4
5100
Special
Keys
The following keys have special functions relating
to
5100
operations:
•
o
(Attention') - You can press
the
ATTN key
to
stop
system operations.
While
you
are entering
data
at
the keyboard,
you
can press ATTN
to
blank everything from, and including,
the
cursor position
to
the right
on the input line
of
the display screen. You can then continue
entering information.
In
addition, ATTN and HOLD are
the
only
keys
that
are active when
the
display screen flashes
to
indicate detec-
tion
of
an error. After you press ATTN
to
stop
the flashing display
screen,
all
keys are active and you can proceed.
(Command) - When you hold down the
CMD
key, you activate the
top
row of alphameric keys, which cause
the
command keyword
to
be
inserted
on
the
input line when the number below
the
word
is
also
pressed. The command operation
is
executed when you press
EXECUTE. The
CMD
key
is
also used with
the
numeric keys (on the
right side
of
the
keyboard)
to
initiate keys functions.
Avoid
holding
down the
CMD
key and pressing HOLD; this activates a function
restricted
to
use
by
service personnel. Holding down the
CMD
key
and pressing a key with a BASIC statement keyword
on
the
front will
enter
the
keyword beginning
at
the
current position
of
the
cursor.
When you press EXECUTE, the system processes
the
line
of
data
that
you just entered
on
the
input
line.
In
addition, you can press
EXECUTE
to
resume interrupted processing. Pressing EXECUTE
when the input line
is
blank causes
the
same action as a GO command
(see Go
Command, Chapter 2).
When you press HOLD, all processing stops unless
the
display screen
is
blank. Processing resumes when you press HOLD a second time.
Thus,
the
HOLD key allows you
to
read displayed data during an
output
operation. While processing
is
stopped,
the
CMD
key and the
arithmetic operator keys
on
the right
of
the keyboard are restricted
to
use by service personnel.
(Shift) - While you hold down a shift key,
you
can select an upper-
case symbol for input.
(Copy Display-when
CMD
is
held down) - When
you
hold down
CMD
and press the key below Copy Display,
all
data displayed on the screen
is
printed by the attached printer. You can use
the
copy display func-
tion when
the
5100
is
in
a hold state,
or
anytime
the
5100
is
waiting
for input from
the
keyboard. On a combined BASIC/APL machine,
the
CO
key
is
used
to
activate the copy display function. The
L32
64
R32 switch has no affect
on
printed data.
/ .
000"'-.
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