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Introduction 9
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The HP-65 can save a number in each of the four registers.
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Most problems can be solved by keying in the numbers in the same order as they appear in the original expression,
that is, from left-to-right. To work a problem, key in the first number. If there is an operation you can perform
at this point, do it. If there is not, press ENTER . Now key in the next number. Perform any operation that
can be done (+, –, ×, ÷, etc.). If there is no operation you can perform, ENTER this number and repeat
the procedure, keying in the next number. Examples on the following two pages illustrate this procedure.
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Arithmetic and the Stack. When you press the addition key the contents of
X and Y are added together.
The stack then drops, with t reproduced in T and
Z, z transferred to
Y, (y+x)
transferred to X, and x transferred to Last X.
(Last X is described in Section 1.)
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Press
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Contents
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Location
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+
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The same dropping action takes place with any arithmetic operator (+, –, ×, or ÷); the result
is placed in X.
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