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r----------------------------------------------------------------------,
~.
Data
Control
Block
Data
Control
Block
Data
Control
Block
Data
Control
Block
Work
and
Control
Block
Area
Work
and
Control
Block
Area
Work
and
Control
Block
Area
Work
and
Control
Block
Area
~---------------,-------------------------------------------------------~
Register 5 contains the starting address of a list of DCB addresses.
Each DCB specified in the OPEN
or
CLOSE
macro-instruction
has
a
4-byte
entry
in the list.
The DCBs to which the entries point are
in the problem prograro.
For each DCB specified in the OPEN
or
CLOSE
macro-instruction,
a
combined
work and control block area is built.
Register 6 contains
the starting address of a table that contains an
address
for
each
work
and
control
block
area.
The
addresses
of
the areas are
contained in
t~he
low-order three bytes of 8-byte entries.
The
list
of
8-byte
entries begins 32 bytes from the starting address of the
table.
The format of the combined work and control
block
area
is
shown in Figure 2.
- -__________________________________ - _________________________________ J
Figure
1.
Status of Control Inforroation and Pointers
Label Processing Routines
47
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