HP HP-67

56 The Automatic Memory Stack
Similiarly, pressing (3 again will restore the numbers in the X-
and Y-registers to their original places. This function can be used to
position numbers in the stack, whether operating manually or from a
program, or simply to bring the contents of the Y-register into the
X-register for display.
Notice that whenever you move numbers in the stack using one of
the data manipulation keys, the actual stack registers maintain their
positions. Only the contents of the registers are shifted. The contents
of the X-register are always displayed.
Automatic Stack Review
If you wish to quickly review the contents of the stack at any time,
use the £} operation. When you press £} (57K, the contents
of the stack are shifted, one register at a time, into the X-register
and displayed for about a half-second each. The order of display is
T, Z, Y, and finally the X-register contents again. Press {}
now and see the contents of the entire stack displayed. (If the stack
contents in your calculator remain intact from the previous example,
your displays should match the ones shown below):
Press
6 Gy 4.00
S
=l
o]
12|
B
ol
lo
S|
|
o
)
o operates exactly as four presses of [J R¥. You can see
that after displaying the contents of the entrie stack, the original
contents of the X-register are returned there and displayed.
While a [ operation is being performed, the decimal point
blinks twice during the display of the contents of each register. This
is to identify this function as a program pause during a running pro-
gram, so that you will not think the program has stopped.