Digital VENTURIS Pentium PC
Device Mapping
MCS Logistics Engineering - Nijmegen
73
Computer Interrupt Levels
Interrupt Number
Interrupt Source
IRQ0
Timer tick
IRQ1
Keyboard controller
IRQ2
Cascade interrupt
IRQ3
COM2, COM4 (if enabled)
IRQ4
COM1, COM3 (if enabled)
IRQ5
LPT2
IRQ6
Diskette drive (if enabled)
IRQ7
LPT1, LPT3 (if enabled)
IRQ8
RTC
IRQ9-IRQ11
Reserved
IRQ12
Mouse interrupt (if enabled)
IRQ13
Math co-processor
IRQ14
IDE adapter 0 (if enabled)
IRQ15
IDE adapter 1 (if enabled)
DMA Channel Assignment
Channel
Controller
Function
0
1
Refresh
1
1
Not used
2
1
Diskette (floppy disk) controller, if enabled
3
1
ECP
4
2
Cascade DMA
5
2
Not used
6
2
Not used
7
2
Not used