Last X Ittt; Recovering From Mistakes - HP -67 Owner's Handbook Manual

The Automatic Memory Stack 67
3 (38
213
Intermediate answer for
(3 X .213).
&
5 E Thefirst numberis keyed
in.
B8 80.20 The final answer.
LAST X
In addition to the four stack registers that automatically store
intermediate results, the HP-67 also contains a separate automatic
register, the LAST X register. This register preserves the value that
was in the displayed X-register before the performance of a function.
To place the contents of the LAST X register into the display again,
press [ ([LsTx),
Recovering from Mistakes
makesit easy to recover from keystroke mistakes, such as pressing
the wrong function key or keying in the wrong number.
Example: Divide 12 by 2.157 after you have mistakenly divided by
3.157.
Press Display
12
12.00
3.1578 Oops! You made a mis-
take.
Q Retrieves that last entry
(3.157).
x| You're back at the
beginning.
21578 The correct answer.