IBM 5150 Hardware Reference Manual

Low Memory Maps (O-'0600'x)
Table 30. Interrupt Vectors (O-7F)
ADDRESS
INTERRUPT
HEX
HEX
FUNCTION
0-3
0 Divide by Zero
4-7
1
Single step
8-B
2 Non-Maskable Interrupt (NMI)
C-F
3
Break Point Instruction ('CC'x)
10-13
4 Overflow
14-17
5 Print Screen
18-1 F
6,7
Reserved
20-23
8
Timer (18.2 per second)
24-27
9
Keyboard Interrupt
28-37
A,B,C,D
Reserved
38-3B
E Diskette Interrupt
3C-3F
F
Reserved
40-43
10 Video I/O Call
44-47
11
Equipment Check Call
48-4B
12
Memory Check Call
4C-4F
13
Diskette I/O Call
50-53
14
RS232 I/O Call
54-57
15
Cassette I/O Call
58-5B
16
Keyboard I/O Call
5C-5F
17
Printer I/O Call
60-63
18
ROM Basic Entry Code
64-67
19
Boot Strap Loader
68-6B
1A
Time of Day Call
6C-6F
1B Get Control on Keyboard Break: Note 1
70-73
1C Get Control on timer interrupt: Note 1
74-77
10
Pointer to video initialization table: Note 2
78-7B
1E
Pointer to diskette parameter table: Note 2
7C-7F
1F Pointer to table (1 KB) for graphics character
Generator for ASCII 128-255. Defaults to 0:0
Notes:
(1 )
Initialized at power up to point to an I RET Instruction.
(2)
Initialized at power up to point to tables in ROM.
3-21

IBM 5150 Specifications

General

Brand	IBM
Model	5150
Category	Desktop
Language	English