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r----------------------------------------------------------------------,
Work Area
(100 bytes)
Job File Control Block (JFCB)
(176 bytes)
Event Control Block (ECB) - 4 bytes
Input Output Block (lOB)
(40 bytes)
Data Extent Block (DEB)
(44 bytes)
Abbreviated DCB - (4 bytes)
Channel Command Words (CCW)
(96 bytes)
~----------------------------------------------------------------------~
I
Each
of
the
fields
within the work and control block area can be
I
I
addressed
by
your
nonstandard
label
processing
routines.
The
I
I
IECDSECT
macro-instruction
defines the symbolic names of all these
I
I
fields.
(The macro-definition and how
to
add
it
to
the
macro-
I
I
library
are
in
the
Appendix
of this chapter.)
Code this macro-
I
I
instruction (with a null operand field and immediately preceded by a
I
I
DSECT
statement)
in
the
list
of
constants
for
each
of
your
I
I
nonstandard
label
processing routines.
Using the starting address
I
I
of the work area as a base,
you
are
able
to
address
any
field
I
I
symbolically.
I
L ______________________________________________________________________ J
Figure
2.
Format of Combined Work and Control Block Area
48
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