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 (see below)
                WORD    row (-3 is topmost, 0 is first non-reserved line)
                WORD    column
Return: ???
        STACK unchanged

Bitfields for timestamp format:
 bits 1-0  timestamp components
        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

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