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9
10
RIGHT and LEFT Keys
____
..._
..... ...
-
·-
.
. . .
__
.,
..
_
....
_
... .
----·-
...
·~---
......
-
--·--·-·-·
..
"'----
-
........
-
----
-
··
~
-
-
...
.
------·
. .
-
---
____
_
..
____
~-·----
..
-------- ----
·---
......
_
----·
--------.-
-
..
---·---------
..
--·-
..
-
-
.......
___
...
_
-
--
Also listed
are the locations
of
attached
Programmable Memory peripherals
with
the
number of
free characters
in
each,
plus
a
notation
of
the free
characters
in the
Internal Memory of the Primary
Unit. The
memory
area
which
is
currently selected
will
be signified
by appearing in
negative type
(white on
black).
We 'lllearn more
about
the
linkages
that
can be made with
•
1n
the
section on
peripherals (page
48).
Below
the
•
key Is
the
RIGHT
key•
.
and nearby
is its
mirror-image,
the LEFT
key
•
.
These are general purpose direction keys and perform
in
di fferen
t
ways
in
different
programs.
For
example,
when writing or editing
material
in
the File
System, these keys move
the
flashing
indica tor
(called the
CURSOR)
right
or left
without changing the
characters
across
which it
passes.
The-
and
-
keys
along
with the
•
and
•
keys
are called
ARROW
keys;
their
specific functions woll
be described
in
various
sections throughout this manual.
UP and
DOWN Keys
Locate
•
and
•
.
Like the
•
and
•
,
these are general
direction keys and
perform
in various ways.
The ROTATE Key
The
LOCK Key
The SHIFT Key
For
example,
the
Display is like a
"
window"
on
a file or list: pressing
•
causes the
line
immediately
above
the current line
to
appear-moving
the
" window"
upward,
so to
speak.
Pressing
•
reveals the line
below
the current
line.
Usually,
when
you are
typing a
line of
characters,
pressing
causes
the
line
in
the Display to
rotate
continuously
from right to left
(like
the
news
bulletins at
Times Square) until you press any key
except
•
,
,
,
,
•
,
•
or
•
.
key
is
which,
when pressed
before certain
keys
(
• • •
,
,
-
,
and all the
ARROW
keys), will put
those
keys
in
a Lock
Mode that
affects the keys as
though they were held down
continuously.
When
you press
followed by
•
·
o
r
• • •
,
the Blip appears in
the Display
above the Attention
Indicator,
LOCK.
The
Lock
Mode continues until
the
locked key
is
pressed a second
time.
Moving
down,
you encounter
which has the same purpose as a
shift
key on a
typewriter.
Pressing
it
produces an upper-case letter when followed by any
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