index
are
entered
into
the
volume
index
of
the
volume
to
which
it
was
connected.
This
entry
is
called
a
control
volume
pointer.
A
control
volume
pointed
to
by
a
control
volun;e
cannot,
in
turn,
point
to
another
control
volume.
Example:
In
the
following
example,
the
contrel
voluroe
whose
serial
number
is
001555
is
connected
to
the
control
volume
numbered
000155.
The
name
of
the
high
level
index
is
HIGHINDX.
r---------T----------T-------------------------------------------------,
I Name I
Operation
I
Operand
I
~---------+----------+-------------------------------------------------~
I I
INDEX
I
CONNECT
CONNECT
TWO
CON-
I
I I
Check
Exceptional
Returns
TROL
VOLUMES
WHOSE
I
I
CONNECT
I
CAMLST
I
LNKX,INDXNAME,OLDCVCL,NEWCVOL
SERIAL
NUMBERS
AREI
I
INDXNAMEI
DC
I CL8'HIGHINDX'
000155
AND
001555.
I
I
OLDCVOL
I
DC
I
CL6'000155'
I
I
NEWCVOL
I
DC
I
CL6'001555'
I
L
_________
~
__________
~
_________________________________________________
J
The
INDEX
rracro-instruction
points
to
the
CAMLST
macro-instruction.
LNKX,
the
first
operand
of
CAMLST,
specifies
that
control
volumES
be
connected.
INDXNAME,
the
second
operand,
specifies
the
main
storage
location
of
an
8-byte
area
into
which
you
have
placed
the
name
of
the
high
level
index
of
the
volume
to
be
connected.
OLDCVOL,
the
third
operand,
specifies
the
main
storage
location
of
a
6-byte
area
into
which
you
have
placed
the
serial
number
of
the
volume
to
which
you
are
connecting.
NEWCVOL,
the
fcurth
operand,
specifies
the
main
storage
location
of
a
6-byte
area
into
which
you
have
placed
the
serial
number
of
the
volume
to
be
connected.
HOW
TO
DISCONNECT
CONTROL
VOLUMES
You
disconnect
two
control
volumes
by
using
the
INDEX
and
CAMLST
macro-instructions.
If
a
control
vclume
is
to
be
disconnected
from
the
system
residence
volume,
you
need
supply
only
the
name
of
the
high
level
index
associated
with
the
volurre
to
be
disconnected.
If
a
control
volume
is
to
be
disconnected
from
a
control
volume
other
than
the
system
residence
volume,
you
must
supply,
in
addition
to
the
name
of
the
high
level
index,
the
serial
nurr-ber
of
the
control
volume
from
which
you
want
to
disconnect.
The
result
of
disconnEcting
control
volumes
is
that
the
control
volume
pointer
is
removed
from
the
volume
index
of
the
volume
from
which
you
are
disconnecting.
Example:
In
the
following
example,
the
control
volume
that
contains
the
high
level
index
HIGHINDX
is
disconnected
from
the
system
residence
volume.
r---------T----------T---------------------'----------------------------,
I
Name
I
Operationl
Operand
I
~---------+----------+------------------,-------------------------------~
I I
INDEX
I DISCNECT
DISCONNECT
TWO
CONTROL
I
I I
Check
Exceptional
Returns
VOLUMES
I
I
DISCNECTI
CAMLST
I
DRPX,INDXNAME
I
I
INDXNru~EI
DC
I CL8'HIGHINDX'
MUST
BE
8-BYTE FIELD I
L
_________
L
__________
L
_________________________________________________
J
The
INDEX
macro-instruction
points
to
the
CAMLST
macro-instruction.
DRPX,
the
first
operand
of
CAMLST,
specifies
that
control
volumes
be
disconnected.
INDEXNAME,
the
second
operand,
specifies
the
main
storage
16
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