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Appendix E
Keyboard Structures
This appendix gives character code and keyboard information for the APC. The
characters that can be generated and their associated codes are shown in Table E-l.
The meanings of the ASCII special characters are given in Table E-2. Table E-3lists
the APC special characters that differ in representation from the ASCII standard,
but the generated code is the same. A quick reference quide for easy association of
the ASCII special characters and the APC special characters is provided in Table
E-4. The APC keyboard layout is given in Figure E-l. The APC GRPHI characters
are shown in Figure E-2, the GRPH2 characters in Figure E-3.
KEY INPUT STATUS
The status of the keyboard signal is returned in register AH in response to a CONIN
BIOS call (function 3) through a Direct BIOS call (BDOS function 50). Each bit
refers to one keyboard mode, as follows.
M
S
B
7
CAPS
LOCK
6
5
4
SHIFT ALT
3
2
IG~PH
GRPH
1
1
CTRL
L
S
B
Obit
FNC
E-l
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