linux/Documentation/sound/oss/PSS
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   1The PSS cards and other ECHO based cards provide an onboard DSP with 
   2downloadable programs and also has an AD1848 "Microsoft Sound System" 
   3device. The PSS driver enables MSS and MPU401 modes of the card. SB 
   4is not enabled since it doesn't work concurrently with MSS. 
   5
   6If you build this driver as a module then the driver takes the following
   7parameters
   8
   9pss_io.         The I/O base the PSS card is configured at (normally 0x220
  10                or 0x240)
  11
  12mss_io          The base address of the Microsoft Sound System interface.
  13                This is normally 0x530, but may be 0x604 or other addresses.
  14
  15mss_irq         The interrupt assigned to the Microsoft Sound System
  16                emulation. IRQ's 3,5,7,9,10,11 and 12 are available. If you
  17                get IRQ errors be sure to check the interrupt is set to 
  18                "ISA/Legacy" in the BIOS on modern machines.
  19
  20mss_dma         The DMA channel used by the Microsoft Sound System.
  21                This can be 0, 1, or 3. DMA 0 is not available on older 
  22                machines and will cause a crash on them.
  23
  24mpu_io          The MPU emulation base address. This sets the base of the
  25                synthesizer. It is typically 0x330 but can be altered.
  26
  27mpu_irq         The interrupt to use for the synthesizer. It must differ
  28                from the IRQ used by the Microsoft Sound System port.
  29
  30
  31The mpu_io/mpu_irq fields are optional. If they are not specified the 
  32synthesizer parts are not configured.
  33
  34When the module is loaded it looks for a file called 
  35/etc/sound/pss_synth. This is the firmware file from the DOS install disks.
  36This fil holds a general MIDI emulation. The file expected is called
  37genmidi.ld on newer DOS driver install disks and synth.ld on older ones.
  38
  39You can also load alternative DSP algorithms into the card if you wish. One
  40alternative driver can be found at http://www.mpg123.de/
  41
  42