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NONSTANDARD
LABEL
PROCESSING
ROUTINES;
VOLUME
LABEL
AND DUAL-DENSITY TAPE DEVICE
EDITOR ROUTINES
Section 1 of this chapter
explains
how
to
write
routines
to process nonstandard
labels on magnetic tape,
and
how
to
add
them to the control program.
Section
2
of this chapter explains how
to write tape volume label and dual-density
tape device editor routines and insert them
in the control
program
in
place
ef
IBM
supplied editor routines.
Before
reading this chapter, you should
be familiar with the information
contained
in
the
prerequisite
publications
listed
below.
Documentation of the internal logic
of the standard label
processing
routines
can
be
obtained
through
your IBM Branch
Office.
Prerequisite Publications
The
IBM
System/360
Operating
System:
Assembler
Language
publication
(Forrr
C28-6514) contains the
information
neces-
sary
to
code
programs
in
the assemtler
language.
The
IBM
System/360
Operating
system:
Control
Prograrr Services publication
(For~
C28-6541) describes the
macro-instructions
that
are used to request services from the
control program.
The
IBM
System/360
Operating
System:
System
control
Block
publication
(Form
C28-6628) contains format illustraticns and
field
descriptions
of
the system control
blocks referred to in this
chapter.
This
publication
also
describes the format and
fields of standard magnetic tape latels.
The
IBM
System/360
Operating
Systen~:
Data Management publication (Ferm C28-6537)
discusses magnetic tape labeling.
Label Processing Routines
43
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