Vectors With Special Meanings - IBM 5170 Technical Reference

The following figure shows hardware, BASIC, and DOS reserved
interrupts.
Address Interrupt
80-83 20
84-87 21
88-8B
22
8c-8F 23
90-93 24
94-97 25
98-9B 26
9C-9F 27
AO-FF 28-3F
100-17F
40-5F
180-19F
60-67
1AO-1BF 58-6F
1CO-1C3 70
1C4-1C7
71
1C8-1CB
72
1CC-1CF
73
100-103
74
104-107
75
108-1 DB
76
1 DC-1 OF 77
1EO-1 FF 78-7F
200-217 80-85
218-3C3 86-FO
3C4-3FF F1-FF
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
Reserved for user program interrupts
Not used
IRQ 8 Realtime clock INT (BIOS entry
RTC INT)
IRQ 9(BIOS 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 011)
IRQ 15 (BIOS entry 011)
Not used
Reserved by BASIC
Used by BASIC interpreter while 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
5-6 System BIOS