Vectors With Special Meanings - IBM AT 5170 Technical Reference

The following figure shows hardware, BASIC, and DOS reserved
interrupts.
Interrupt Address
20 80-83
21
84-87
22 88-8B
23
8c-8F
24
90-93
25 94-97
26
98-9B
27
9C-9F
28-3F AO-FF
40-5F 100-17F
60-67
180-19F
68-6F 1AO-1BF
70 1CO-1C3
71
1C4-1C7
72
1c8-1CB
73
1CC-1CF
74
100-103
75
104-107
76
108-10B
77
10C-10F
78-7F lEO-IFF
80-85 200-217
86-FO
218-3C3
F1-FF 3C4-3FF
Function
DOS program terminate
DOS function call
DOS terminate address
DOS Ctrl Break exit address
DOS fatal error vector
DOS absolute disk read
DOS absolute disk write
DOS terminate, fix in storage
Reserved for DOS
Reserved for BIOS
Reserved for user program interrupts
Not used
IRQ 8 Realtime clock INT (BIOS entry
RTC INT)
IRQ 9 TBIOS entry RE DIRECT)
IRQ 10 (BIOS entry 011)
IRQ 11 (BIOS entry 011)
IRQ 12 (BIOS entry 011)
IRQ 13 BIOS Redirect to NMI interrupt
(BIOS entry INT 287)
IRQ 14 (BIOS entry-OIl)
IRQ 15 (BIOS entry 011)
Not used
Reserved for BASIC
Used by BASIC interpreter whi Ie
BASIC is running
Not used
Hardware, Basic, and DOS Interrupts
Vectors with Special Meanings
Interrupt 15-Cassette I/O:
This vector points to the
following functions:
•
Device open
• Device closed
•
Program termination
•
Event wait
•
Joystick support
5-6 System BIOS