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EXECUTE DIRECT ACCESS
PROGRA~
(XDAP) MACRO-INSTRUCTION
This
chapter
explains what the Execute
Direct-Access
Program
(XDAP)
macro-
instruction
does
and
how yeu can use it.
The control block generated
when
XDAP
is
issued and the rracro-instructions uSEd with
XDAP are also discussed.
The
XDAP macro-instruction provides you
with a
roeans
of
reading,
verifying,
or
updating
blocks
on
direct-access volumes
without using an access method and
without
writing
your
own
channel frogram.
SincE
most of the
specifications
for
XDAP
are
similar
to
those
for the Execute Channel
program
(EXCP)
macro-instructicn,
it
is
recommended
that
you be falliiliar with the
"EXCP Macro-Instruction"
chapter
of
this
putlication,
as
well
as
with
the
information contained in the required
fut-
lication.
PREREQUISITE PUBLICATION
The
IBM
Systero/360
Operating
System:
Data Managewent putlication (Form C28-6537)
explains the standard
procedures
fer
I/O
processing under the operating system.
98
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