Re: Support for YMF724 soundcards?

Sonata Kyuu (sonata@softhome.net)
Sun, 06 Dec 1998 00:54:06 +0900

Scott Murray wrote:
> On Thu, 26 Nov 1998, James Best wrote:
>
> > I, too, have looked into writing a driver for this chip family. As mentioned,
> > the PDF documentation online is unreadable, and I have contacted Yamaha about
> > reciveing a hardcopy.
> > I was unable to get my card operational with the oplsa2 driver, though I will
> > have more time this weekend to play with it.
>
> Thanks to Richard Tobin (richard@cogsci.ed.ac.uk), who pointed me to the
> file:
>
> http://www.imail.net.tw/qtronix/driver/qumax/yamaha/ds1e1110.pdf
>
> From looking at the contents, the YMF724 is quite different than the YMF711
> (OPL3-SA2) and 715 (OPL3-SA3) chipsets.
[...]
> After skimming through the specs some more, there seems to be enough there
> to maybe allow getting the SB Pro (such as it is), OPL3, and MPU-401 up and
> running, but it probably will involve quite a bit of PCI coding. As for the
> using the real functionality of the card, there's no actual documentation on
> that in any of the PDF files I've poked around in. :( I am intrigued a bit
> by the technical specs; the chipset has the ability to support SPDIF
> connections and is AC-3 enabled. What does a soundcard with one of these
> on it cost?

I have done a little bit of experiment with an Atrend card that is
YMF724-based. I can use the supplied DOS-utils (which uses dos4gw, FWIW)
to config the card in DOS and then use loadlin to boot linux; then I can
load the sound modules (sb.o & opl3.o) and they work. I can use the mixer
and get FM sound. However the sb pro emulation part only does 8-bit
output and I don't have a program to test it, but I think it will probably
work.

If I cold boot the system, the YMF724 is not enabled; the sound modules
will not load as they cannot detect the hardware. Using setpci to set up
PCI reg 40/41h enables the chip so that drivers will load. I believe reg
48/49h (DS-1 control Register) and 54/55h (Power Management
Control/Status) should be set as well. However, I do not know how to
setup the separate 16-bit codec, so no sound come out. The codec on my
card does not seem to be AC2 mentioned in the 724 data sheet. The marking
says:

STAC97041
LA4L64
9832

The logo is an overlapped sigma and a T. Any idea?

BTW, is AC97 a functional spec or an API spec? Do AC97 codecs has a
standard programming interface? 'cos that's what I suppose the above is.

And yes, the YMF724 has a build-in XG synth (but needs 32k external main
memory) but the pdf file does not contain programming info for it.

I will try to experiment with it a bit more.

Stephen

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