Avoiding interrupt assignment conflicts – Dell Latitude CPi A User Manual
Page 148
3-1-3
Master interrupt mask
register failure.
Call Dell for technical assistance. (For instructions, see
3-1-4
Slave interrupt mask
register failure.
Call Dell for technical assistance. (For instructions, see
3-2-4
Keyboard controller test
failure.
Run the Keyboard Controller Test in the Dell Diagnostics. (For instructions, see
3-3-4
Display memory test failure.
Run the Video Memory Test in the Dell Diagnostics. (For instructions, see
.)
3-4-1
Display initialization failure.
Run the Video test group in the Dell Diagnostics. (For instructions, see
.)
3-4-2
Display retrace test failure.
Run the Video test group in the Dell Diagnostics. (For instructions, see
.)
4-2-1
No timer tick.
Call Dell for technical assistance. (For instructions, see
4-2-2
Shutdown failure.
Call Dell for technical assistance. (For instructions, see
4-2-3
Gate A20 failure.
Call Dell for technical assistance. (For instructions, see
4-2-4
Unexpected interrupt in
protected mode.
Call Dell for technical assistance. (For instructions, see
4-3-1
Memory failure above
address 0FFFFh.
Run the RAM test group in the Dell Diagnostics. (For instructions, see
.)
4-3-3
Timer chip counter 2 failure.
Call Dell for technical assistance. (For instructions, see
4-3-4
Time-of-day clock stopped.
Call Dell for technical assistance. (For instructions, see
4-4-1
Serial port failure.
Run the Serial/Infrared Ports test group in the Dell Diagnostics. (For instructions, see
.)
5-1-2
No usable memory.
Run the RAM test group in the Dell Diagnostics. (For instructions, see
.)
Avoiding Interrupt Assignment Conflicts
Problems can arise if two devices attempt to use the same interrupt request (IRQ) line. To avoid this type of conflict, check the
documentation for the default IRQ line setting for each installed device. Then consult
to configure the device for one of the
available IRQ lines.
NOTES: Installed devices cannot share the same COM port address. The default address of your computer's serial port is
COM1.
To view IRQ line assignments in the Microsoft
®
Windows
®
95 and Windows 98 operating systems, click the Start button,
point to Settings, and click Control Panel. Double-click the System icon. Select the Device Manager tab, and then double-
click Computer.
Table 3. IRQ Line Assignments
IRQ
Line
Reserved/Available
IRQ0
Reserved; generated by the system timer
IRQ1
Reserved; generated by the keyboard controller to signal that the keyboard output buffer is full
IRQ2
Reserved; generated internally by the interrupt controller to enable IRQ8 through IRQ15
IRQ3
Available for use by a PC Card unless the built-in serial port or infrared port is configured for COM2 or COM4