Hardware Interrupts
IRQ no.
Function
IRQ0
Internal timer, PIT A counter 0 output
lRQ1
I
Keyboard
IRQ2
Cascade for IRQ9
IRQ3
Serial port 2
IRQ4
Serial port 1
IRQ5
Available
IRQ6
Diskette drive controller
IRQ7
Parallel port 1
IRQ8
Real-time clock
IRQ9
Available
IRQ10
Reserved
IRQ11
Reserved
IRQ12
PS/2 mouse
IRQ13
Math coprocessor
IRQ14
Primary IDE controller
IRQ15
Secondary IDE controller
System I/O Address Map
Hex address
Assigned device
DMA controller 1, 8237
Interrupt controller 1, 8259
Reserved
Timer, 8254
Keyboard controller, 8242PE
Real-time clock NMI (non-maskable interrupt)
DMA page register, 74LS612
Interrupt controller 2, 8259
DMA controller 2, 8237
Clear math coprocessor
Reset math coprocessor
000-01F
020-03F
022-024
040-05F
060-06F
070-07F
080-09F
0A0-0BF
0C0-0DF
0F0
OF1
A-12
Specifications
Summary of Contents for ActionPC 8000
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