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

Posted on 2024-05-10, 12:12

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

Have a look here: Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest? The analogue part is in there. You can get the Interwave from the bay, albeit at scalper pricing.

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Re: Snark barker troubleshooting

Posted on 2024-05-02, 08:45

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

Just had a quick look at what I was using about 5 years ago: those were AT89S51-24PU which came from mouser. And they're actually still available there: https://www.mouser.de/ProductDetail/556-A89S51-24PU

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Re: Looking for IBM Music Feature Card owners

Posted on 2024-04-13, 21:41

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

florian3 wrote on 2024-04-13, 15:58: Thanks for the info. I don’t have anything slower than a 386 here. Will try to down clock that and see how it goes. Or stick to games. If you keep building, this could maybe solve it 😉 https://www.youtube.com/watch?v=g4OluJwGDEQ

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Re: The LlamaBlaster

Posted on 2024-02-19, 10:43

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

Indeed, looks great! And you're mighty fast in your project! Took me weeks to finish my card two years back. I actually also tried converting my version into rounded tracks a few weeks ago and that instantly made the DRC and Kicad crash. That issue has been fixed by now, though :) On a side note, is …

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Re: What retro activity did you get up to today?

Posted on 2024-02-08, 19:34

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by MJay99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

vsharun wrote on 2024-02-07, 13:26: Maybe fellow Vogons members point me the way to get Y1 in PM ? Are Y3 should be always powered on ? You could also try and ask Ian Polpo if he happens to still have one: Re: Need help repairing a Gravis Ultrasound Classic 2.4!

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Re: Problems with SB Pro 1.0 CT1330A

Posted on 2024-01-26, 23:14

by

by MJay99

in Marvin \ Sound

in Marvin \ Sound

Is this maybe what you're looking for? -> http://vogonsdrivers.com/getfile.php?fileid=6 … menustate=44,37

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Re: Snark barker troubleshooting

Posted on 2024-01-26, 23:09

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by MJay99

in Marvin \ Sound

in Marvin \ Sound

Just to be sure, since it could maybe explain all three cards having issues: all other ICs are oriented to the left, but is the DSP correctly insterted and facing with pin 1 to the right?

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Re: What retro activity did you get up to today?

Posted on 2024-01-14, 14:06

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by MJay99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does anyone know the name of these loops motherboards use for chipset heatsinks? They just look like standard 2.54mm headers but with a loop. I've tried searching mouser and aliexpress but can't find them. Searched through all the test points and headers. You can also find them as solder anchors on …

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Re: Voodoo 2 component map

Posted on 2024-01-08, 22:57

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by MJay99

in Marvin \ Video

in Marvin \ Video

You sadly got bitten by the metric / imperial issue: You bought them as 0603 metric (0201 imperial), which indeed are tiny: i-vs-m.jpg The intended 0603 (imperial) would just be a little smaller than 0805 and are still somewhat usable with a soldering iron. Edit: Oh well, too slow with my response 😄

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Re: ATX2AT Smart Converter - Live on Kickstarter!

Posted on 2023-12-20, 08:07

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by MJay99

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

ints99 wrote on 2023-12-19, 22:23: Hi! Could You please share the ATX2PC adapter PCB picture with OLED removed? You're going after an almost three year old post 😉 What information are you actually looking for, maybe someone can help, even without the image?

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

Posted on 2023-11-19, 10:39

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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

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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

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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

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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

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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

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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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