Specifications

6.19. My SB16 is set to IRQ 2, but configure does not allow
this value.
On '286 and later machines, the IRQ 2 interrupt is cascaded to the second interrupt controller. It is equivalent
to IRQ 9.
6.20. If I run Linux, then boot DOS, I get errors and/or
sound applications do not work properly.
This happens after a soft reboot to DOS. Sometimes the error message misleadingly refers to a bad
CONFIG.SYS file.
Most of the current sound cards have software programmable IRQ and DMA settings. If you use different
settings between Linux and MS−DOS/Windows, this may cause problems. Some sound cards don't accept
new parameters without a complete reset (i.e. cycle the power or use the hardware reset button).
The quick solution to this problem it to perform a full reboot using the reset button or power cycle rather than
a soft reboot (e.g. Ctrl−Alt−Del).
The correct solution is to ensure that you use the same IRQ and DMA settings with MS−DOS and Linux (or
not to use DOS :−).
6.21. Problems running DOOM under Linux
Users of the port of ID software's game DOOM for Linux may be interested in these notes.
For correct sound output you need version 2.90 or later of the sound driver; it has support for the real−time
DOOM mode.
The sound samples are 16−bit. If you have an 8−bit sound card you can still get sound to work using one of
several programs available in ftp://www.ibiblio.org/pub/Linux/games/doom.
If performance of DOOM is poor on your system, disabling sound (by renaming the file sndserver) may
improve it.
By default DOOM does not support music (as in the DOS version). The program musserver will add
support for music to DOOM under Linux. It can be found at
ftp://pandora.st.hmc.edu/pub/linux/musserver.tgz.
6.22. How can I reduce noise picked up by my sound card?
Using good quality shielded cables and trying the sound card in different slots may help reduce noise. If the
sound card has a volume control, you can try different settings (maximum is probably best). Using a mixer
program you can make sure that undesired inputs (e.g. microphone) are set to zero gain.
The Linux Sound HOWTO
6.19. My SB16 is set to IRQ 2, but configure does not allow this value. 23