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1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
41 lines
1.7 KiB
Text
41 lines
1.7 KiB
Text
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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