HP HP-18C - Page 40

Figure 2-1. The History Stack
"Invisible" ----. 1.00
Number ~I~~:~~~~~---------------'I
. 1IEIIe.l!i!IDIlIllJ]lmIlDlIriID .
2.00
I UJe.l!i!IDIlIllJ]lmIlDlIriID I
The ITJ and ITJ keys "roll" the history stack down or up one line. You
cannot roll the history stack when there is an incomplete calculation
in
the calculator line.
The history stack can contain up to four numbers-the three visible
numbers and the last number that rolled up off the top of the display.
Pressing
ITJ brings the number back down. Also, if you hold down [!]
or ITJ, you'll see that the history stack wraps around on itself.
The top three numbers in the history stack are automatically cleared
whenever you switch menus; the number on the calculator line is re-
tained so that you can use it in other calculations.
Pressing
.1 CLEAR ALL 1 clears the history stack, and sometimes also
clears other information from calculator memory. Refer to page 31 for
additional information about .1 CLEAR ALL 1 .
Keys:
Display:
Description:
75.55 r.::::J 32.63
~ 42.92
150 [I] 7 ~
21.43
42.92 moves to line 2.
38 2: Arithmetic