Honeywell 400 Series - Page 11

PHYSICAL
CHARACTERISTICS
The
punched
card
subsystems,
packaged
as
single,
freestanding
units,
are
on-line
devices,
each
consisting
of
a
card
handling
mechanism,
control
electronics,
and
a
power
supply.
Operator’s
control
panels
display
a
full
array
of
controls
and
indicators
for
observing
and
controlling
the
operation
of
the
subsystems.
The
power
supply
is
adequately
fused
against
overloads
and
provides
and
regulates
the
necessary
a.c.
and
d.c.
voltages
for
the
card
handling
mechanism
and
the
control
electronics.
The
control
electronics
interpret
and
transmit
to
and
from
the
processing
system
the
data
read
from
or
punched
into
cards
and
generate
and
transmit
timing
signals
and
information
on
the
operating
condition
of
the
subsystem.
USE WITH THE SERIES 600/6000
Whenever
the
subsystem
operates
within
a
multiprogramming
environment,
its
operation
must
be
coordinated
to
mesh
efficiently
and
simultaneously
with
that of
other
peripheral
equipment
in
the
system.
The
General
Input/
Output
Supervisor
(GIOS)
program,
avail-
able
with
the
Series
600/
6000
systems,
does
this
for
the
programmer-
It
handles
the
details
that
arise
from
supervising
the
activities
and
status
of
many
peripherals
and
makes
the
most
efficient
use
of
them
in
conjunction
with
the
valuable
time
of
the
process-
ing
unit.
Whenever
use
of
the
subsystem
is
required,
GIOS
communicates
with
the Input/
Output
Controller
(ICC)
by
means
of
a
connect
instruction.
If
the
subsystem
is
busy
when
the
'
output
request
is
made,
GEIOS
queues
the
request
until
the
subsystem
becomes
ready.
When
the
subsystem
has
accepted
the
instruction
and
received
all
the
information
necessary
to
initiate
data
acceptance
and
punching
or
reading,
the
connect
sequence
ends
and
the
IOC.
data
service
sequence
begins.
This
sequence
controls
the
transfer
of
information
to
the
subsystem.
V
When
operation
stops,
either
because
of
a
normal
termination
or
because
an
alert
condition
occurred,
the
IOC
places
the
status
and
substatus
of
the
subsystem
in
the
proper
queue
and
sends
a
program
interrupt
signal
to
the
store
controller.
6108,
in
turn,
checks
each
queue
'
entry
to
be
sure
that
the
peripheral
operation
was
completed
free
of
errors.
If
it
was
not,
the
prOper
recovery
routines
are
called
in.
6108
also
returns
status
and
substatus
information
to
the
program
whenever
it
requests
it.
With GIOS efficiently assuming the burden of responsibility for directing peripheral
operations,
the
programmer
is
relieved
of
much
detailed
programming.
Programming
information on the use of the subsystem with the Series 600/6000 is contained in Series
6000/ 600 General File and Record Control stem, BN85, and Series 60007300
Em? Macro Esemfijl firogram, ENE. . .
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