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<TITLE>Int 57
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Int 57 - TI Professional PC - CRT MAPPING HOOK -
AX/BX/CX/DX/BP/SI/DI same as on entry to CRT subroutine (e.g. INT 49)
DS = BIOS system segment
ES = DE00h
Return: DF/IF flags must be preserved
ES,DS,BP preserved
AX,BX,CX,DX,SI,DI may be changed as necessary to modify the original
call
Desc: hooking this vector permits programs to intercept or modify all
screen output, including both application calls to INT 49 and
calls generated internally by the BIOS which bypass INT 49
">
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<h2>Int 57
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<h3><font color=#C00040>TI Professional PC - CRT MAPPING HOOK</font></h3>
<PRE>
AX/BX/CX/DX/BP/SI/DI same as on entry to CRT subroutine (e.g. INT 49)
DS = BIOS system segment
ES = DE00h<br>
<p><b>Return:</b><br>DF/IF flags must be preserved
ES,DS,BP preserved
AX,BX,CX,DX,SI,DI may be changed as necessary to modify the original
call
</PRE>
<p><b>Desc:</b>
Hooking this vector permits programs to intercept or modify all
screen output, including both application calls to INT 49 and
calls generated internally by the BIOS which bypass INT 49
<p><b>Note:</b>
By default, this vector points at an IRET instruction
<p><b>See Also:</b>
<a href="rb-6226.htm" tppabs="http://www.ctyme.com/intr/rb-6226.htm">INT 49/AH=01h"TI"</a> - <a href="rb-6306.htm" tppabs="http://www.ctyme.com/intr/rb-6306.htm">INT 50"TI Professional"</a>
<p>
<b>Category: <a href="cat-044.htm" tppabs="http://www.ctyme.com/intr/cat-044.htm">
Vendor-specific BIOS Extensions</a>
- <a href="int-57.htm" tppabs="http://www.ctyme.com/intr/int-57.htm">
Int 57h</a>
- <a href="alpha-t.htm" tppabs="http://www.ctyme.com/intr/alpha-t.htm">
T</a>
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