What is the Ref function and how does it replace the Memory feature in a standard adding machine?
If you have ever used the memory feature of a standard adding machine, you will appreciate the Ref function, which allows you to include a previously entered or calculated amount elsewhere in the AddsUp tape. To Reference an existing entry in the tape, press the Ref key (or type R), scroll the tape to the desired entry, and then press the operator key you want to use (+,-,*,/, etc.). A black number will appear on the tape opposite the referenced line (indicating the source of the reference). The same number will appear in blue opposite the line you have just entered (indicating a referenced number). Anytime the source of a reference changes (either because you edit it or as the result of some calculation), all other entries that reference it will also change. Note that you can also create a reference to an existing source reference simply by pressing the Ref key and entering its number followed by the desired operator. You can also include references to your source references in other
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