Legacy audio driver for YMF7xx PCI cards.FIRST OF ALL============  This code references YAMAHA's sample codes and data sheets.  I respect and thank for all people they made open the informations  about YMF7xx cards.  And this codes heavily based on Jeff Garzik <jgarzik@pobox.com>'s  old VIA 82Cxxx driver (via82cxxx.c). I also respect him.DISCLIMER========= This driver is currently at early ALPHA stage. It may cause serious damage to your computer when used. PLEASE USE IT AT YOUR OWN RISK.ABOUT THIS DRIVER=================  This code enables you to use your YMF724[A-F], YMF740[A-C], YMF744, YMF754 cards. When enabled, your card acts as "SoundBlaster Pro" compatible card. It can only play 22.05kHz / 8bit / Stereo samples, control external MIDI port. If you want to use your card as recent "16-bit" card, you should use Alsa or OSS/Linux driver. Of course you can write native PCI driver for your cards :)USAGE===== # modprobe ymfsb (options)OPTIONS FOR MODULE==================  io           : SB base address     (0x220, 0x240, 0x260, 0x280)  synth_io     : OPL3 base address   (0x388, 0x398, 0x3a0, 0x3a8)  dma          : DMA number          (0,1,3)  master_volume: AC'97 PCM out Vol   (0-100)  spdif_out    : SPDIF-out flag      (0:disable 1:enable) These options will change in future...FREQUENCY=========  When playing sounds via this driver, you will hear its pitch is slightly lower than original sounds. Since this driver recognizes your card acts with 21.739kHz sample rates rather than 22.050kHz (I think it must be hardware restriction). So many players become tone deafness. To prevent this, you should express some options to your sound player that specify correct sample frequency. For example, to play your MP3 file correctly with mpg123, specify the frequency like following:  %  mpg123 -r 21739 foo.mp3SPDIF OUT=========  With installing modules with option 'spdif_out=1', you can enjoy your sounds from SPDIF-out of your card (if it had). Its Fs is fixed to 48kHz (It never means the sample frequency become  up to 48kHz. All sounds via SPDIF-out also 22kHz samples). So your digital-in capable components has to be able to handle 48kHz Fs.COPYING======= This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.TODO==== * support for multiple cards   (set the different SB_IO,MPU_IO,OPL_IO for each cards) * support for OPL (dmfm) : There will be no requirements... :-<AUTHOR====== Daisuke Nagano <breeze.nagano@nifty.ne.jp>