HP HP-11C User Manual

222 Appendix B: Stack Lift and LAST X
Enabling Operations
Most of the operations on the keyboard, including one- and two-
number mathematical functions like (x*)and [x], are stack enabling
operations. These operations enable the stack lift, so that a number
keyed in after one of the enabling operations lifts the stack. Note
that switching from Program mode to Run mode and turning the
calculator off, then on, are enabling operations.
T
Z>
Y - 4.0000 4.0000 53.1301
X = 4 4.0000 3 5.0000
Keys = 4 3 (¢][=P]
Stack No stack Stack
disabled. lift. enabled.
T
Z>
Y = 53.1301 53.1301 53.1301 53.1301
X= 0.0000 7 1.0000 9
Keys = 7 9
Stack No stack Stack No stack
disabled. lift. disabled. lift.
Neutral Operations
Some operations, like and [FIX], are neutral; that is, they do
not alter the previous status of the stack lift. Thus, if you disable
the stack lift by pressing [ENTER], then press n and key in a
new number, that number will write over the number in the X-
register and the stack will not lift. Similarly, if you have previously
enabled the stack lift by executing, say [+?], then execute a
instruction followed by a digit entry sequence, the stack will lift.
The following operations are neutral on the HP-11C:
[GTO)(-Jnnn CLEAR
CLEAR

HP HP-11C Specifications

General

Brand	HP
Model	HP-11C
Category	Calculator
Language	English