Tandy 1400LT Service Manual page 65

Extended Codes
Keyboard Extended Functions
SECOND CODE FUNCTION
(Hex)
03H
OFH
10H-19H
1EH-26H
2CH-32H
3BH-44H
47H
48H
49H
4BH
4DH
4FH
50H
5 1H
52H
53H
54H-5DH
5EH-67H
68H-71H
72H
73H
74H
75H
76H
77H
84H
78H-83H
NUL Character
Back Tab
ALT Q,W,E,R,T,Y,U,I,O,P
ALT A,S,D,F,G,H,J,K,L
ALT Z,X,C,V,B,N,M
F1-FlO Function Keys Base Case
Home
Cursor Up
Page Up & Home Cursor
Cursor Left
Cursor Right
End
Cursor Down
Page Down & Home Cursor
INS
DEL
F11-F20 (Upper Case Fl-F10)
F21-F30 (CTRL Fl-F10)
F31-F40 (ALT Fl-F10)
CTRL PRTSC (Start/Stop Echo to Printer)
CTRL Cursor Left (Reverse Word)
CTRL Cursor Right (Advance Word)
CTRL End (Erase EOL)
CTRL Page Down (Erase EOS)
CTRL Home (Clear Screen and Home)
CTRL Page Up (Top 25 Lines of Text & Home Cursor)
ALT 1,2,3,4,5,6,7,8,9,0,-,=
Table 4-6. Keyboard-3 (Extended Codes)
For certain functions that cannot be represented in the standard ASCII codes, an extended code is used. NUL code
(a character code of 00) is returned in AL. This indicates that the system or application program should examine a
second code that will indicate the actual function. Usually, but not always, this second code is the scan code of the
primary key that was pressed. This code is returned in AH.
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