(
•
c
REVERSE
DISPLAY
This switch
determines
whether
the
display screen will display light characters
on
a dark background
or
dark
characters
on
a light
background.
The brightness
control
may have
to
be adjusted when
the
switch setting
is
changed.
DISPLAY
REGISTERS
This switch
is
for
the
service representative's use
when
servicing
your
5100.
Note: When
you
use
your
5100,
this switch must be in
the
NORMAL position.
KEYBOARD
The
5100
keyboard
(Figure 3) has alphameric and
numeric
keys.
The
alphameric
keys are grouped
together
and
are similar
to
those
on
a
typewriter
keyboard.
When
the
keys are pressed,
the
characters entered
appear
in
the
input
line (one
of
the
bottom
two
lines)
on
the
display screen.
If
either
shift
key
is
pressed
and
held,
the
upper
symbol
on
the
key pressed
is
entered.
The
top
row
of
alphameric
keys can be used
to
enter
numbers; however, numbers can
be
conveniently en-
tered
using
the
numeric keys
on
the
right side
of
the
keyboard.
The
arithmetic
symbols (+ -
-;-
x) located
on
the
top
row
of
the
alphameric
keyboard
can also
be entered using keys
to
the
right
of
the
numeric keys.
The
keyboard
contains
some keys
that
perform
operations
in
addition
to
those
performed
by
a
typewriter.
These keys are discussed in
the
following text. Uses
of
the
APL language
symbols
on
the
keyboard
are discussed in
the
APL language
chapter
(Chapter
4)
of
this
manual.
Attention.
Pressing ATTN
(attention)
when
entering information
from
the
keyboard
erases
everything
from
the
cursor
to
the
end
of
line o .
Pressing ATTN during
execution
of
any
expression
or
user-defined
function
stops
system
operation
at
the
end
of
the
statement
currently
being processed.
To
re-
start
the
execution
of
a user-defined
function,
enter
-+-0
LC.
Output
that
was being generated before
the
system
operation
stopped
may
not
be
displayed because
there
is
a delay
between
the
execution
of
the
statement
that
causes
the
output
and
the
actual display
of
the
output.
When ATTN
is
pressed twice during
the
execution
of
a
statement
(either inside
or
outside a user-defined
function),
the
execution
of
that
statement
stops
as
soon
as
possible. Also,
the
message INTERRUPT,
the
statement,
and
a
caret
(A)
that
indicates where
the
statement
was
interrupted
are displayed.
5
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