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<TITLE>Int 5B
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Int 5B - TI Professional PC - KEYBOARD MAPPING HOOK -
CF set
AH = shift state (see #03247)
AL = scan code (see #03214)
Return: BX, CX, DI, ES may be destroyed
various return methods are supported:
IRET, AX unchanged: process keystroke normally
IRET, AL = FFh: discard keystroke
IRET, AX changed: process modified keystroke
chain to old INT 5B: allow other handlers to look at (possibly
modified) keystroke in AX
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<h2>Int 5B
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<h3><font color=#C00040>TI Professional PC - KEYBOARD MAPPING HOOK</font></h3>
<PRE>
CF set
AH = shift state <a href="rb-6382.htm#Table3247" tppabs="http://www.ctyme.com/intr/rb-6382.htm#Table3247">(see #03247)</a>
AL = scan code <a href="rb-6253.htm#Table3214" tppabs="http://www.ctyme.com/intr/rb-6253.htm#Table3214">(see #03214)</a><br>
<p><b>Return:</b><br>BX, CX, DI, ES may be destroyed
various return methods are supported:
<p><b>IRET, AX unchanged:</b><br>Process keystroke normally
<p><b>IRET, AL = FFh:</b><br>Discard keystroke
<p><b>IRET, AX changed:</b><br>Process modified keystroke
<p><b>chain to old INT 5B:</b><br>Allow other handlers to look at (possibly
modified) keystroke in AX
<p><b>RETF 2, CF clear:</b><br>Place returned AX into keyboard buffer without
any further processing
</PRE>
<p><b>Notes:</b>
Invoked by the keyboard ISR, and used to remap the keyboard.
If CF is clear on entry, some other handler has processed the
keystroke and the current handler should not modify it, instead
performing a RETF 2 or IRET (after clearing CF on the stack).
When requesting that a value be placed directly into the keyboard
buffer, AL and AH may not *both* be nonzero (the TI does not
return scan codes as part of the key code for non-extended keys)
<p><b>See Also:</b>
<a href="rb-1387.htm" tppabs="http://www.ctyme.com/intr/rb-1387.htm">INT 15/AH=4Fh</a> - <a href="rb-6248.htm" tppabs="http://www.ctyme.com/intr/rb-6248.htm">INT 4A/AH=00h"TI"</a> - <a href="rb-6369.htm" tppabs="http://www.ctyme.com/intr/rb-6369.htm">INT 59"TI Professional"</a>
<p><b>See Also:</b>
<a href="rb-6402.htm" tppabs="http://www.ctyme.com/intr/rb-6402.htm">INT 5C"TI Professional"</a> - <a href="rb-6406.htm" tppabs="http://www.ctyme.com/intr/rb-6406.htm">INT 5D"TI Professional"</a>
<p><b>See Also:</b>
<a href="rb-6409.htm" tppabs="http://www.ctyme.com/intr/rb-6409.htm">INT 5E"TI Professional"</a> - <a href="rb-6412.htm" tppabs="http://www.ctyme.com/intr/rb-6412.htm">INT 5F"TI Professional"</a>
<PRE>
<p>
Bitfields for TI Professional PC keyboard mapping hook shift states:
<a name=table3247></a>
Bit(s) Description (Table 03247)
7 CAPS LOCK is on
6-4 reserved (0)
3 repeated key
2 Shift is pressed
1 Alt is pressed
0 Ctrl is pressed
</PRE>
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<b>Category: <a href="cat-044.htm" tppabs="http://www.ctyme.com/intr/cat-044.htm">
Vendor-specific BIOS Extensions</a>
- <a href="int-5b-1.htm" tppabs="http://www.ctyme.com/intr/int-5B.htm">
Int 5Bh</a>
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