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Int D4 Fn 10 - PC-mos/386 V3.0+ - Enter/leave Native 386 Execution Mode [O]
AH = 10h
AL = direction (00h return to V86 mode, 01h enter native mode)
CX = length in bytes of Native Context Area ( >=1024 )
DX = segment of Native Context Area
Return: CF clear if successful
running in desired mode at instruction following INT D4 call
all segment registers converted to appropriate selectors/segments
CF set on error
AX = error code (see INT 21/AH=59h)
Note: MS-DOS calls are available in protected mode
See Also: AH=11h,AH=12h,AH=13h,INT 2F/AX=1687h,INT 67/AX=DE0Ch,INT 38
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