Sentry Industries CA756 - Manual (Page 31)

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Replay function
This function stores the latest formula executed. After
execution is complete, pressing either the or
key will display the formula.
Pressing will display the formula from the beginning,
with the cursor located under the first character. Pressing
will display the formula from the end, with the cursor
located at the space following the last character. After this,
use and to move the cursor, to check the
formula. You can edit numeric values or commands for
subsequent execution.
* As with the number of input steps, the replay function can
accept input of up to 127 steps.