My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Emulation of old PCs, PC hardware, or PC peripherals.

My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby totalizator » 2011-10-16 @ 14:13

Hi everybody!

After I could not find any Covox to buy I've decided to build one myself. Here is the result: http://youtu.be/rKb1F-ApK3s and another video with more music http://youtu.be/x2iZFVoOq68.

Cheers!

Image
Covox (Stereo-On-1) LPT Stereo DAC - home made sound card by drhabber, on Flickr
Image
Covox (Stereo-On-1) LPT Stereo DAC - home made sound card by drhabber, on Flickr
Last edited by totalizator on 2011-11-08 @ 13:15, edited 1 time in total.
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby MaxWar » 2011-10-16 @ 16:22

Thats is very neat, and the thing sounds pretty good too, i am actually surprised, thumbs up!
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby Mau1wurf1977 » 2011-10-16 @ 16:58

Very cool!

Wish these DIY guides were available when I was a kid...

Any chance you could record a few DOS games?
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby Stull » 2011-10-16 @ 17:48

Perhaps the Doom E1M1 music? ;)
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby MaxWar » 2011-10-16 @ 17:52

Stull wrote:Perhaps the Doom E1M1 music? ;)


That would have been cool, but the Thing cannot play midi unfortunately :P
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby GXL750 » 2011-10-16 @ 22:47

I'm surprised at the way it sounds; quite nice. I would have expected a Covox to sound more or less like a Gameboy.

Where are the mod files from?
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby totalizator » 2011-10-17 @ 16:19

The links to download MOD files are in the video's description.

There is not many games to play with Covox and you can find gameplays from some of them on YouTube already (Pinball Fantasies, Wolf 3D).
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby Robin4 » 2011-10-17 @ 23:53

Make more and put them on ebay!!
~ At least it can do black and white~
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby Sol_HSA » 2011-10-20 @ 17:07

Well.. covox /speech thing is "just" a DAC bolted into the printer port, if I remember correctly. In any case there's no synthesis, so it sounds like the samples that are played through it, not like a gameboy.. =) Didn't know they come in stereo variety though.
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby Cyberdyne » 2011-10-20 @ 18:16

Ok I have a question for Dosbox developers and Covox maker, how do you make Wolfenstein 3D detect it as Disney Sound Soure, can i connect LPT pin 10 constantly to GND sufficient. Or is the detection mechanism more clever?
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby Cyberdyne » 2011-10-22 @ 22:18

Come on dudes, you made dosbox Disney Sound Emulation, and you can not give me istructions, how to make my covox behave like a Disney!
I am aroused about any X86 stuff that has full functional ISA stuff. I think i have problem.
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby h-a-l-9000 » 2011-10-22 @ 22:38

The Disney actually has a little FIFO buffer, a simple DAC isn't enough.
1+1=10
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby Cyberdyne » 2011-10-23 @ 09:25

That i know! But if you cheat your program to use Disney driver with Covoxer, the sound works, it only checks that the FIFO buffer is not full, and FIFO tells it to the computer by holding LPT pin10 low. If it goes high, then it does not send sound information. Am I right?
I am aroused about any X86 stuff that has full functional ISA stuff. I think i have problem.
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby h-a-l-9000 » 2011-10-23 @ 10:06

Detection routines vary between games, but typically they check that the FIFO reports full after a certain amount of writes, so yes they are more clever. The DSS also generates the sampling rate (FIFO emptying), so even if you trick it into being detected it will not sound correct, depending on the routine used by the game.


Come on dudes, you made dosbox Disney Sound Emulation, and you can not give me istructions


You assume that we are always reading every post?
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Re: My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card

Postby matze79 » 2018-7-10 @ 05:40

Does Auto Detection work with this one ?
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