the refs for C9 and C10 are swapped compared to this one, so it might show an already silently updated 1.1.1 variant... ;) But whatever the refs or bom says: the cap on the top, marked as C10 on the github image, …

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