Adastra Systems NPC-486E, User Manual

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Appendix B: Hardware Interrupt Assignment
The following table describes the allocation of the 16 hardware interrupt lines for the
NPC-486E. The allocations shown are typical. Many subsystems which use the hardware
interrupt lines can use alternate lines if desired. These alternate choices are selectable via
jumper or BIOS Configuration.
IRQ Interrupt Number Primary Use Alternate Use
0 08H 18.2 ms Timer NA
1 09H Keyboard NA
2 0AH Slave 8259 interrupt controller NA
3 0BH COM2 (secondary serial)
4 0CH COM1 (primary serial)
5 0DH Not used (LPT2) Ethernet controller
6 0EH Floppy disk controller NA
7 0FH LPT1
8 70H Real time clock NA
9 71H LAN
10 72H Not used Video
11 73H Not used
12 74H PS/2 Mouse
13 75H Math coprocessor NA
14 76H Fixed disk controller NA
15 77H Not used
NA: "Not Applicable", no alternate function allowed.