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The Automatic Memory Stack
57
When operating the HP-67 manually from the keyboard, you can slow
down or speed up the review of the stack contents by pressing
or any other key on the keyboard while the calculatoris executing
a @
stack review. As long as you hold the key depressed,
the contentsof the stack register currently being displayed will remain
"'frozen'' in the display, permitting you to write down or examine
the number. As soon as you release the key you are holding depressed,
the contents of the next stack register to be displayed are shown.
Note: If the @)
stack review is being executed as part
of a running program, depressing a key to "freeze" a stack
register display will cause the program to halt execution
after the £
has been executed.
See section 15 for a description of how this operation helps you
interface programs that you create for your HP-67 Programmable
Pocket Calculator with the Hewlett-Packard HP-97 Programmable
Printing Calculator.
Clearing the Display
When you press
(clear x), the displayed X-register is cleared to
zero. No other register is affected when you press [E£3.
Press
now, and the stack contents are changed...
...from this...
...to this.
T
4.00
T
4.00
z
3.00
Z
3.00
Y
1.00
Y
1.00
X
2.00
Display.
X
0.00
Display.
Although it may be comforting, it is never necessary to clear the
displayed X-register when starting a new calculation. This will
become obvious when you see how old results in the stack are
automatically lifted by new entries.
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