INTERUPT USAGE

00H Divide by zero

01H Single step

02H NMI (Parity Err)

03H Breakpoint

04H Overflow

05H ROM BIOS PrintScreen

06H Reserved (Invalid OPcode)

07H Reserved (NPU not pres.)

08H IRQ0 timer tick (Double exception error)

09H IRQ1 keyboard (NPU segment overrun)

0AH IRQ2 reserved cascade 2. 8259

0BH IRQ3 2nd com segment not present

0CH IRQ4 1st com stack seg overflow

0DH IRQ5 HD 2nd par. port

0EH IRQ6 FDD page fault

0FH IRQ7 1st p. port

10H ROM-BIOS video NPU fault

11H ROM-BIOS equipment check

12H ROM-BIOS conv. memory size

13H ROM-BIOS disk driver

14H ROM-BIOS comm. driver

15H ROM-BIOS IO system extension

16H ROM-BIOS keyboard driver

17H ROM-BIOS printer driver

18H ROM-BIOS ROM BASIC

19H ROM-BIOS bootstrap

1AH ROM-BIOS time of day

1BH ROM-BIOS Ctrl-break

1CH ROM-BIOS timer-tick

1DH ROM-BIOS video parameter table

1EH ROM-BIOS floppy disk parameter

1FH ROM-BIOS font (char 80-FF)

20H MS-DOS terminate process

21H MS-DOS function dispatcher

22H MS-DOS terminate address

23H MS-DOS Ctrl-C handler address

24H MS-DOS critcal error handler address

25H MS-DOS absolute disk read

26H MS-DOS absolute disk write

27H MS-DOS terminate and stay resident

28H MS-DOS idle interrupt

29H MS-DOS reserved

2AH MS-DOS network redirector

2BH-2EH MS-DOS reserved

2FH MS-DOS multiplex interrupt

30H-3FH MS-DOS reserved

40H ROM-BIOS floppy disk driver (only if HD)

41H ROM-BIOS HD parameter (drive 0)

42H ROM-BIOS video driver

43H EGA, MCGA, VGA character table

44H ROM-BIOS font PCjr

46H ROM-BIOS HD parameter (disk 1)

4AH ROM-BIOS alarm handler

5AH Cluster adapter

5BH used by cluster program

60H-66H user interrupts

67H LIM EMS driver

70H IRQ8 CMOS realtime clock

71H IRA9 software diverted to IRQ2

72H IRQ10 reserved

73H IRQ11 reserved

74H IRQ12 reserved, PS2 mouse

75H IRQ13 NCP

76H IRQ14 HD controller

77H IRQ15 reserved

80H-F0H BASIC

F1H-FFH not used