HP HP-18C - The History Stack; Clearing the Display; Using the Alphabetic Keys

The History Stack
Notice how lines 3, 2, and 1 show the results of the current calcula-
tion
and the two that preceded it. This record of your activities is
called
the history stack.
Figure 1-3. The History Stack
-2.67
62.86
0.00
IEIIII!lIIIi!IDIDlll1ImImmml
Line 1 }
Line 2
Line 3
History
stack
Since the HP-18C uses the display for a variety of purposes, some-
times the history stack is replaced by other information. Using the
history stack is covered on page 37.
Clearing the Display
Pressing .1 CLEAR ALL 1 clears the history stack. Sometimes,
.1 CLEAR ALL 1 has other functions. Refer to page 31 for additional in-
formation about .1 CLEAR ALL I.
Using the Alphabetic Keys
There are a number of situations where the HP-18C requires you to
type
alphabetic information into line 3. When line 3 is being used to
type in
alphabetic information, the alphabetic annunciator (U) comes
on . The editing keys described in table 1-1 are active when the alpha-
betic annunciator is on.
1: Starting to Use the HP-18C 23