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Introduction 10
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Combined Arithmetic Operation. Any time a new number is entered after an operation, the HP-65 performs an
automatic ENTER on the result of that operation. This feature allows you to work serial calculations as
well as chain and mixed chain calculations. Notice that we implicitly used this in the following:
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Sample Case:
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[(4×5) / (2+3)] – 6 = –2
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Press
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See Displayed
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4 ENTER
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5 ×
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2 ENTER
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3 +
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3 ÷
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6 –
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Notice that the numbers are entered in the same order as they appear in the problem. Now consider the stack
contents as we do the same example.
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Stack Register
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T
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Z
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20
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20
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Y
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4
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4
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20
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2
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2
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20
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4
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X
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4
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4
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5
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20
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2
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2
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3
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5
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4
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6
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–2
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Keys
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4
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5
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×
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2
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3
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+
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÷
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6
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–
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Note: ENTER is here abbreviated as .
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