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General Operating Instructions
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To multiply 12 by 3,
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To divide 12 by 3,
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In addition to the simple problems you have just performed, the HP-80 also handles combined arithmetic processes:
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Automatic Doubling
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Automatic Squaring
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Serial Calculation
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Chained Calculation
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These problems are described in Appendix B.
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Manipulating Data
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Seven keys (excluding keys used to load entries in special operations) are used to control the location of data and the movement of data between locations. Four of these
keys are related to entering and deleting numbers:  SAVE is used to load data; STO stores a constant value; CHS changes the sign of a displayed number; CLx clears data.
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The remaining three keys (R , x y, RCL) are used to control the location of data after it has been loaded (or stored,in the case of STO).
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Through the ability to manipulate the location of data, you are able to
view the contents, can see intermediate results to problems, and have
greater operating flexibility.
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Reviewing/Verifying Data Entered
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The R (roll down) key permits you to review the previous entries or results—the last three preceding numbers to be loaded and the current entry.
Each time R is pressed, one of those numbers appears on the display in last-in/first-out order. No data are lost by rotating those numbers; after a complete circuit,
they will return to the same locations they occupied before rotation. For example,
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