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IBM System/360 System Programmer's Guide

IBM System/360
137 pages
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The
conversion
routine
does
all
its
work
in
general
registers.
You
must
load
registers
0,
1,
2,
14,
and
15
with
input
to
the
routine.
Register
usage
is
as
follows:
Register
o
1
2
3-8
9-13
14
15
APPENDAGES
Use
Must
be
loaded
with
a
4-byte
value
of
the
form
TTRN,
where
TT
is
the
number
of
the
track
relative
to
the
ceginning
of
the
data
set,
R
is
the
identification
of
the
block
on
that
track,
and
N
is
the
concatenation
number
of
the
data
set.
(0
indicates
the
first
or
only
data
set
in
the
concatenation,
1
indicates
the
second,
etc.
)
Must
ce
loaded
with
the
address
of
the
data
extent
block
(DEB)
of
the
data
set.
Must
be
loaded
with
the
address
of
an
8-byte
area
that
is
to
receive
the
actual
address
of
the
clock
to
De
processed.
The
converted
address
is
of
the
form
MBBCCHHR,
where
M
indicates
which
extent
entry
in
the
data
extent
block
is
associated
with
the
direct-access
program
(0
indicates
the
first
extent,
1
inal-
cates
the
second,
etc.);
BB
indicates
the
bin
nunber
of
the
direct-access
vol
un,e;
CC
indi-
cates
the
cylinder
address;
hE
indicates
the
actual
track
address;
and
R
indicates
the
block
identification.
Are
not
used
by
the
conversion
routine.
Are
used
by
the
conversion
routine
and
are
not
restored.
Must
be
loaded
with
the
contrel
is
to
te
returned
the
conversion
routine.
address
to
which
after
execution
of
Is
used
by
the
conversion
routine
as
a
base
register
and
IToust
te
loaded
with
the
address
at
which
the
conversion
routine
is
to
receive
control.
For
additional
control
over
I/O
oferations,
you
may
write
appendages,
which
must
be
entered
into
the
SVC
library.
Descriptions
of
these
routines
and
their
coding
specifications
are
contained
in
the
"EXCP
Macro-Instruction"
section
of
this
publication.
L-
AND
E-
FORMS
OF
XDAP
MACRO-INSTRUCTION
You may
use
the
L-
form
of
the
XDAP
macro-instruction
for
a
macro-expansion
consisting
of
only
a
parameter
list,
or
the
E-
form
for
a
macro-expansion
consisting
of
only
executable
instructions.
The
L-
and
E-
forms
are
described
in
Appendix
B
of
the
IBM
Systero/360
Operating
System:
Control
Program
Services,
Form
C28-6S41.
Note:
The
BLKREF
parameter
is
ignored
ty
the
"L"
macro-instruction.
The
field
may
be
supplied
macro-instruction
or
moved
into
the
lOB
by
you.
104
form
of
the
XDAP
in
the
E-form
of
the

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IBM System/360 Specifications

General IconGeneral
BrandIBM
ModelSystem/360
CategoryDesktop
LanguageEnglish

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