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

Posted on 2017-12-06, 17:42

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I've been doing a little more testing on my flash programming software, along with a salvaged guinea-pig 29LV160. I haven't added support for the "fast mode" supported by some variants to reduce programming time, but I can successfully write the contents of a ROM image to the chip and verify it. I …

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

Posted on 2017-12-04, 22:57

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

matze79, I'm under the impression that this is a small run of the board prototype for the smart guys to test and work out the kinks (if any) with. At least I hope that's the case, as I donated to qualify for a card on the production run. That's correct; this is just a prototype run for additional …

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Re: OPL2LPT

Posted on 2017-12-02, 15:11

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by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Just run it on the PS/2 P70 and I get: Parallel port(s) found: 1 LPT1 3BCH standard (output-only) I'm a little surprised that the first parallel port is configured to use 3BCH; I thought that was only on even older machines. I looked at the source code to the TSR early on, but don't remember if it …

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Re: OPL2LPT

Posted on 2017-12-02, 05:07

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I find it interesting that there can be so much variation in parallel port behaviour from one machine to the next. I have attached a newer version of the detection tool. On my machine, it correctly identifies EPP mode, regardless of version. With the previous version of the tool, EPP 1.9 was …

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Re: OPL2LPT

Posted on 2017-12-01, 18:52

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

640K!enough: I get "LPT1 378H ECP". Since you're the developer of the TSR, would it be correct to assume that the device works consistently on your hardware? I will need to add a few more lines to the ECP routines and fix the EPP detection, but I suspect that the problems are related to the type of …

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Re: OPL2LPT

Posted on 2017-12-01, 07:58

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Still doesn't work on the PS/2 though. This has me curious. Can you try the attached detection tool I wrote and post what it reports? It would be interesting to compare the results from machines on which the device works, too, if anyone is willing to try. It might be a good idea to unplug any …

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Re: Anyone interested in Yamaha OPL4 Wavetable modules?

Posted on 2017-11-30, 17:33

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I was interested in this idea when I saw the thread, but it only has a 1 MiB instrument bank integrated, and I'm not sure about effects processing. Those expecting synthesis quality similar to the Audiotrix Pro or Miro boards will likely be disappointed. If it were cheap enough, I might still …

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

Posted on 2017-11-29, 21:50

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Hello.. I would be interested in this! Just saw the thread. But I can't find who to contact to get in the list. Is it too late? I believe it is too late. From my understanding, it is only open to those who contributed financially during the donation period (now closed), or made a technical …

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

Posted on 2017-11-21, 20:49

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Noise on the bus was causing the #CS to (very weakly) toggle repeatedly and quickly. This caused the chip to repeatedly perform back to back read/write operations -- out of specification operation. I expected something similar to be the cause of the problems I was having, particularly since one of …

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

Posted on 2017-11-19, 19:42

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I made a few more modifications to the circuit as a trial, and got it running again. I don't have time to sit around listening to MIDI files for hours today, so I can't test thoroughly yet, but I did have a chance to make a few recordings. The MP3 file contains recordings of two MIDI files; the …

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

Posted on 2017-11-19, 16:09

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I take that back; the ROM module is not dead, but its behaviour is somewhat peculiar. Usually, if left long enough, it seems it will work another few hours before the symptoms re-appear. I will have to investigate the source of the problem, but should still be able to provide a few recordings a …

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

Posted on 2017-11-18, 19:59

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

It looks like I was right about the solder joint. The chip on the underside of the board must have had a few pins that weren't as well soldered as they should have been. With that problem rectified, it worked as one would expect, producing clean, distortion-free sound. This is what the UltraSound …

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

Posted on 2017-11-17, 20:42

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Just thought I'd share a preview of something that I'm working on: GUS-PnP-with-daughterboard.jpg It is still a work-in-progress, but it is detected properly and does produce MIDI playback. The playback is perfect on some instruments, and distorted with others. My current suspicion is a questionable …

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

Posted on 2017-11-17, 10:28

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

It is worth noting that that particular 16.9344 MHz crystal has a minimum order quantity of 1000.

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Re: Some games don't detect SB II Compatible sound card

Posted on 2017-11-13, 19:33

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Sometimes, it also helps to set 8- and 16-bit I/O recovery time as high as they will go on such systems, assuming you have such a setting. Try experimenting with different values to see if it helps.

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

Posted on 2017-11-13, 16:40

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

The traditional GF1-based cards don't have a ROM, but it isn't really required to make an initial contribution to testing the board; they work just fine with no ROM at all. The obvious exception would be software that specifically checks for the presence of a ROM. All software that uses GF1 …

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

Posted on 2017-11-09, 18:20

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Yup :) wbcbz7 has written a RAM/ROM dumper for InterWave cards, meaning one can get the ROM contents read from their InterWave based cards without the need to unsolder the IW78C21M1 chip. There's a version in this thread somewhere dated 1.3.2016 which dumps the full 16MB RAM and ROM space and a …

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

Posted on 2017-11-09, 05:37

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

(Hello everyone, I'm back from the dead!) I called up Eye & I Productions a long time ago when this project started up, since I live in the states and its much easier to have a phone-conversation than email. The guy was very excited about this project, and seemed to really enjoy that people still …

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

Posted on 2017-11-09, 05:09

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Sorry to hear that. Any chance owners of a real GUS PnP can personally flash the 1MB ROM image, just like using one's MT-32 ROM for MUNT? The 1MB ROM on my GUS PnP clone is very useful and sounds pretty good. It is probably because my GUS PnP clone has a 512kB limit on RAM, that the ROM is often …

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

Posted on 2017-11-08, 19:58

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

shock__ wrote: Currently there'd be 3 people interested in a prototype (that is including me) ... is interest seriously that low? Up to this point, how many cards do you expect to need for the prototype run? Do you have a ballpark per-unit cost estimate yet?

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