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General Operating Instructions
Getting Started
Your HP-80 is shipped fully-assembled with battery pack in place and
is ready to operate. Slide the power switch to ON.
If
anything other
than
_
appears on the
display,
see Service, Appendix E
In the HP-80, arithmetic answers appear -on the display immediately
after pressing a
+ , - ,
X
,
or
~
key
.
In an adding machine, the
+
key adds the last entry to whatever is already in the machine, and
the -
key subtracts this last entry. The HP-80 not only adds and
subtracts the same way as the old familiar adding machine, it also
mUltiplies and divides this way too-the
X
multiplies the last entry
by whatever is already in the machine, and the
~
key divides by the
last entry.
The display blinks when logic or range errors are
made.
Whenever
this
happens,
clear the display by pressing
CLX ;
_
appears on
the display and a new problem may be entered.
Keyboard Description
Figure 1 illustrates the keyboard layout and classifies the keys ac-
cording to type and function. Although most of the keys will be familiar
to you, some require further explanation because of the unique features
of the HP-80.
Number Entry Keys
@]
through ~
EJ
Number Control Keys
Seven keys are provided for manipulating numbers:
SAVE
+
saves the number appearing on the display for arithmetic
and basic calculations; terminates a number entry. (Pages
13 and 52.)
R+
rolls down and displays (in last-in/{irst-out order) whatever
four numbers have been entered and are currently in the
machine-
one number with each press of the
R+
key.
Permits review of previous entries or results. (Pages 16 and
54.)
x:y
interchanges the last number previously saved with the
number currently displayed; the former number reappears
on the display. (Pages 17 and 54.)
10
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