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X-C 6250 Pro (300) NT Users Manual
79-0030-001 11 January 2001
Setting the COM4 IRQs
Some modem software will not work with standard communication
(COM) port and Interrupt Request (IRQ) settings. Follow these
guidelines for the mobile computer:
COM Port IRQ Setting Change to Used for
COM4 IRQ 3 IRQ 10 GSM, Cingular,
Motient, CDPD
The IRQ must be set the same in Windows NT and in the SCU. Follow
the procedures below.
To view or change the IRQ settings in the SCU
1 From the Start Menu, select Shut Down and then choose Restart
the computer.
2 Read the text on the screen while the computer is restarting, and
press
CTRL+ALT+S as soon as the following line appears:
<CTRL+ALT+S> to enter System Configuration Utility.
3 Select Components by pressing
ALT+C.
4 Select COM Ports.
5 Press
TAB to move to COM4 settings.
6 Use the
UP and DOWN ARROW keys to switch between IRQ values,
and then press the SPACEBAR on the desired setting.
7 Choose OK to save the settings.
To view the Windows NT 4.0 IRQ settings
1 From the Start Menu, select Programs, Administrative Tools, and
then choose NT Diagnostics.
2 Choose the Resources tab, then Devices, then select Serial.
NOTE Windows NT moves COM4 to COM3 after boot-up. Therefore,
even though the SCU settings are for COM4, Windows NT sees and
uses this port as COM3.