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54
System Interrupts
Interrupt Controller 1
IRQ0-Timer Output (Out 0)
IRQ1-Keyboard (Output Buffer
Full)
IRQ2-Interrupt from INTR2
IRQ3-Serial Port 2
IRQ4-Serial Port 1
IRQ5-Parallel Port 2 or 3 *
IRQ6-Diskette Controller
IRQ7-Parallel Port 1 or 2 *
IRQ8-Realtime Clock INT
Interrupt Controller 2
IRQ9-Software Redirected
to INT 0AH (IRQ2)
IRQ10-Reserved
IRQ11-Reserved
IRQ12-PS/2 Mouse
IRQ13-Coprocessor
IRQ14-Primary Fixed Disk
Controller (1F0)
IRQ15-Secondary Fixed Disk
Controller (170)
* The one on-board parallel port can be configured to either Parallel
Port 1, 2 or 3. Parallel Port 1 uses I/O address 3BCh, Parallel Port
2 uses I/O address 378h, and Parallel Port 3 uses I/O address 278H.
Note:
The 16 levels of system interrupts have the following priority: IRQ0>
IRQ1> IRQ8> IRQ9> IRQ10> IRQ11> IRQ12> IRQ13> IRQ14> IRQ15>
IRQ3> IRQ4> IRQ5> IRQ6> IRQ7.
System Timers
Channel 0
System Timer
(IRQ0)
Channel 1
Refresh Request Generator
(15
µ
s Rate Generator Period
Signal)
Channel 2
Tone Generation for
Speaker
Real-Time Clock
Address
00
01
02
03
04
05
06
Function
Seconds
Second Alarm
Minutes
Minute Alarm
Hours
Hour Alarm
Day of Week
Address
07
08
09
0A
0B
0C
0D
Function
Date of Month
Month
Year
Register A
Register B
Register C
Register D