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