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Honeywell 200 Series User Manual

Honeywell 200 Series
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SECTION
I.
INTRODUCTION
CENTRAL
PROCESSOR
The
central
processor
is
the
computing
and
control
center
of
the
Model
120;
instructions
-......;
processed
within
the
central
processor
control
the
operations
of
the
entire
system!
The
Model
120
processor
is
functionally
divided
into
three
units:
storage,
control,
and
arithmetic.
The
storage
unit
provides
magnetic
core
storage
for
both
the
program
instructions
and
the
data
to
be
processed
according
to
these
instructions;
it
is
also
used
to
contain
the
resultant
data.
The
control
unit
directs
the
operation
of
the
entire
computer
by
selecting,
interpreting,
and
con-
trolling
the
execution
of
all
program
instructions.
It
controls
not
only
the
flow
of
information
within
the
central
processor,
but
also
the
flow
of
data
between
the
central
processor
and
all
peripheral
equipment.
The
arithmetic
unit
performs
such
operations
as
addition,
subtraction,
multiplication,
division,
and
comparison,
as
directed
by
the
control
unit.
Included
as
part
of
the
central
processor
is
a
control
panel
(see
Section
II)
which
provides
for
easy
communication
between
the
operator
and
the
computer.
By
using
various
control
switches,
the
operator
can
start
and
stop
the
machine
and
can
load
and
interrogate
locations
in
memory.
The
addition
of
an
operator's
console
to
a
Model
120
makes
further
monitoring
and
control
facilities
available
to
the
operator
and
increases
the
scope
and
power
of
the
associated
central
processor.
The
Type
220-1
and
220-3
Consoles
perform
the
same
basic
functions
as
a
control
panel
and
provide
the
capability
for
some
important
auxiliary
operations
as
well
(see
Section
VIII).
PERIPHERAL
DEVICES
The
basic
Model
120
can
be
equipped
with
a
card
reader,
a
card
punch,
and
a
printer
-
connected
to
the
central
processor
by
means
of
integrated
peripheral
controls.
Information
is
transferred
between
anyone
of
these
devices
and
the
central
processor
by
means
of
Peripheral
Data
Transfer
(PDT)
instructions.
By
coding
various
control
characters
in
this
instruction,
the
programmer
specifies
the
direction
of
data
transfer
(into
or
out
of
the
processor),
the
specific
device
involved
in
the
transfer,
the
data
path
over
which
information
is
to
be
transferred,
and
any
other
information
necessary
to
define
the
input/
output
operation
(e.
g.,
the
number
of
lines
to
be
spaced
during
printer
operations).
The
actual
communication
with
the
central
pro-
cessor
is
not
made
by
the
particular
device
but
by
the
peripheral
control
associated
with
that
device.
A
peripheral
control
regulates
the
transfer
of
data
between
a
processor
and
a
peripheral
device.
The
control
compensates
for
the
difference
in
the
data
transfer
rates
of
the
processor
and
the
peripheral
device
by
temporarily
storing
each
character
of
transmitted
information
until
either
the
processor
or
the
device
is
ready
to
receive
the
character.
The
control
also
1-2

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Honeywell 200 Series Specifications

General IconGeneral
BrandHoneywell
Model200 Series
CategoryDesktop
LanguageEnglish

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