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File No. 8360-30
Form Y28-6617-3
Program Logic
IBM System/360 Operating System
Basic Direct Access Method
Program Logic Manual
Program Number 360S-DM-50S
This publication describes the internal logic of the
IBM System/360 Operating System basic direct access
method (EDAM). The functions and structures of the
routines are described, as are their relationships to
other portions of the operating system.
The manual is intended for use by IBM customer
engineers involved in program maintenance, and system
programmers who are altering the program design. It
can be used to locate specific areas of the program,
and it enables the reader to relate these areas to the
corresponding program listings. Program logic informa-
tion is not necessary for the use and operation of the
program; therefore, distribution of this publication is
limited to those with the aforementioned requirements.
Restricted Distribution
Fourth Edition (July 1967)
This publication corresponds to Release 12.
This publication is a major revision of Form Y28-6617-2 and rnakes that
form and prior forms obsolete. In addition to the reorganization of
some parts of the text, new material has been added to describe the
enqueuing and dequeuing of requests that require either the read-
exclusive option or the adding of new blocks of records of variable
length or undefined length. Two figures have been added to Appendix A
to describe the read-exclusive list. Figures 7 and 16 and Chart 02 have
been modified, and Chart 05 has been deleted. Chart 04 has been
~eplaced with a new chart for exclusive control under the MVT form of
the operating system.
Changes (including deletions) in the text are indicated by a vertical
line to the left of the change. Changes in illustrations are denoted by
the symbol