X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 3+

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INT 21 - DOS 3+ - GET PSP ADDRESS
        AH = 62h
Return: BX = current PSP segment address (see AH=26h for format)
Notes:  under DOS 3+, this function does not use any of the DOS-internal stacks
          and is thus fully reentrant
        identical to the undocumented AH=51h
SeeAlso: AH=50h, AH=51h

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