INT 60 u - HP 95LX System Manager - DISPLAY STRING
        DI = 0300h
        STACK:  2 WORDs unused dummies (for calls from high level languages)
                WORD    starting row (-3 is topmost, 0 is first user line)
                WORD    starting column
                DWORD   pointer to string
                WORD    length of string
                WORD    display style: 0000h normal, 0001h reverse video
                WORD    "OSTYLE"
Return: ???
        STACK unchanged
SeeAlso: INT 60/DI=0F03h,INT 60/DI=1005h