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Getting Started
Power On and Off
The HP-27S
is powered by three mercury batteries. The calculator
is
shipped
with
batteries
installed.
To
turn
on the
calculator,
press
fTLRl.
To
turn
the
calculator
off,
press
the
I
(shift) key, then
IELR
l.
Since
the
calculator has
Continulus
Memary,
turning
it
off
does
not affect the information you've
stored.
To
conserve
energy,
the
calculator
turns itself
off
10
minutes after
you
stop using it.
If
you
see
the low-battery annunciator
({=)
at the top
of
the dis-
Play,
you should
replace
the batteries
as
soon
as possible,
using
the
instructions
on
page
L92.
The Display
The Display Contrast
To adjust
the display contrast, hold down
I-CLR
I
while you
press
[T]
or
E.
l:
Getting Started
t5
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