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3-1-3
Master interrupt mask
register failure.
3-1-4
Slave interrupt mask
register failure.
3-2-4
Keyboard controller test
failure.
3-3-4
Display memory test failure.
3-4-1
Display initialization failure.
3-4-2
Display retrace test failure.
4-2-1
No timer tick.
4-2-2
Shutdown failure.
4-2-3
Gate A20 failure.
4-2-4
Unexpected interrupt in
protected mode.
4-3-1
Memory failure above
address 0FFFFh.
4-3-3
Timer chip counter 2 failure.
4-3-4
Time-of-day clock stopped.
4-4-1
Serial port failure.
5-1-2
No usable memory.
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
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
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
Reserved/Available
Line
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
Call Dell for technical assistance. (For instructions, see
Call Dell for technical assistance. (For instructions, see
Run the Keyboard Controller Test in the Dell Diagnostics. (For instructions, see
the Dell
Diagnostics.)
Run the Video Memory Test in the Dell Diagnostics. (For instructions, see
Dell
Diagnostics.)
Run the Video test group in the Dell Diagnostics. (For instructions, see
Diagnostics.)
Run the Video test group in the Dell Diagnostics. (For instructions, see
Diagnostics.)
Call Dell for technical assistance. (For instructions, see
Call Dell for technical assistance. (For instructions, see
Call Dell for technical assistance. (For instructions, see
Call Dell for technical assistance. (For instructions, see
Run the RAM test group in the Dell Diagnostics. (For instructions, see
Diagnostics.)
Call Dell for technical assistance. (For instructions, see
Call Dell for technical assistance. (For instructions, see
Run the Serial/Infrared Ports test group in the Dell Diagnostics. (For instructions, see
Running the Dell
Diagnostics.)
Run the RAM test group in the Dell Diagnostics. (For instructions, see
Diagnostics.)
®
®
Windows
95 and Windows 98 operating systems, click the Start button,
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Help.)
Getting
Help.)
Table 3
to configure the device for one of the
Running
Running the
Running the Dell
Running the Dell
Running the Dell
Running the Dell
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