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     This function is supported by the PC/XT and PCjr ROM BIOS, but is
     not present in the ROM BIOS for the original PC.
 
     The returned value is the cumulative number of clock ticks since
     midnight. There are 18.2 clock ticks per second. When the counter
     reaches 1,573,040, it is cleared to zero, and the rolled-over flag
     is set.
 
     The rolled-over flag is cleared by this function call, so the flag
     will only be returned nonzero once per day.
 
     Int 1Ah Function 01h can be used to set the clock tick counter to
     an arbitrary 32-bit value.
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