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+The PSS cards and other ECHO based cards provide an onboard DSP with
+downloadable programs and also has an AD1848 "Microsoft Sound System"
+device. The PSS driver enables MSS and MPU401 modes of the card. SB
+is not enabled since it doesn't work concurrently with MSS.
+If you build this driver as a module then the driver takes the following
+pss_io. The I/O base the PSS card is configured at (normally 0x220
+ or 0x240)
+mss_io The base address of the Microsoft Sound System interface.
+ This is normally 0x530, but may be 0x604 or other addresses.
+mss_irq The interrupt assigned to the Microsoft Sound System
+ emulation. IRQ's 3,5,7,9,10,11 and 12 are available. If you
+ get IRQ errors be sure to check the interrupt is set to
+ "ISA/Legacy" in the BIOS on modern machines.
+mss_dma The DMA channel used by the Microsoft Sound System.
+ This can be 0, 1, or 3. DMA 0 is not available on older
+ machines and will cause a crash on them.
+mpu_io The MPU emulation base address. This sets the base of the
+ synthesizer. It is typically 0x330 but can be altered.
+mpu_irq The interrupt to use for the synthesizer. It must differ
+ from the IRQ used by the Microsoft Sound System port.
+The mpu_io/mpu_irq fields are optional. If they are not specified the
+synthesizer parts are not configured.
+When the module is loaded it looks for a file called
+/etc/sound/pss_synth. This is the firmware file from the DOS install disks.
+This fil holds a general MIDI emulation. The file expected is called
+genmidi.ld on newer DOS driver install disks and synth.ld on older ones.
+You can also load alternative DSP algorithms into the card if you wish. One
+alternative driver can be found at