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INT 21 - DOS 2+ internal - CREATE PSP
        AH = 55h
        DX = segment number at which to set up PSP (see AH=26h)
        SI = (DOS 3+) value to place in memory size field at DX:[0002h]
Notes:  like AH=26h but creates "child" PSP rather than copying existing one,
          incrementing the reference count for each inherited file
        (DOS 2+) sets current PSP to DX
        (DOS 3+) marks "no inherit" file handles as closed in child PSP
SeeAlso: AH=26h,AH=50h