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Radio Shack TRS-80 PC-3

Radio Shack TRS-80 PC-3
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shows
the
number
of
10's,
the
third
the
number
of
10's, and
the
fourth
the
number
of
1000's. These are simply increasing powers
of
10.
Scientific
notation
breaks
down
a decimal
number
into
two
parts:
one
shows what
the
numbers are;
the
second shows how far a
number
is
to
the
left
or
right
of
the
decimal
point.
For example:
1234
becomes
1.234
times 10
3
(3
places
to
the
right)
654321
becomes 6.54321 times 10
5
(5
places
to
the right)
.000125
becomes 1.25 times
10-
4
(4
places
to
the
left)
Scientific
notation
is
useful for many shortcuts. You can see
that
it would
take
a lot
of
writing
to
show 1.0 times 10
87
- a 1 and
87 zeros! But,
in
scientific
notation
this
number
looks like this:
or
1.0
IE
87
The PC-3 uses scientific
notation
whenever numbers become
too
large
to
display using decimal
notation.
This
computer
uses a
special
exponentiation
symbol,
the
IE,
to
mean
"times
ten
to
the":
1234567890000
is
displayed
as
1.23456789
IE
12
.000000000001
is
displayed as
1.
IE
-12
Those
of
you
who are unfamiliar with this
type
of
notation
should take some time
to
put
in
a few very large and very small
numbers
to
note
how
they
are displayed.
42

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