The 82182A Time Module
The time module added a real-time clock. The clock allowed you to use the actual time in your programs.
You could also define alarms that triggered calls to user programs. The alarms were able to switch the calculator on, so it was possible to create programs that executed at some point during the day, then switched the calculator off until the next alarm. As the HP-41 was often used as data-gathering device in labs, this allowed the calculator to read data from monitored devices at specific times every day, without having to run in between the readings (thus saving battery capacity).
The HP-41CX had the time module built-in.
Read more about this topic: HP-41 Extension Module
Famous quotes containing the word time:
“Dear, why should you command me to my rest,
When now the night doth summon all to sleep?
Methinks this time becometh lovers best;
Night was ordained together friends to keep.
How happy are all other living things,
Which though the day disjoin by several flight,
The quiet evening yet together brings,
And each returns unto his love at night.”
—Michael Drayton (1563–1631)