Tandy 1000 SL Technical Reference Manual page 570

BIOS Services
Keyboard Tables
These symbols have special meanings in the following tables:
--
X
e
+
Y
Indicates that no ASCII code is generated for the key com-
bination.
Values preceded by x are extended ASCII codes. The
keyboard driver returns a NULL ASCII code and the num-
ber in the table for the scan code.
Values preceded by e are produced when you are using an
enhanced BIOS. When using the BIOS Read Key function,
these keys are either discarded or translated to a value com-
patible with older computers. When using the Enhanced
Read Key function, AH=lOH, INT l6H, these keys are
returned to your program.
A
+
in the scan code field denotes the extra key on the in-
ternational version of the enhanced keyboard. This key is
not available on the standard USA enhanced keyboard.
The
ALT
key provides a way to generate the ASCII code of
the decimal numbers in the range
1
to 255. Hold down the
ALT
key while typing a number in that range on the numeric
keypad. When you release the
ALT
key, the character of the
ASCII code you typed is generated and displayed.
BREAK Empties the keyboard queue and executes the keyboard
break interrupt (INT 1BH). Places a NULL ASCII scan
code in the keyboard queue.
PAUSE Delays system activity until you press another key.
PrtSC or Invokes the BIOS print screen function (INT 5H).
Print Scrn
49.