15
W
W
H
H
E
E
R
R
E
E
’
’
S
S
T
T
H
H
E
E
O
O
N
N
B
B
U
U
T
T
T
T
O
O
N
N
?
?
Let’s begin by looking at the fundamentals - the layout of the keyboard and
which are the important keys that are used frequently. The sketch below
shows most of the important keys. These are the ones which control the
operation of the calculator - others are used to do calculations once the
important keys have set up the environment to do it in.
Examples of the effects of each of these keys and many more are shown on
the pages that follow.
These six screen keys change their
function in different contexts. The
bar at the bottom of the screen labels
them. Check this bar for special
functions in any given context.
The
SYMB
key nearly
always takes you to a
view in which you can
enter equations
The
PLOT
key displays the
graph view for any given
environment.
HOME
is where you will do
most of your calculations. It
is shared by all the aplets
and oversees them all.
The
NUM
key gives you a
tabular view of your
function, sequence or data.
These are the cursor (or
arrow) keys. They let you
move within a window.
The
VIEWS
key gives a
different menu in each aplet.
It can be very useful, and is
always worth checking.
The
APLET
key is central.
This key allows you to choose
which mathematical
environment you wish to
working.
So where
is
the ON button?
