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Section 4: Programming 1 57
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Editing Operations
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You edit with the mode switch set to W/PRGM. The edit operations make it easier to key in programs
because, in case of mistakes, you can correct a wrong step by (1) stepping through your program
using SST until the wrong step is in the display, (2) pressing gDEL (delete program step) and
by reentering the step correctly.
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To insert an operation following the one on display, just key it in. Now you will be able to step
through your program and insert a step between any two steps.
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Revising a Program
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Sample Case. To demonstrate the editing process, let us revise the default A function
to calculate the factorial function instead of the reciprocal function. The desired function
will be LBL A gn! RTN, which is identical to what is already in memory except for the
fourth key. We need only delete the 1/x and insert n!.
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Editing Procedure: Before we can delete 1/x, we must move the pointer to 1/x
(code 04). Conceivably we could repeatedly press SST in W/PRGM mode. This would advance
the pointer to the bottom of memory, through the top, and to the first location,
etc. in circular fashion.
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