Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2017-01-11, 15:53

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

Adding Mark to the PCB / documentation is one of my least concerns :) Even tho the opt-in phase for the first batch is long closed I'd be more than happy to add anyone who has valid input for pushing the project further. $10 is what I'd consider a perfect compromise - it's cheap enough for a …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2017-01-11, 13:30

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

First of all thanks for the effort. Would be cool to see some GUS/GUSPnP history being revealed as an extra for this project. Kinda agree with Kodai - $20 doesn't seem like much at first, but would increase the current target price by 50%. I'm also kinda interested how this would turn out - …

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Re: Gallant SC-8000. What is that sound card and is it worth repairing ?

Posted on 2017-01-10, 21:44

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

No idea what may have happened there ... but this looks pretty bad. Might be salvageable with a ton of effort and/or potentially a replacement chip. Do you know anyone who could unsolder the rusty chip? If you can take a closer look at the underside and the condition of the pads it might be easier …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2017-01-09, 23:30

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

Just because I can solder smaller pitch stuff doesn't mean everyone who gets a card can 😉 Due to copyright issues everyone would have to be on their own to get a chip programmed and placed on the card as of now. That's a situation I'd like to ease up.

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Re: ISA bus extender using ribbon cable and passive backplane; max length of cable?

Posted on 2017-01-08, 14:55

by

by shock__

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Generally the shorter the better - also all cables should be the same length. Don't see 6" being overly long tho.

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Re: Is Windows pointless on a 486?

Posted on 2017-01-04, 13:07

by

by shock__

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No.

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Re: CVX-2 : covox adapter

Posted on 2017-01-03, 08:43

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

The Media Vision "Dongle" is highly complex compared to your average Covox-a-like tho. Sadly I don't have any pictures of the internals at hand but I think it basically came down to being a ThunderBoard on a LPT port instead of having an ISA interface. DigiSpeech DS301 board ... not your average …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2017-01-02, 16:44

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

Is there enough space between the top of the ram and the ICs ? I mean if you have a bigger module in height or you put a slot for DRAM. WPE2PN3.jpg Anyway the fact it is working is freaking awesome. Hats off shock. Clearances should be fine even when using double sided SIMMs. I strongly recommend …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2017-01-02, 16:33

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

So ... I found a circuit I could easily implement which uses IDE channels for programming(!) - sadly the software supports just 8bit transfers and is closed source (and has not been confirmed as working as of now). If one of you could reverse engineer the software part I'd be more than happy to …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2017-01-02, 08:19

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

I've looked into the 4MB ROM approach once again ... case in point, anyone up to soldering TSOP48 with a pitch 1.5x as fine as the InterWave? :) This certainly is overkill for the average hobbyist and something I'd have to teach myself first. After checking into it various times I think now is the …

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Re: CVX-2 : covox adapter

Posted on 2016-12-30, 13:28

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

For the sake of allowing you to compare: Crystal Dream 2 (44KHz - lowest quality available on my P120) recorded on my cheapass R2R Covox (made on breadboard) with a 4.7nF ceramic capacitor (something that's considered a bad practice) in parallel to the output. https://drive.google.com/file/d/0B9WAZV …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2016-12-30, 11:59

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

Another minor update ... after fitting other 3.5mm jacks on the prototype I can also confirm that backplates fit nicely. There's one small issue (see the gameport not being flush with the PCB?) but it does the job for now and fixing the placement there should be a piece of cake. http://i.imgur.com/ …

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Re: SB1.5, SB2.0, SBPro2, SB16 audio comparison.

Posted on 2016-12-29, 23:14

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

2.0

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2016-12-29, 12:03

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

Case in point if someone can figure out something how to make 4MB ROMSets running - I'll be more than happy to implement that in the series run, I'll provide one of the 3 Prototypes if required or an ordinary GUS PnP can be used for that as well (GUS PnP and ARGUS only differ in that regard in just …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2016-12-29, 11:22

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

There are a few minor issues remaining and I'd like to fix the 'pop on reset' issue first. I'm currently recording the Second Reality soundtrack on the ARGUS and a GUS PnP for a comparision. Cosmetic changes are of course possible and some minor ones will be done by me already. Personally I'm …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2016-12-29, 10:45

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

Wavetable ROM also working. Turns out I had a bad solderjoint on that chip. http://i.imgur.com/Lh4vDWV.jpg So all main functions seem to be working for now.

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Re: CVX-2 : covox adapter

Posted on 2016-12-29, 07:20

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

DSS can also have volume control via software as seen in Duke Nukem 3D I've seen a few implementations of Covox compatible R2R ladders in resistor network packages (albeit leaded) - even Konami did that at one point.

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Re: CVX-2 : covox adapter

Posted on 2016-12-28, 11:09

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

Also: some more reverse engineering stuff I did for the DSS - http://i.imgur.com/sMTdFhD.jpg (in German but I guess you could figure out most by guessing). The DSS programmer's guide actually has a simplified flowchart which shows the basic functions (which was the base I used for my compatible …

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Re: CVX-2 : covox adapter

Posted on 2016-12-28, 09:37

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

The mere reason for that latch in above schematic is for the stereo-on-1 implementation to select the active channel since the DACs don't have flow control (it offers stereo at the cost of double/half the sample rate). There's also a 1-chip implementation (I think the schematic is at the end of the …

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Re: CVX-2 : covox adapter

Posted on 2016-12-28, 08:26

by

by shock__

in Marvin \ Sound

in Marvin \ Sound

If you wanna go all the way, why not start here? http://cd.textfiles.com/thegreatunsorted/texts/txtfiles_misc/pcstereo.gif Has a latch + proper DAC + output amplifier (shouldn't be too hard to cut the circuit down to mono). The amplifier circuit isn't very good tho. EDIT: I actually have a schematic …

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