CCW (channel
command
word):
A
double
word
at
the
location
in
main storage speci-
fied
by
the
CAW_
One
or
more
CCWs
make up
the
channel program
that
directs
channel operations_
CE
pack:
A disk pack used
to
test
an
IBM
2314,
or
3330_ It has an
RO
data length
of
6
at
any
location
other
than
cylinder
0,
track
0_
CE volume: If
the
device
is
a
2314
or
3330,
see CE pack_
channel: A
hardware
device
that
connects
the
CPU and main storage with
the
1/0
control
units.
channel program:
One
or
more Channel
Command
Words
(CCWs)
that
control(s) a
specific sequence
of
channel operations. Execution
of
the
specific sequence
is
initiated
by a single
start
1/0 instruction.
channel program translation:
In a channel program, replacement, by software,
of
virtual
addresses with real addresses.
ell:
Core Image Library.
command
control
block
(ceB):
Under DOS and TOS, a 16-byte field required for each
channel program
executed
by physical 10CS. This field
is
used for
communication
between
physical 10CS and
the
problem program.
connnunication
region: Under DOS and TOS, an area of
the
supervisor set aside for
interprogram and intraprogram communication.
It
contains
information useful
to
both
the
supetvisor
and
the
problem program. Abbreviated comreg.
(Not
to
be confused
with
the
COMRG macro instruction)_
communications
interval: A period
of
communication
between
the
console
operator
and
Ol
TEP.
The
operator
is
requested by
Ol
TEP
to
enter
the
test-run
definition
at
this time_
concatenated
data
set: A group
of
logically
connected
data
sets.
Configuration Data Set
(CDS): A record
of
information
about
an 1/0 device or
CPU
ilCccs::;cd
by
CL TEP
ui"id
the
CL
T.
control
blocks: A storage area used by
the
operating system
to
hold
control
in-
formation.
control
dictionary:
The
external symbol dictionary
and
relocation dictionary, collec-
tively,
of
an
object
or
load modu
Ie.
control
program:
The
routines
in
the
operating system
that
manage resources, im·
p
lement
data
organization and
communications
conventions,
or
contain privileged
operations.
control
registers: In S/370, a set
of
registers used
for
operating system control
of
relocation,
priority
interruption, program event recording, error recovery, and masking
operations.
control
section:
That
part
of a program specified by
the
programmer
to
be a re-
locatable unit, all
of
which
is
to
be
loaded
into
adjoining main storage locations.
control
volume: A volume
that
contains
one
or
more
indexes
of
the
catalog.
core-wrap
mode:
The
method
of
operation
that
records
the
events
of
a trace
ic
the
PD
area
or
an
alternate area (used by PDAIDS)' It
is
the
default process
whe~
no
output
device
for
a PDAID trace has been specified.
CPU (central processing
unit):
The
unit
of
a system
that
contains
the
circuits
that
control
and
perform
the
execution
of
instructions.
CRT
(Cathode Ray
Tube):
Visual Display Screen.
CSW
(channel
status
word):
A
word
in main storage
at
location
64
that
orovides
information
about
the
termination
of
an
input/output
ooeration.
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