+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: Articles Forum (/forum-14.html)
+--- Thread: The Earthquake Bug (clock bug in HP-75, not in HP-71B) (/thread-8083.html)
The Earthquake Bug (clock bug in HP-75, not in HP-71B) - Joe Horn - 04-01-2017 04:48 AM
Once in a while, the HP-75’s TIME and TIME$ commands return an incorrect value. For example, TIME$ might return “9:40:00” when in fact the time is 9:50:00 (off by ten minutes in this example). The error can actually be as great as one hour.
These erroneous time reads are due to a bug in the HP-75. The attached article explains the cause of this bug. It also explains how the HP-71B succeeded in avoiding this bug.
http://holyjoe.net/hp/The_Earthquake_Bug.pdf