IBM 5150 Hardware Reference Manual

Keyboard Encoding and Usage
Encoding
The keyboard routine provided by IBM in ROM BIOS is
responsible for converting the keyboard scan codes into what
~ill be termed "Extended ASCII".
Extended ASCII encompasses one byte character codes with
possible values of 0-255, an extended code for certain extended
keyboard functions and functions that are handled within the
keyboard routine or through interrupts.
Character Codes
The following character codes are passed through the BIOS
keyboard routine to the system or application program. A
"-1" means the combination is suppressed in the keyboard
routine. The codes are returned in AL. See Appendix C for exact
codes. Use keyboard Scan Code diagram for reference page 2-17.
Table 25. Character Codes
KEY#
BASE CASE UPPER CASE
CTRL ALT
1
ESC ESC
ESC
-1
2 1
Y2
-1
Note 1
3 2
@
NU L (000) Note 1
Note 1
4 3
#
-1
Note 1
5 4
$
-1
Note 1
6
5
%
-1
Note 1
7
6
1\
RS (030)
Note 1
8
7
&
-1
Note 1
9
8
*
-1
Note 1
10
9
(
-1
Note 1
11
0
)
-1
Note 1
12
-
US (031)
Note 1
-
13
=
+
-1
Note 1
14
Backspace (008) Backspace (OOS)
DEL(127)
-1
15
---+t (009) I+- (Note 1)
-1
-1
16
q 0
DCl (017)
Note 1
17
w W
ETB (023)
Note 1
18
a
E
ENQ (005)
Note 1
19 r
R
DC2 (018)
Note 1
20
t T
DC4 (020)
Note 1
Y
21
Y
EM (025)
Note 1
22 u U
NAK (O21)
Note 1
23 i I
HT (O09)
Nota 1
24
0
0
SI (O15)
Note 1
25 p P
OLE (O16)
Note 1
26
[
!
ESC (O27)
-1
27
]
I
GS (029)
-1
3-11

IBM 5150 Specifications

General

Brand	IBM
Model	5150
Category	Desktop
Language	English