IBM System/360 System Programmer's Guide

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

IBM System/360 Specifications

General

Brand	IBM
Model	System/360
Category	Desktop
Language	English