VOGONS


First post, by COVOXED

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Hello. I have 4 circuit boards for the Lpt COVOX Stereo sound card (Wikipedia) and my intention is to be generous. 😀
Anyone who can contribute software development-wise, or in other way, thus helping to make the Covox to become even more useful under DOS, will be considered candidates.

The sound card is the absolutely most universal/compatible sound-card for vintage computers.
They are used on 8, 16, 32 bit computers of all imaginable kinds and platforms.
From the most exotic hardware to old laptops with no SB (or broken cards).

They can take the shape of very simple components connected to a cable going to the Printer Port (Priced 6 Euros) or it can be builds with vastly improved sound with good stereo DAC hardware. I have 4 of the latter ones but I am also interested in soldering the less complicated ones, in order to give away as well. The sound is actually not bad at all.

On my 486 laptop, 33mhz, 4mbRAM, DOS/Win3.11/Linux, it can give sound to Speech Synthesis, Games, C64 Emulation(!), Trackers (There are so many ppl still doing stuff on Fasttracker/ScreamTracker/MilkyTracker/ImpulseTracker. Btw, the entire IT source was released as you might know!). It can even be used under Virtual Sound Blaster emulation, (TSR) but not always successfully. Stuff supporting the "Disney Sound Source" and "Tandy" can also often be used. There is tons of old source code out there giving Covox support but mostly the emulator people (DOSbox and so on) have been taking interest in it, so far. Many of you probably already knows a lot about the stuff i'm writing about here.

With songs having a file size of 1.95 Kb (Youtube Link) or 38 Kb (YouTube Link), ram is not a problem. 😀 Neither is CPU.
Covox can really make good use of a old soundless computer.

This is how it actually sounds like from the simple LPT cable and from a LPT DAC Box.
Oh, and here is a Covox video on a IBM PC PS2 8580 (The later Stereo Covox developements, the ones i have, got much better sound than that).

Many cool things could work under Covox but software support is, up to now, not great. I have many ideas. But first, let me hear yours.
I will start assemble the cards in August 😀 As you will see on the link above on the Covox stereo page it is quite a bit of soldering work, but i look forward to it. 😀

(Today i also posted this on DOS ain't dead forum. In case this interests you, you might find something about this there as well).

Reply 1 of 5, by dr.zeissler

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What are you talking about? Dos/Emulators & CoVox?
My Covox is only for the EGA-Demo (SpacePigs), can I made a wider use of it? (Tandy?)

Sounds interesting 😀

Retro-Gamer 😀 ...on different machines

Reply 2 of 5, by COVOXED

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Yes dr.zeizzler. (Did you click on the wikipedia link?)
If you liked Spacepigs on Covox, you would also love Triton's Crystal Dreams Demos I & II.

Two thoughts:
1.
Maybe it would be useful with a Covox software compatibility thread in somewhere at Vogons?
So that people can add old proggies and games that they have managed to get working.
Where would be the place for it?

2.
For people who knows how to code under DOS it would be ridiculously simple to add support for Covox, thus making their stuff useful on everything that has a printerport.
Here is tons of various (old) source code (Pascal/C/ASM) that shows how to give Covox Support under DOS:
http://yandex.ru/yandsearch?text=covox&server … scal.Sources.Ru
joncampell123 has in his new audio player for DOS, Covox LPT DAC support. (Source):
https://github.com/joncampbell123/doslib/tree … 5/media/playmp3

I hope this will help for anyone who would like to help out with improving stuff for Covox Lpt Dac users.
I will consider to reward good contributions if anyone is interested in that.

Reply 3 of 5, by dr.zeissler

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The later Programs mostly support GUS that's why they don't need the Dac anymore.
A real cool MS-Dos Audio-Player has to play "AHX" files 😀

Retro-Gamer 😀 ...on different machines

Reply 5 of 5, by COVOXED

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The 4 Covox PCBs that I own has something that no other mono or stereo Covox in the world has as far as I know: Capacity for 16 bit Audio. The man who designed the card emailed me a picture that shows how that works, and said that he is happy to answer any questions if anyone would like to develop 16-bit software support for it.
Look at the picture: http://i.imgur.com/N2WWm70.png

Also the developer of Dosbox-x sent me a PM with helpful information about writing support for Covox that i will post here after asking for his permission.

What would be the coolest thing I could imagine at this time? A rewrite of the now opened source little driver for Lpt1 Covox Dac for Impulse Tracker would fit the bill. https://bitbucket.org/jthlim/impulsetracker The .ASM for the Covox driver is SMALL and is just really a tweaked PC-speaker source. (I have never been quite happy with it under Covox because of glitches in the sound). Stereo and/or 16 bit on Covox, for all vintage computers out there how does that sound? But that is just one idea. I am no coder myself and would like to hear what people that knows the trade has to say. Any coders out there?

There is activity about this topic on other forums.
Dosforum.de: http://www.dosforum.de/viewtopic.php?f=1&t=81 … tart=120#p53407
and on Dos Aint Dead: http://www.bttr-software.de/forum/forum_entry.php?id=14322

A bit of qualitative feedback anyone?