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INT 2F - Multiplex - DOS 3.3+ internal - READ FROM FILE
        AX = 1229h
        BX = file handle
        CX = number of bytes to read
        DS:DX -> buffer
        SS = DOS CS
Return: as for INT 21/AH=3Fh
Note:   equivalent to INT 21/AH=3Fh, but may only be called when already inside
          a DOS function call
SeeAlso: AX=1226h,INT 21/AH=3Fh