M-AUDIO MM401 User Manual
Page 14
How to Change the Address and IRQ Settings
Recent updates to the MM-401 have necessitated
changes in how the I/O address and IRQ are set. The
instructions on this page supercede the instructions in
the manual.
The MM-401 supports 4 different IRQs and 4 different
port address settings. The two left jumpers on the card
control the port address setting. The MM-401 comes set
to port address 330 and IRQ 5. This should work with
most systems and is the most common setting for MPU-
401 compatible cards. However, if your system
includes a SoundBlaster or compatible soundcard, it
will generally have the same default settings for its
MIDI/Joystick port. In this case, you will have to
change the IRQ and Port Address on your MM-401
using the chart below. “In” means that both pins are
covered by the plastic jumper. “Out” means that the
pins are uncovered or that the jumper is only covering
one of the two pins. The address pins on the MM-401
are labeled 20 and 10. The IRQ pins are labeled 3, 5, 7
and 2. The factory defaults of address 330 and IRQ 5 are
shown on next page.