HP HP-11C - Lastx

32 Section 2: Memory Stack, LAST X, and Data Storage
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As you can see, we worked through the problem one operation at a
time. The stack automatically dropped after each two-number
calculation. And, after each calculation, the stack automatically
lifted when a new number was keyed in. Even more complicated
problems are solved in the same simple manner.
Example: Instead of the arrow diagrams we’ve used earlier in this
section, we’ll use a table to follow stack operation as we solve the
expression
(3+4)X(6—4)
2
T
2
Y =
X=
Keys
3
6
T
Z
Y >
X=»
Keys
LASTX
The HP-11C’s LAST X register, a separate data storage register,
preserves the value that was last in the display before execution of