How was time represented in the five AP-101 general-purpose computers of the Space Shuttle?

  • How many bits?
  • Encoded as a plain binary count? Split into hours, minutes, seconds, subseconds? Binary-coded-decimal?
  • How were "T-minus" times internally represented?
  • How often did one "tick" occur?
  • Theoretically, how long until the representation would roll over?

Related: What operating system(s) were used in the space shuttle?

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    $\begingroup$ I would guess the internal time would be integer microseconds past a certain epoch, and reference times like MET (identical to the countdown) would be derived from that with accurate offsets. Parsing to a YMDHMS time would happen from that integer. $\endgroup$ – CourageousPotato May 19 at 6:10

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