INT 60 u - HP 95LX System Manager - "M_TELLTIME" - DISPLAY TIMESTAMP
        DI = 0B08h
        STACK:  2 WORDs unused dummies (for calls from high level languages)
                WORD    timestamp format
                        bits 1-0:
                                00 date only
                                01 time only
                                10 date and time
                                11 day and date
                        bit 4: supply am/pm
                        bit 5: supply seconds
                        bit 6: show year
                        bit 7: four-digit year
                WORD    row (-3 is topmost, 0 is first non-reserved line)
                WORD    column
Return: ???
        STACK unchanged