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7
8
The Keyboard
The largest
feature
of
the
HHC is the
KEYBOARD
of 65
keys,
which is your
means
for giving
instructions
to
the
computer.
The keyboard
is UNLIKE a typewriter
keyboard in that the
HHC
keys
can perform different functions
in different
programs.
The
following
descriptions are generally applicable.
but do
not
cover
every possibility.
A
computer can do
so many
tasks that
one keyboard
is not
sufficient.
Therefore,
HHC
key
definitions are changed for some programs, and entirely different
keyboards
may be substituted
(by
overlays)
for
other programs
.
Most
of
the
keys are
auto-repeat
keys;
they repeat their actions over and over if
held
down
for more than about one
second.
Most
of
the keys
are
alphanumeric
(character)
keys,
but we will
begin
with
descriptions of
the
"
function
"
keys-that
is.
keys
that perform actions
.
ON
and
OFF Keys
A
t
the upper-right
is
the
•
,
just above
the
-
.
In case you forget to
turn the HHC
off,
the unit
automatically
turns
itself
off af ter about
ten
minutes
of
inactivity,
going
into
a power-saving
mode.
that
starts
be sure
to
If
there
are peripherals connected to
the HHC,
the OFF key
turns
them
off
also,
eliminating
their
power consumption.
Nothing is lost or
forgotten
while
the HHC
is
in
the
·•off
"
(power-saving)
mode;
any
program
that
was in progress
"freezes"
and continues when
the
ON
key
is
pressed
.
The CLEAR
Key
Just
below
the
IB
and
the
key
is the
CLEAR
key.
If
you are
in
the
middle of a
program,
press
once
to
go
back
to
the
beginning
of that
program
.
If
you are
already
at the beginning of a program,
pressing
once will
return
you
to the
PRIMARY
MENU (described
on
page
18)
.
In all cases,
pressing
+
E
twice
returns
you to the
Primary
Menu.
The
110
Key
At
the
top
of
the
next
row is the Inpu t-Output key (110).
Press
•
and
any current program
will be
interrupted
to
present
a
listing of
all
presently connected
attachments
(peripherals),
the slot
numbers where the
peripherals
are attached
,
and their status (ON or
OFF).
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