HP-15c Overflow question

[C.Ret]

Bob Prosperi indicate the two main way to get ride off the erroneous screen blinking conditions by pressing the [← ] key to clear the display or the [ ON ] key to turn off the calculator.

A third way to stop the "blinking" display after overflow is to clear the error flag indicator by typing [CF][ 9 ].

In program, you can also test this specific flag to detect a "crash" and branch to an alternate code.
Oppositely, you can turn on the "blinking screen" by setting flag 9 on to warn the user of a specific situation or suspicious result.