Digital Equipment CELEBRIS 5100, Service Maintenance Manual, Page: 79 / 94

Digital CELEBRIS Pentium PC Device Mapping
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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 primary (if enabled)
IRQ15 IDE secondary (if enabled)
DMA Channel Assignment
Channel Controller Function
0 1 Refresh
1 1 Not used
2 1 Diskette controller (if enabled)
3 1
Not used
4 2 Cascade DMA
5 2 Not used
6 2
Not used
7 2 Not used
PCI Configure Space Address Map
Device Number (hex) Function
00 CPU bridge
01
ISA bridge
08 Onboard PCI IDE
09 Onboard PCI VGA
0B
PCI slot 1
0C PCI slot 2