Re: Covox Sound Master Reverse Engineering / Replica

Posted on 2015-02-18, 19:58

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

The original Pro Audio Spectrum would be possible to reverse if John Neary had and could give us all the necessary information. Like shock said, a lot of custom chips in there and with quite a few GAL's as well. With no help, the amount of work would be too great. An AdLib Gold clone would be …

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Re: Covox Sound Master Reverse Engineering / Replica

Posted on 2015-02-18, 13:23

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

Stiletto wrote: Very curious to see if anything comes of this. 😀 Most likely nothing will.

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Re: Innovation SSI 2001 re-engineering and/or conclusions

Posted on 2015-02-14, 14:00

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

Fagear wrote: Nope. As long as it is "SSI-2001 replica" it uses the same 1nF caps as the original board did. As well as SID clock is set to 0.89Mhz by default. You can modify your board as you want. OK i assume then that the default filtering capacitance is perfectly safe and won't damage the SID …

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Re: Programming... Would appreciate some advice from the experts and ideas for a simple DOS tool.

Posted on 2015-02-14, 11:36

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by carlostex

in Milliways

in Milliways

A little more ranting: I mostly would prefer writing code in C++ than in C i think. For someone who just started learning programming the console input/output in C++ is just better to understand and easier to work with IMHO. The way the operators >> and << can be used in C++ make the usage of …

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Re: Innovation SSI 2001 re-engineering and/or conclusions

Posted on 2015-02-14, 03:14

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

Fagear wrote: carlostex wrote: What's the difference between C64/6581 and DS/6581? C64 - filter capacitor values from Commodore 64 schematics. DS - filter capacitor values from DataSheet. I assume that you used C64 values then for my board and everybody else with 6581's, right?

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Re: Innovation SSI 2001 re-engineering and/or conclusions

Posted on 2015-02-14, 00:21

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

This may be a stupid question but... What's the difference between C64/6581 and DS/6581? I'm asking cause i ordered 2 6581 SID's. One is a 6581 and the other is a 6581R4. Does this mean that not all 6581's are equal and need different filtering caps? How will i know what is the correct 6581 for my …

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Re: Covox Sound Master Reverse Engineering / Replica

Posted on 2015-02-12, 16:55

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

For the GAL, I haven't had time to check into it yet, but as I said above, it looks like it might only be used for address decoding, which would simplify the whole thing. Because if that's the case, we don't need to figure out how the GAL is programmed but simply add logic ICs to do the same job. …

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Re: Covox Sound Master Reverse Engineering / Replica

Posted on 2015-02-12, 10:45

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

Well we are totally dependant on Yvan, since he is the only person with a card that we could find. If Chuck(G) from VCF would agree to dump the GAL and Yvan would agree to send him the board for this purpose the GAL problem would most likely be solved. Unless of course Yvan can do it himself, which …

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Re: Humour Thread: Outrageously priced retro gear for sale online

Posted on 2015-02-11, 22:03

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by carlostex

in Milliways

in Milliways

Artex wrote: Does eBay "buyer protection" kick in when the buyer complains that it's... (wait for it...)... not haunted? 😒 There's enough people in the world who believe in this kind of crap so i wouldn't be surprised if such a thing would happen...

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Re: Covox Sound Master Reverse Engineering / Replica

Posted on 2015-02-11, 21:27

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

Let's hope that he can help us. At the moment I see some problems: 1) Not enough information about traces under ICs (the same as was for SSI-2001 replica) 2) PAL/GAL with unknown functionality 3) Mounting bracket, once again. With SSI-2001 I've managed to get out with re-designing the board to be …

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Re: Covox Sound Master Reverse Engineering / Replica

Posted on 2015-02-11, 17:29

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

Good news! I contacted Nick Skrepetos on facebook a few months ago. I was not sure he was the Nick Skrepetos who worked for Covox but since this person was from Eugene, Oregon i thought it was worth the shot. Well he replied to me yesterday, confirming he is the Nick Skrepetos who worked for Covox. …

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Re: Crusty Desktop AT Pentium

Posted on 2015-02-11, 12:53

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by carlostex

in Marvin \ System Specs

in Marvin \ System Specs

The 4 ISA slots and the soundcard choice have my seal of approval!! Actually, i would recommend you to install the WIN 3.1 driver for the YMF-718 card. It brings a more recent DOS driver. I suppose the standard DOS driver is version 2.09 and the one that comes for WIN3.1 is 2.11. I used to complain …

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Re: Programming... Would appreciate some advice from the experts and ideas for a simple DOS tool.

Posted on 2015-02-11, 02:18

by

by carlostex

in Milliways

in Milliways

Skoynay wrote: Disk image mounter? That's a good idea for a DOS tool. Would cerainly be very useful. Probably too hard for me.

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Re: Northwood HPTC full of ISA soundcards

Posted on 2015-02-09, 10:22

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by carlostex

in Marvin \ System Specs

in Marvin \ System Specs

I'm wondering how slow you can get this system to be. What is the lowest multiplier? Can you disable caches? I guess you're not worried about this since this is a late DOS\Win98 build...

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Re: Innovation SSI 2001 re-engineering and/or conclusions

Posted on 2015-02-09, 10:08

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

I think too that was a mistake to put the PCI picture. Screws on the bracket will be located on the top side (while ISA needs them at the bottom) And the orientation of the db15 port is inverted too. It can still work though, if the db15 opening in the bracket is wide enough, and you hold the …

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Man spends £300 on a laptop on eBay – only to be sent a photograph of it

Posted on 2015-02-04, 20:27

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by carlostex

in Milliways

in Milliways

This is crazy shit: http://home.bt.com/tech-gadgets/tech-news/man … -11363959688500

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Re: Covox Sound Master Reverse Engineering / Replica

Posted on 2015-02-04, 02:34

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

Thanks, but it doesn't give much more information. Shallow angle and better focused image would help. Now I copied almost every visible track (not including filled polygons). And wrote down values of all resistors. http://fotkidepo.ru/photo/229919/46283k6000wyFJs/1053463.jpg Amazing work Fagear. 8)

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Re: Innovation SSI 2001 re-engineering and/or conclusions

Posted on 2015-02-03, 14:17

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

I need my card set to 6581 btw

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Re: Innovation SSI 2001 re-engineering and/or conclusions

Posted on 2015-02-02, 19:09

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

I wouldn't say it's impossible; it's just not as simple as leveraging EMM386's port-trapping capabilities in a manner similar to SoftMPU, as I'd suggested earlier. It does seem like TEMU's redirection could be used as a model... OK, i took a look into TEMU's documentation included with its source …

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Re: Innovation SSI 2001 re-engineering and/or conclusions

Posted on 2015-02-02, 10:16

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

NewRisingSun let me know that EMM386 will not allow port trapping in the 00h-FFh range, thereby precluding it from being used for the Tandy sound redirection. Presumably, JEMM and QEMM have the same restriction. :depressed: Really? Then does the Tandy 1000 RSX have a limited compatibility with …

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