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Y28-6604-1
Program Logic
IBM System/360 Operating System
Sequential Access Methods
Program Number 3S0S-DM-50B
This publication describes the internal
logic of the routines of the queued sequen-
tial access method, the basic sequential
access method, and the basic partitioned
access method of IBM System/360 Operating
System. Program Logic Manuals are intended
for use by IBM customer engineers involved
in program maintenance, and by system pro-
grammers involved in altering the program
design. Program logic information is not
necessary for program operation and use;
therefore, distribution of this manual is
limited to persons with program maintenance
or modification responsibilities.
Restricted Distribution
PREFACE
This publication describes the sequen-