Would your rule be covered if you had to hold in another button at the same
time as hitting the memory button? Or, say, turn the power to zero before
making memory additions...
David
G3UNA
In the world of ergonomics and man-machine interface design, there is a
rule: If an action will destroy information or a state than cannot be
restored with the same effort that it took to destroy, then the system
requires either (a) a "Un-Do" function of equal simplicity, or (b) a
confirmation step.
The choice between (a) or (b) depends on the consequences of the
unintended action during the time it takes to recover. For example, a
(hypothetical!) button that shuts down the jet engines on an aircraft
requires a confirmation step... because turning off the engines until the
pilot hits UnDo would be bad!
This rule applies to software as well as hardware.
-- Eric K3NA
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