VIAUDD.SYS

VIA audio sound system driver for the VIA Southbridge with built in AC97 Controller.

DEVICE=VIAUDD.SYS

NOTE: There are different drivers with the same name available. Please consult the readme delivered with the driver.

Parameter:

/N:

Symbolic device name for binding with MMPM/2. This is automatically selected by MINSTALL.EXE. Defaults to VIAUD1$".

/NO_IRQ_SHARING

Disable the IRQ sharing mode. Normally, VIAUDD.SYS automatically detects whether IRQ sharing is needed and performs the necessary setup.

/!OEM

Prevent any special setup for AC'97 codec ICs. This parameter disables any vendor-specific setup done by the driver.

/ALC|/!ALC

Override ALC-201A detection. Normally the driver detects the presence of ALC-201A automatically and performs the necessary setup; however, the presence of codec may be forced using /ALC or disabled with /!ALC (/!ALC is a synonym for /!OEM).

/LFREQ|/AFREQ /LFREQ,

which is the default for chip revisions >=0x30, uses a modified frequency algorithm known from VIA drivers for Linux. /AFREQ, default for the older revisions, uses the officially documented algorithm known from ALSA driver. Use /LFREQ if the sound plays too slowly; use /AFREQ if the sound plays too fast or with interruptions.

/VERBOSE

Verbose output, useful for troubleshooting or finding out the capabilities of a specific AC'97 solution. Shows if any step during initialization fails and makes a pause to let the user examine the results.

/QUIET

Quiet initialization - display no messages at all.

/R:

Configure Audio Codec '97 registers manually. This is intended for advanced users, as the IOCTL90 mixer interface should be usually enough for customization. The format of is:

=,,...

or

..=value,...

Refer to AC'97 specification for a list of register values and their meanings.

Practical examples:

Enable the +20 dB microphone gain: /R:0E=40
Enable simulated stereo (if supported): /R:20=4000
Enable bass boost (if supported): /R:20=1000

Platform Support:
OS/2 2.x	OS/2 3.0	OS/2 4.0	OS/2 4.5x
Yes	Yes	Yes	Yes