CMI chips suck balls. That said, C-Media has a decent dos driver with the new software versions they had, so... that might fix it, it might not. It requires a bit of info about your board...
----- Original Message ----- From: "Eric Auer" <[EMAIL PROTECTED]> To: <freedos-user@lists.sourceforge.net> Sent: Wednesday, March 02, 2005 15:42 Subject: [Freedos-user] Question: How to use CMedia CM8738 sound in DOS? > > Hi, I am trying to make CMedia CM8738 onboard sound work in DOS. > The drivers (downloaded them) just find the PCI device, read the > IRQ and port base, check if PCI config register 4 "and 5 equals 5" > (if busmaster is on), does a bit of i/o > (base+4 = word e, base+18 = 3, base+16 = base+16 or 10, > base+21 = 5, base+27 = 1, 224 = 80, 225 = VALUE, 224 = 81, 225 = 22) > and hooks the PCI IRQ with a redirector to the selected NORMAL IRQ > (e.g. PCI sound chip triggers IRQ 12, and the TSR simulates IRQ 5 > when that happens). The base is found in PCI config reg 10 (low byte > of word ignored), the IRQ is in PCI config reg 3c. The device is > found by scanning the PCI bus for a device by vendor 13f6 (CMedia, I > assume) or 10b9 (in THAT case, the device ID is also checked to be > in 100-200 range. However, in my case, the ID is 13f6:0111). > > Whatever. Everything nice and techy. The more clever DOS programs > even "work" with selecting IRQ 12 directly without the TSR in RAM. > But only Adlib and mixer REALLY work. When I try doing 8bit sound, > I get silence, and for 16bit sound, using DMA 1 for both high and > low DMA channel (hardcoded to the setaudio CMedia tool, it seems), > I get noise. Very annoying. > > Am I doing something stupid here or is it just a KNOWN problem that > C-Media sound chips have crappy DMA and therefore can only be used > for boring Adlib sound in DOS? > > I think I have read of other people with C-Media on this list before, > so maybe somebody can help me out here. Thanks! > > Eric > > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > _______________________________________________ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
