DEC DECpc LPx - Chapter 5 Device Mapping; Memory Map (LPxLPx+)

Digital DECpc LPx/LPx+ Device Mapping
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Computer Interrupt Levels (LPx 560/566)
Interrupt Number
Interrupt Source
IRQ1
Keyboard controller
IRQ3
COM2 (if enabled)
IRQ4
COM1 (if enabled)
IRQ6
Diskette drive (if enabled)
IRQ7
LPT1, LPT2, LPT3 (if enabled)
IRQ12
Mouse interrupt
IRQ13
Math co-processor
IRQ14
Hard disk drive (if enabled)
DMA Channel Assignment (all models)
Channel
Controller
Function
0 1
Refresh
1 1
Not used
2 1
Diskette controller
3 1
Not used, (ECP, standard on LPx+)
4 2
Cascade DMA
5 2
Not used
6 2
Not used
7 2
Not used