Services                 Interrupts             Pointers
                                                                        
10H Video services       00H Division by 0      1bH Keyboard break
11H Equipment list       01H Single-step        1cH User timer interrupt
12H Conv. memory size    02H Non-Maskable       1dH Video parms
13H Disk I/O             03H Breakpoint         1eH Diskette parms
14H Serial port I/O      04H Overflow           1fH Graphics chars
15H AT services; APM     05H Print screen
16H Keyboard I/O         06H Invalid opcode     22H Terminate addr
17H Printer I/O          07H no math chip       23H Ctrl+Break addr
18H ROM-BASIC            08H IRQ 0 Timer        24H Critical Error addr
19H Bootstrap            09H IRQ 1 Keyboard
1aH Time I/O; MRCI hook  0aH IRQ 2 cascade      40H diskette revector
0bH IRQ 3 COM 2/4      41H hard disk 0 parms
20H-2fH: DOS Interrupts  0cH IRQ 4 COM 1/3      46H hard disk 1 parms
0dH IRQ 5 LPT 2
0fH IRQ 7 LPT 1
31H DPMI services                               4aH User alarm address
33H Mouse Support        70H IRQ 8 RT Clock
67H Expanded Memory Fns  71H IRQ 9 redir IRQ 2
72H IRQ 10 (reserved)
73H IRQ 11 (reserved)
74H IRQ 12 (reserved)
75H IRQ 13 math chip
76H IRQ 14 hard disk
77H IRQ 15 (reserved)

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Interrupts and BIOS Services