VOGONS


CVX-2 : covox adapter

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Reply 440 of 448, by Scali

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cvx4fanboy wrote:

Hello. I've got a CVX4 thing and cvxplay program. It does work and I can play sampleu.raw.
One thing I couldn't figure out yet is how to convert mp3 or wav to this covox raw format.
Could you please explain this to me?

You can use the free Audacity program for this: https://www.audacityteam.org/
Open your mp3 or WAV file, then use the Export function from the file menu. Export the audio as a mono 8-bit unsigned raw PCM file.

http://scalibq.wordpress.com/just-keeping-it- … ro-programming/

Reply 441 of 448, by matze79

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you can play mp3 directly on cvx4 without converter. (at least Pentium required..)

Requires CWSDPMI:
http://sandmann.dotster.com/cwsdpmi/

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Reply 442 of 448, by matze79

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if you want you can add Support to your Covox for FTL Sound Adapter.

Just adding a Wire gives you Sound in Dungeon Master.
Gave me some headattache but now i found out how it works..

Wire from Pin 17 to Pin 12 on your Covox Clone

ftl_hack.jpg
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And it works:
https://youtu.be/8-qID0qEmMs

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https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 443 of 448, by shock__

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Why would it? The FLT sound adapter is fully documented.
http://dmweb.free.fr/?q=node/1514 (schematic is kinda meh to read)

Current Project: new GUS PnP compatible soundcard

[Z?]

Reply 444 of 448, by matze79

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Uff did not read this 😀

https://dosreloaded.de - The German Retro DOS PC Community
https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 445 of 448, by Benedikt

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Speaking of the FTL Sound Adapter...

That device uses a 25.5kΩ load resistor and I reckon the Speech Thing uses 25.5kΩ, as well. I'm therefore going to use 25.5kΩ for my own replicas (new thread).
MobyGamer's measurements strongly support this assumption:

MobyGamer wrote:
Well, that was educational: […]
Show full quote

Well, that was educational:

CVX-1 Prototype: 5.04 vDC
CVX-2 Prototype: 4.80 vDC
10-pin Covox: 1.024 vDC
11-pin Covox: 1.025 vDC

With an input voltage of 5.04V and a 25kΩ load we should get an output voltage of
5.04V * (1 / (1 / 100kΩ + 1 / 25kΩ)) / 100kΩ = 1.008V

That is -1.5625% away from the 10-pin Covox and -1.6585% away from the 11-pin Covox.

With 25.5kΩ, however, we get
5.04V * (1 / (1 / 100kΩ + 1 / 25.5kΩ)) / 100kΩ = 1.02406374502V

That is just 0.0062% away from the 10-pin Covox and -0.0913% away from the 11-pin Covox. I'd call that bang on.

Reply 446 of 448, by matze79

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i`m working on a combatibility list of covox software:
https://dosreloaded.de/forum/index.php/Thread … liste/?pageNo=1

i test every piece by hand, so i`m 100% sure it works.

https://dosreloaded.de - The German Retro DOS PC Community
https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 447 of 448, by konc

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matze79 wrote:

i`m working on a combatibility list of covox software:
https://dosreloaded.de/forum/index.php/Thread … liste/?pageNo=1

i test every piece by hand, so i`m 100% sure it works.

That's great, I wish this forum wasn't in german 🤣
When you finish your project, could you also share the result here in vogons with a column on how to setup the application/game for covox?
eg Electro Man | setup option
Star control | cmd line param: /s:lpt<x>

Again, great idea

Reply 448 of 448, by matze79

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yeah thats the plan 😀

but first i go straight trough mobygames list.

https://dosreloaded.de - The German Retro DOS PC Community
https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer