X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 2+ internal

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INT 21 - DOS 2+ internal - GET PSP SEGMENT
        AH = 51h
Return: BX = current PSP segment (see AH=26h for format)
Notes:  under DOS 2.x, this function cannot be invoked inside an INT 28h
          handler without setting the Critical Error flag
        under DOS 3+, this function does not use any of the DOS-internal stacks
          and is thus fully reentrant
        supported by OS/2 compability box
        identical to the documented AH=62h
SeeAlso: AH=26h,AH=50h,AH=62h

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