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oldlinux-files/docs/interrupts/int-html/rb-1755.htm
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<TITLE>Int 16/AH=01h
</TITLE>
<META NAME="Description" CONTENT="
Int 16/AH=01h - KEYBOARD - CHECK FOR KEYSTROKE -
AH = 01h
Return: ZF set if no keystroke available
ZF clear if keystroke available
AH = BIOS scan code
AL = ASCII character
Note: if a keystroke is present, it is not removed from the keyboard buffer;
however, any extended keystrokes which are not compatible with 83/84-
key keyboards are removed by IBM and most fully-compatible BIOSes in
the process of checking whether a non-extended keystroke is available
some (older) clone BIOSes do not discard extended keystrokes and manage
">
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<h2>Int 16/AH=01h
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<h3><font color=#C00040>KEYBOARD - CHECK FOR KEYSTROKE</font></h3>
<PRE>
AH = 01h<br>
<p><b>Return:</b><br>ZF set if no keystroke available
ZF clear if keystroke available
AH = BIOS scan code
AL = ASCII character
</PRE>
<p><b>Note:</b>
If a keystroke is present, it is not removed from the keyboard buffer;
however, any extended keystrokes which are not compatible with 83/84-
key keyboards are removed by IBM and most fully-compatible BIOSes in
the process of checking whether a non-extended keystroke is available.
Some (older) clone BIOSes do not discard extended keystrokes and manage
function AH=00h and AH=10h the same.
The K3PLUS v6.00+ INT 16 BIOS replacement doesn't discard extended
keystrokes (same as with functions 10h and 20h), but will always
translate prefix E0h to 00h. This allows old programs to use extended
keystrokes and should not cause compatibility problems
<p><b>See Also:</b>
<a href="rb-1754.htm" tppabs="http://www.ctyme.com/intr/rb-1754.htm">AH=00h</a> - <a href="rb-1772.htm" tppabs="http://www.ctyme.com/intr/rb-1772.htm">AH=11h</a> - <a href="rb-1779.htm" tppabs="http://www.ctyme.com/intr/rb-1779.htm">AH=21h</a> - <a href="rb-2243.htm" tppabs="http://www.ctyme.com/intr/rb-2243.htm">INT 18/AH=01h</a> -
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<b>Category: <a href="cat-003.htm" tppabs="http://www.ctyme.com/intr/cat-003.htm">
Bios</a>
- <a href="int-16.htm" tppabs="http://www.ctyme.com/intr/int-16.htm">
Int 16h</a>
- <a href="alpha-k.htm" tppabs="http://www.ctyme.com/intr/alpha-k.htm">
K</a>
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