DOS / Functions / 51

                   INT 21 - DOS Internal - GET PSP SEGMENT

Input	DOS1	N	DOS2	Y	DOS3	Y	DOS5	Y	Output
AX	51h								AX
BX					Current PSP Segment				BX
CX									CX
DX									DX
ES:DI									CF

Note:   Under DOS 2.xx, this function cannot be invoked inside an
        INT 28h handler without setting the Critical Error flag

See Also 50h 26h 55h 62h PSP