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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Address
  (hex)       Size      Description
 
  0000:046C   1 dword   Timer tick counter, incremented by one at each
                        timer interrupt. Initialized at system startup to
                        number of ticks since midnight. When count reaches
                        equivalent of 24 hours (1800B0h), it is reset to 0
                        and flag at 0000:0470h is set to 1.
 
  0000:0470   1 byte    Set to 1 at midnight. Indicates whether timer tick
                        count (see above) has been reset for another day.
 
                        NOTE: This value is not cumulative and does not
                        indicate the passage of successive 24-hour
                        periods.
 
  See also: Interrupt 08h (Timer Interrupt)
                                    -♦-