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IBM System/360 System Programmer's Guide

IBM System/360
137 pages
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generated.
Its
size
ranges
from
4
to
20
bytes,
depending
on
specifications
in
the
DEVD
parameter
of
this
category.
However,
if
you
do
not
specify
the
DEVD
parameter
(and
the
foundation
extension
and
common
interface
portion
is
generated),
the
maximum 20
bytes
for
this
portion
are
generated.
Some
of
the
procedures
performed
by
the
system
when
the
data
control
block
is
opened
and
closed
(such
as
writing
file
marks
for
output
data
sets
on
direct-access
volumes)
require
information
from
optional
data
control
block
fields.
You
should
rrake
sure
that
the
data
control
block
is
large
enough
t:o
provide
all
information
necessary
for
the
procedures
you
want
the
system
to
handle.
Figure
9
shows
the
relative
position
of
each
portion
of
an
opened
data
control
block.
The
fields
corresponding
to
each
parameter
of
the
DCB
macro-instruction
are
also
designated,
with
the
exception
of
DDNAME,
which
is
not
included
in
a
data
control
block
that
has
been
opened.
The
fields
identified
in
parentheses
represent
system
inforrr.ation
that
is
not
associated
with
parameters
of
the
DCB
macro-instruction.
Sources
of
information
for
data
control
block
fields
other
than
the
DCB
macro-instruction
are
data
definition
(DD)
statements,
data
set
labels,
and
data
control
block
modification
routines.
You may
use
any
of
these
sources
to
specify
DCB
parameters.
However,
if
a
portion
of
the
data
control
block
is
not
generated
by
the
DCB
macro-instruction,
the
system
does
not
accept
information
intended
for
that
portion
from
any
alternative
source.
FOUNDATION
BLOCK
PARAMETERS:
DDNAME=symbol
specifies
the
name
of
the
data
definition
(DD)
statement
that
describes
the
data
set
to
be
processed.
MACRF=(E)
specifies
that
the
EXCP
macro-instruction
is
to
be
used
in
processing
the
data
set.
EXCP
INTERFACE
PARAMETERS:
EOEA=symbol
specifies
the
2-byte
identification
of
an
end-of-extent
appendage
that
you
have
entered
into
the
SVC
library.
PCIA=symbol
specifies
the
2-byte
identification
of
a
program
controlled
interruption
(PCI)
appendage
that
you
have
entered
into
the
SVC
library.
SIOA=symbol
specifies
the
2-byte
identification
of
a
start
I/O
(SIO)
appendage
that
you
have
entered
into
the
SVC
library.
CENDA=symbol
specifies
the
2-byte
identification
of
a
channel
end
appendage
that
you
have
entered
into
the
SVC
library.
XENDA=symbol
specifies
the
2-byte
identification
of
an
abnormal
end
appendage
that
you
have
entered
into
the
SVC
library.
Note:
The
full
name
of
an
appendage
is
eight
bytes
in
length,
but
the
first
six
bytes
are
required
by
IBM
standards
to
be
the
characters
IGG019.
You
provide
the
last
two
characters
as
the
2-byte
identifi-
cation;
they
may
range
in
collating
sequence
from
WA
to
Z9.
Execute
Channel
Program
(EXCP)
Macro-Instruction
85

Table of Contents

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IBM System/360 Specifications

General IconGeneral
BrandIBM
ModelSystem/360
CategoryDesktop
LanguageEnglish

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