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Introduction
The HP-65 can save a number in each of the four registers.
Most problems can be solved by keying in the numbers in the
same orderas they appearin 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 (+,—,X,—, etc.). If there is no
operation you can perform, [ENTER®] this number and repeat the
procedure, keying in the next number. The following examples
illustrate this procedure.
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) trans-
ferred to X, and x transferred to Last X. (Last X is described in
Section 1.)
Press
Contents
[
Location
*
+
y \ Y
Last X
The same dropping action takes place with any arithmetic oper-
ator (+,—, X, or=); the result is placed in X.
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