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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
Note: By default, this vector points at an IRET instruction
See Also: INT 49/AH=01h"TI" - INT 50"TI Professional"
Category: Vendor-specific BIOS Extensions - Int 57h - T
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