Keyboard Scan-Code Outputs - IBM AT 5170 Technical Reference

Keyboard Scan-Code Outputs
Each key is assigned a unique 8-bit, make scan code, which is sent
when the key is pressed. Each key also sends a break code when
~
the key is released. The break code consists of two bytes, the
first of which is the break code prefix, hex FO; the second byte is
the same as the make scan code for that key.
The typematic scan code for a key is the same as the key's make
code. Refer to "Keyboard Layouts" beginning on page 4-15 to
determine the character associated with each key number.
The following figure lists the positions of the keys and their make
scan codes.
Key
Make Code Key Make Code Key Make Code
Number Number Number
1 OE
31
1 C
67
OB
2 16
32
lB
68 OA
3
1 E
33
23 69 09
4 26
34
2B
70 05
5
25
35
34
71
04
6 2E
36
33
72
03
7 36
37
3B
73
83
8
30
38
42
74
01
9
3E
39
4B
90
76
10 46
40 4c
91
6C
11 45 41
52
92
6B
12
4E
43 5A
93
69
13
55
44 12
95 77
14
50 46 lA
96 75
15 66
47
22
97 73
16 OD
48 21
98
72
17
15 49
2A
99
70
18 1 D
50 32
100 7E
19 24
51 31
101 7D
20
2D
52
3A
102 74
21 2C
53
3C
103 7A
22
35 54 49
104 71
23 3C
55
4A 105 84
24
43
57 59
106
7C
25
44
58
11 107 7B
26 40
61
29
108
79
27 54 64
58
28
5B
65
06
30
14
66 OC
Note: Break codes consists of two bytes; the first is hex FO,
the second is the make scan code for that key.
Keyboard 4-11