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Interrupt Map
NMI:
Parity check error
IRQ (H/W):
0 System TIMER interrupt from TIMER-0
1 KEYBOARD output buffer full
2 Cascade for IRQ 9-15
3 SERIAL port 2
4 SERIAL port 1
5 PARALLEL port 2 (available if not used)
6 FLOPPY DISK adapter
7 PARALLEL port 1
8 RTC clock
9 Available
10 Available
11 Available
12 PS/2 mouse (available if not used)
13 MATH co-processor
14 Primary IDE
15 Secondary IDE
POST Messages
When the BIOS detects a correctable error during POST, a beep code
sounds or an error message appears. What follows is an explanation of
these messages and the measures you can take to solve the problem
they indicate. Also included in this list are some status messages which
do not necessarily indicate an error (e.g. "CPU at nnnn," which merely
indicates the CPU speed).
Beep Codes
Only one beep code is active now, and it sounds when a video error has
occurred and the BIOS cannot initialize the video screen, and so cannot
display any information. The beep code is one long beep followed by
two short ones.
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