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

Posted on 2017-11-07, 19:28

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Another question here - AFAIK ROM legal status is still unclear now, so prototypes will not be equipped with onboard ROM I guess The legal status of the official 1 MiB ROM is very much known. With no less than three companies having copyrights on the data in that ROM, it would be just about …

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

Posted on 2017-11-05, 03:19

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

This will also be the last time I'll respond to _any_ requests regarding additional headers/breakouts for this prototype, unless related to the ROM circuit. You will get no more change requests from me before the prototype run. Of course, I already have every memory-related signal available, short …

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

Posted on 2017-11-04, 06:18

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Would it be a relatively simple matter to bring RAHLD# down to an unused pin of X3?

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

Posted on 2017-11-02, 03:21

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

EDIT4: Next proposal for the prototype: https://i.imgur.com/DMJOTFR.jpg Does Eagle have a feature that would allow you to produce a full-scale image or PDF of the ROM area, so that we can get a better idea of the placemment of X3, relative to other components? I'll wait a little while before …

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

Posted on 2017-10-28, 03:26

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

shock__ wrote: Should be possible. !CAS does not exist directly ... !BKSEL* gets 'translated' to that via the RAM select jumpers or would you need the explicit signals going to the SOJ/SIMM? I forgot about that. There is no need for an explicit CAS#, then. I should be able to work with the other …

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

Posted on 2017-10-28, 02:17

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Is there any chance of a small pin header near the SOJ chips to expose BKSEL0#-BKSEL3#, WE#, RAS# and CAS#? I expect you can figure out what I might want to tinker with (still). If not, I can always borrow the signals from existing footprints, but it would be a little unsightly if that design were …

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

Posted on 2017-10-28, 01:30

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Pulldowns for the SOJ-RAMs have not been implemented yet, I'll actually test those on one of the prototypes within the next few days first. If we're referring to the same thing, don't you want to pull CAS# to VCC to ensure the SOJ DRAMs aren't becoming inadvertently activated when the SIMM is …

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

Posted on 2017-10-28, 01:02

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

And guys. The possibility for a 4Mb ROM will make the whole project 500% more interesting. Please keep up the good work! Frankly, I have never heard MIDI playback from a device with a 1 MiB instrument bank that I liked. The only one that was anywhere close was the Soundscape S2000 and DB. From what …

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

Posted on 2017-10-27, 19:33

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Since there has been some discussion of the instrument sets lately, I thought I would provide a few more samples, for the sake of comparison. In this case, I have recorded the same MIDI file, with all of the same settings, recording and volume levels. I did not edit the resulting files in any way, …

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

Posted on 2017-10-25, 23:15

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Alignment like this? Might take a bit to even out all collisions, but might be possible. With the dual-row receptacle, I figured you could just elongate the pads, so that there is only a 4 mm gap or so between the rows of pads for the SOP chip. If you're set on the single-row receptacles, simply …

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

Posted on 2017-10-25, 19:51

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I have been forgetting to mention one thing that I found both interesting and disappointing: a few months ago, while looking over the ROMMaker source code, I had a theory that the SBOS chunk it generates has some limitations. Specifically, it only ever tries to map a certain number of instruments. I …

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Re: Gravis Ultrasound PNP ver. 1.0 - Sound OK, Music NO

Posted on 2017-10-25, 19:01

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Can you provide a little more information about your configuration? What other hardware is installed in the system? Which operating system(s) are you using? Is it real DOS or under Windows?

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

Posted on 2017-10-25, 18:50

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Elongating the pads sounds like a great option in my book, I didn't think of yet! That would certainly require less of an effort than the 42 pin socket (which would require a major re-routing for the SOJ-RAMs), while certainly cherishing the DIY-aspect of the project. You're speaking of SMD 1.27mm …

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

Posted on 2017-10-24, 20:27

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

As a last attempt I'm trying to add back the 42pin socket for the ROM. That would conviently expose all relevant pins on the ROM which would allow an in-circuit flash programmer daughterboard to be made. Getting there might take a few days tho. Unless you are planning a revised design later, I …

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

Posted on 2017-10-24, 20:01

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

If I'm not mistaken, is the RAS# line not connected to pins 33 and 45 on the SIMM socket? Given that the InterWave has only one RAS# signal, isn't that asking for trouble if someone happens to insert a dual-rank SIMM (apparently most common in 2, 8, 32 and 128 MiB SIMMs)? It seems like it would be …

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

Posted on 2017-10-24, 04:26

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I finally got to recording a few samples. The first is really just enough to show the revised drum looping. I obviously don't have it quite right yet, but I think it is less irritating than it was before. Breakout.mp3 The second shows off some of the other PPLT instruments. Jump_Bk.mp3 And lastly, …

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

Posted on 2017-10-21, 15:42

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

What version of GIPC are you using? Version 1.0 size is: 44,452 bytes Version 1.11 size is: 49,458 bytes I have been using version 1.11 exclusively. Can you re-check the file sizes? Mine is 49 548 bytes; if yours doesn't match, maybe I have a bad copy (seems unlikely, though, as I downloaded from …

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

Posted on 2017-10-21, 05:44

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

I had some time for a little more experimentation, and I am now confident enough to make a few conclusions: The ROMMaker, as it stands, is functional enough to do the job, and alignment of the wave data seems to be correct. GIPC, while somewhat buggy and sloppy, doesn't seem to be introducing any …

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Re: OPL2LPT

Posted on 2017-10-18, 17:27

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by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Thanks for the explanation! :) So I assume it's not possible to write a software-based TSR that uses polling method to monitor a given i/o port and then sends a copy of that data to another location ? There is no way to do that in software, especially on a 286 (or earlier). That's the reason every …

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

Posted on 2017-10-18, 05:51

by

by 640K!enough

in Marvin \ Sound

in Marvin \ Sound

Another member here, who shall remain nameless for the moment, generously acquired a board and sent it along for nothing more than the cost of shipping. This should make ongoing testing much easier. For the moment, I have removed the ROM altogether, and have been experimenting exclusively with RAM …

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