HP HP-65 - Stack Lift Enable;Disable

Stack Lift Enable/Disable
We saw, in the Introduction, that when you key in a new number
after a calculation, the calculated result is automatically lifted
in the stack, relieving you of the need to save the result (by press-
ing |[ENTER# ) before keying in the number. The same lifting ac-
tion occurs if you recall a value to X from a storage register value
the Last X register, or if you recall the permanently stored value
of ¢r. You may have observed that certain other operations also
enable the Stack Lift while €LX and ENTER# disable the lift.
You will generally be quite unaware of the lift status because the
operation is so natural for most calculations. For reference, the
keys affecting lift status are tabulated below. Notice that many
operations have no effect on the Stack Lift. Most of the opera-
tions are yet to be presented in this handbook.
Operations that disable the Stack Lift: within a
program if the program puts a number into X from pro-
gram memory just before executing the , and
CLX or ENTER4 at any time.
Operations that enable the Stack Lift: All number entry
keys:.[0] . . .[9].[]. EEX ,[T], but not CHS .
= All calculating keys: = , + , X , %+, , [Eo3,
[ows] (5wt . 0] [29) . (575 . @
[ocr] - 5m) - (]
= Stack manipulating keys: [R% ], , 7], but not
ENTER4 = Storage register keys: STO , RCL .
Operations not affecting Stack Lift status: All other keys
have no effect on the lift status. They include: all pro-
gramming keys, angular mode keys, display control keys,
clear keys (except CLX ), and CHS .