Re: IBM PS/1 Audio Card.
Posted on 2011-03-29, 12:00
Hi! It's good that someone else is looking at this, I'm very busy just now. If I was to do it, it would be a while before I could start.
Re: Covox Sound Master / DMA issues.
Posted on 2009-12-11, 00:55
Oh! How did I miss this! :sweatdrop: Wow, a real CSM+ card! Thanks for the picture. I wonder, did it have a utility/demo disk included? 1 OPL2, no AY and a DAC at 0x330... strange, certainly unexpected. Impossible to tell if it has any DMA playing from the picture alone. Rigging up a test …
Re: Ps1 audiocard support
Posted on 2009-11-23, 01:13
Hi! I know we all secretly love PS/1 and early Covox sound. 😉 One day I will recover and be unburntout 😵 and will fix it all up and maybe even manage to add it to the proper source tree.
Re: Covox Sound Master / DMA issues.
Posted on 2008-07-13, 19:16
Maybe check out the games at http://www.mobygames.com/attribute/sheet/attributeId,80/p,2/ if you didn't already, and maybe test the win3x drivers for those cards. I had a look at the Win 3x drivers and, strangely, they didn't support DMA for the older cards! I've been on a busy work schedule for …
Re: IBM PS/1 Audio Card.
Posted on 2008-05-28, 22:25
It is possible that there could be subtle hardware differences, even some versions of the actual chip have been reported to have slightly different performance and white noise/feedback differences. Time for a test list of everything so far, including my observations and Myloch's. PS/1 Audio Card …
Re: Covox Sound Master / DMA issues.
Posted on 2008-05-27, 13:17
I recall reading once that one of the Alone in the Dark (2 maybe) games supported the Covox Sound Master Plus. or the Media Vision Pro Audio Spectrum Plus. In either case, this is delving into the truly obscure if this is the best we can come up with. I encourage full support for the non-FM Sound …
Re: IBM PS/1 Audio Card.
Posted on 2008-05-26, 12:17
Sorry, I was tired! :dead: "if the silver part marked 143NDK1X (near the 34-pin connector) is a 14.318180 Mhz crystal and we divide that by 4 to get the most likely master clock... then it would be 3.579545 Mhz." Of course, that is making an assumption, since I can't follow the tracks directly into …
Re: IBM PS/1 Audio Card.
Posted on 2008-05-26, 02:04
Thanks... Now, if the silver part near the connector marked 143NDK1X is a 14.318180 Mhz crystal and we divide that by 4 to get the most likely master clock... then it would be 3.579545 Mhz... which is the same as what I've got! (I copied it from the Tandy sound core). 😕
Re: IBM PS/1 Audio Card.
Posted on 2008-05-25, 19:05
Great, thanks, I can see what I'm emulating. :happy: Sadly, there are no chips on there that look like the SN chip or even a clone of it. Probably simulated with logic inside one of those bigger chips (I'm not a hardware expert). As for the crystal, the only thing that could be it is the blue thing …
Re: IBM PS/1 Audio Card.
Posted on 2008-05-25, 13:07
'm looking for some old tape recordings of Ps/1 songs I made when I was a little child (yes, I was a crazy maniac), if they are not lost in time, that could help. Dunno if it can help jmk, I have got some old ibm hardware pieces (one of them is the ps/1 audio/joystick card), I can snap some hires …
Re: IBM PS/1 Audio Card.
Posted on 2008-05-25, 01:02
Here is a new version which fixes skipping/repeating (bug in FIFO_FULL flag) and reduces "pops". Detection is better (as mentioned in a previous post) so it should help in certain cases where a game would decide to use the internal speaker for sample playing instead (e.g. Stunt Island). Further …
Re: IBM PS/1 Audio Card.
Posted on 2008-05-23, 21:45
One happy customer. :wink: Thanks for the testing, I've found that Stunt Island and Roger Rabbit 2 read port 0203 for proper detection. (Gets rid of the "I can't find the card, force it?" question on the installer). Also, Bush Buck reads ports 0205 and 0206 and expects both to return 0 if the PS/1 …
Covox Sound Master / DMA issues.
Posted on 2008-05-14, 23:06
I have been working on Covox Sound Master emulation... I am still trying to get to grips with the specs and how DMA sound works and so on, but I can play AY and samples with a few glitches and lock ups, depending on the game. The only game I've found that supports the AY8930 properly (duty cycles …
Re: LPT DACs in stereo
Posted on 2008-05-06, 12:49
The fact that there are a number of Covox cards does make things more confusing. :s-face: (All numbers below assume a base address of 0220). Some games support DAC at 022F (probably CSM+ and CSM II / Voice Master?). Some games support DAC at 0222 (CSM?). Finally, there seems to be a third method of …
Re: [patch] LPT DACs in stereo
Posted on 2008-05-05, 16:15
Unless of course covox parameter is for Covox Sound Master. I guess we won't know it without the possibility to check with a real card, or with original manual where it was explained. I may as well bump this old thread to mention that I've been looking into the Covox Sound Master and V1.0 of Prince …
Re: IBM PS/1 Audio Card.
Posted on 2008-04-27, 12:24
Ah... 🙄 Here's a quick grab of the "unabridged" src dir.
Re: IBM PS/1 Audio Card.
Posted on 2008-04-27, 00:49
OK, time is a bit limited for me (at the moment) so here is a build... dosbox.conf accepts the following new fields for this version: ps1audio=true ps1audiorate=22050 These two activate the IBM PS/1 Audio Card. It is always situated at ports 0200, 0202-0204, so there's no need for a "base" value. …
Re: IBM PS/1 Audio Card.
Posted on 2008-04-24, 00:59
If you want to hear Space Quest 4 with Tandy sound this is supported in the 16 color version of the game; from memory I think it also worked fine if you copied the drivers from the 16 color version to the 256 color version. Ah, I didn't know about that one. Scratch the "original content" idea. : …
Re: IBM PS/1 Audio Card.
Posted on 2008-04-22, 00:26
OK, thanks. The interrupt routine was trying to loop a sample by calling the "play sample" function again, which was resulting in a flag bit (which I assumed to be "confirm that the audio card caused the interrupt") to be low when the IRQ was reentered, which resulted in it calling the old IRQ …
Re: IBM PS/1 Audio Card.
Posted on 2008-04-21, 00:16
I thought I was getting somewhere... I got the PoP2 DAC playing and Space Quest 4 playing (with a bit of stutter - it doesn't use interrupts, just keeps on feeding the FIFO). But... get to level 2 on PoP2 and things go wrong. It plays a long sample then ends up with: "CPU:Illegal Unhandled Interrupt …
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