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Mnemonic
KLOAD-
KDBOl-
KDB02-
KDB03-
KDB04-
KDB05-
KDB07-
KDB09-
Table
3-1.
Signal
Functions
Function
Load
mode
transfers:
Initiated
by
operation
of
load switch
and
start
switch on control panel or
activation
of
load
line
and
start
line
from machine
control interface.
When
these conditions occur,
the
KLOAD-
signal becon-ie active (ground)
and
remains
active
until
the
recognition
of
a stop
command.
After recognition
of
the stop signal, the
KLOAD-
line
becomes
passive
(+6V).
This
output signal
from
the
controller
is
to
be
used by
the
interface
unit
as
a
command
to
initiate
transfers.
Least
significant input
bit of
octal
character; passive (+6V)
is
defined
as a
ZERO,
ground
as a
ONE.
This
signal
must
be
passive during
a
blank character
or leader.
Second most
significant input
bit of
octal
character; passive
{+6V)
is
defined as a
ZERO,
ground
as a
ONE,
This
signal
must
be passive during
a
blank character
or leader.
Most
significant input
bit of
octal
character; passive
is
defined
as a
ZERO,
ground
as a
ONE.
This
signal
must
be passive
during
a
blank character
or leader.
When
this
input signal
is
active (ground)
it
is
interpreted
as a
delete
character
signal,
and causes
the
data character associated
with
it
to
be treated
as a
blank character
or
leader no matter
what
the
character
content.
This
input signal
must
be passive (+6V) during blank character
or leader;
when
active (ground)
it
differentiates a
ZERO
character
from
blank
or leader.
When
this
input signal
is
made
active (ground)
it
is
interpreted
as a stop
command.
It
is
not
gated with
the
transition
of
KDB09-
as
is
a
data character.
A
pulse on
this line at
any
time
will
stop the controller.
This character
can
not
be
deleted.
Transition
from +6V
to
ground
on
this
input
line
gates data
character
into the controller.
This strobe pulse
from
the input
device also causes
shifting
and storage
of
the
accumulator and
after
every
fourth
shift,
advancing
of the
program
counter.
Pin
26
The
following
example
(Figure
3-2)
shows
a typical
load
mode
interface fronn a
paper
tape reader.
Since
more
than one device
can be operated
in
the
load
mode
and
the
controller
does
not select
which
device
is
to
be read,
each
device
must
have
a
means
by which
the
operator
can
select the
desired
device.
The
standard devices which can operate
in
the
load
mode
are
the
input/output typewriter
and
the
high-speed paper
tape reader.
3-2
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