Mitsubishi Electric Apricot LS340 Owner's Handbook Manual page 62

A d d i n g E x p a n s i o n C a r d s
devices in the computer. In other words, the settings must not
conflict.
The documentation accompanying the card should tell you whether
the card supports Plug and Play, or if not, how to configure it.
Remember to check any diskettes supplied with the card for
README or other help files.
Some cards require you to move jumpers or set switches on the card
to configure them. This is best done before installing the card in the
computer. Other cards can be configured by running a
configuration program after installing the card. Some cards use a
mixture of both methods.
Cards often come with pre-configured or default settings. It is best
to rely on these settings as much as possible, and change them only
if they conflict with other devices.
Interrupt request level (IRQ)
The interrupt request level or IRQ (the two terms are used
interchangeably) is the line over which the expansion card sends a
signal to get the attention of, or interrupt, the processor.
Your computer has interrupt levels numbered IRQ0 to IRQ15.
Most of these are reserved for components on the computer's
motherboard. Some of these interrupts are fixed; others can be re-
assigned, or freed by disabling the component with BIOS Setup.
The following table lists the interrupts used by the computer.
Interrupts that have no default assignment can be used by expansion
cards.
In addition, IRQ3 is available if you disable serial port B with the
BIOS Setup utility. Similarly, IRQ4 is available if you disable serial
port A. Obviously, you shouldn't disable either one unless you have
no intention of using the affected port.
Note that IRQ5 is not used in Apricot VS340 models that lack
on-board audio systems.
If you configure the parallel port to Standard mode, its interrupt
(IRQ7 or IRQ5) can usually be used by an expansion card without
APRICOT LS/VS340 OWNER'S HANDBOOK 6/3