BEETLE systems factory settings provide to use shared IRQ10 for COM3
and COM4, but COM4 can be configured by jumpers on the motherboard to
use IRQ11 instead.
Some of the new PCs use IRQ11 for USB (Universal Serial Bus).
IRQ12, pro ba ble con flict Mou se Port or PS/2 Mou se
These types of mice are supported e.g. by Windows NT through the
I8042PRT.SYS driver. The mouse usually has a (small) cylindric 6 pin
connector. It seems that these types of mice mostly will use IRQ12. The
Siemens PCD product line e. g. is delivered with this type of mouse.
Some systems allow to disable the mouse port in the BIOS Setup, e.g.
those of the Siemens PCD product line.
IRQ15, pro ba ble con flict with con trol lers
Many motherboards of the Pentium class dispose of an IDE controller,
which uses IRQ14 for the primary IDE controller (2 channels) and IRQ15 for
the secondary IDE controller (2 channels). It may come to a conflict with the
IRQ15 if the secondary IDE is set to “enabled” in the BIOS setup, e.g.
because the BEETLE system is equipped with a CD ROM drive. Thus the
IRQ15 can not be used by other controllers or functions, e.g. by an AT COM
board.
If the secondary IDE is set to “disabled” in the BIOS setup, the IRQ15 is
available and can be used by other controllers/functions, e.g. by an
AT COM board.
Ad ding COM ports un der Wind ows NT
To add a COM port to your system configuration, press the Start button and
then run the Control Panel. Click on the Ports icon and then on the Add
button to make a new COM port known to the system. Then enter the I/O
address and IRQ according to the jumper configuration you set before.
ASSIGNMENT OF COM PORT ADDRESSES
10
