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IBM System/360 20 User Manual

IBM System/360 20
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If
the
correct
standard
assignments
for
a
particular
Model
20
system
were
made
by
means
of
ASSGN
statements
at
the
time
the
system
tape
was
built,
and
the
unit
numbers
are
different
frOM
those
contained
in
the
IBM-supplied
REP
cards,
these
REP
cards
must
be
removed
from
the
IPL
deck,
so
that
the
end-of-file
card
directly
follows
the
ASSGN
card
for
SYSRES
(or
that
for
SYSRDR,
if
present)
•
Through
the
use
of
REP
cards
in
an
IPL
procedure,
a
systE~m
tape
that
has
been
created
for
a
particular
Model
20
system
can
be
used
on
other
systems
with
different
tape-drive
unit
numbers.
The
system
tape
is
not
modified,
since
only
the
Basic
Mon-
itor
program
in
main
storage
is
affected.
THE
TAPE BASIC
MONITOR
PROGRAM
The
tape
Basic
Monitor
program
is
the
main
control
program
of
the
tape-resident
sys-
tem.
It
contains
the
logical
unit
table,
which
consists
of
22
logical
unit
blocks.
Each
logical
unit
block
is
used
to
associ-
ate
a
symbolic
device
address
with
a
phys-
ical
device
address.
The
tape
Basic
Mon-
itor
program
supplied
by
IBM
contains
stan-
dard
assignments
for
a
number
of
symbolic
device
addresses.
The
remaining
symbolic
device
addresses
are
not
assigned.
The
standard
assignments
in
the
tape
Basic
Mon-
itor
are
shown
in
Figure
4.
r--
I
----,
ISymbolic
AddresslPhysical
Device
Address
1
j-
+
------1
ISYSRES*
Inot
assigned
1
ISYSRDR
12501
Card
Reader
1
ISYSIPT
)2501
Card
Reader
1
ISYSOPT
12560
secondary
Feed
1
ISYSLST
11403
Printer
1
ISYSLOG
11403
Printer
1
ISYSOOO -
SYS015*lnot
assigned
1
L---
---l
J
*
Only
tape
drives
can
be
assigned
to
these
symbolic
device
addresses.
Figure
4.
Symbolic
Device
Addresses
and
Standard
Assignments
in
the
Tape
Basic
Monitor
Program
When
the
Basic
Monitor
program
has
been
read
into
main
storage,
and
insertions
or
changes
(if
any)
of
standard
assignments
have
been
made
by
means
of
the
IPL
program,
control
is
transferred
to
the
loading
rou-
tine
of
the
Basic
Monitor
program.
This
routine
loads
the
Job
Control
program
and
other
programs
from
the
program
library
into
main
storage.
It
is
called
initially
by
the
IPL
program
and
then
either
by
the
Job
Control
program
or
by a
System
Service
or
problem
program
that
has
just
been
executed.
The
tape
Basic
Monitor
program
also
con-
tains
physical
tape
I/O
and
error
routines.
This
group
of
routines
is
entered
whenever
an
I/O
operation
in
the
program
that
is
being
executed
refers
to
a
tape
drive.
The
routines
provide
for
a
number
of
programmed
halts.
The
code
displays
associated
with
these
halts
are
identified
by
a 7
in
the
S-field
of
the
E-S-T-R
register
panel
on
the
CPU
console.
When a
halt
has
been
caused
in
the
tape
I/O
and
error
routines,
the
operator
can
in
most
cases
display
additional
data
(such
as
the
CSW,
the
CCW,
sense
data,
or
register
contents)
to
diag-
nose
the
error
and
determine
the
procedure
to
be
followed.
The
halt
code
displays
and
the
appropri-
ate
restart
procedures
for
all
programmed
halts
that
the
tape
Basic
~onitor
program
provides
for
are
described
in
the
section
g!~g~gIDmgg=n~1!_]i§£1gY§_ang~~~tart
R£Q~gg!!£g§·
THE
TAPE
JOE
CONTRCL
PROGRA~
The
Basic
Monitor
loads
the
Jot
Control
program
into
storage
both
at
system
initia-
tion
time
and
before
each
program
is
loaded.
The
Job
Control
program
processes
the
job
control
statements,
which
are
read
an
the
device
assigned
to
SYSRDR.
Job
Con-
trol
statements
may
be
issued
to
the
tape
Job
Control
program
for
the
following
purposes:
•
Indicating
the
beginning
of
a
set
of
job
control
statements
and
specifying
the
name
of
the
program
to
be
executed
next
(JOB) •
•
Inserting
the
date
into
the
communica-
tion
region
of
the
Basic
Monitor
program
in
main
stor
age·
(DA
TE) •
•
Altering
the
storage-capacity
specifica-
tion
contained
in
the
communication
region
of
the
Basic
~onitor
in
main
storage
(CONFG).
•
Updating
an
I/O
device
assignment
in
the
Basic
Monitor
in
main
storage
(ASSGN).
•
Positioning
a
reel
of
tape
by
skipping
a
specified
number
of
tape
marks,
starting
from
the
present
position,
or
by
rewind-
ing
to
the
load
point
~ILES).
•
Specifying
the
name
of
a
tape
file
to
be
processed
and
the
symbolic
address
of
the
drive
on
which
this
file
is
mounted
(VOL) •
•
Supplying
tape
label
information
(for
later
use)
for
the
tape
file
to
be
pro-
cessed
(TPLAE).
14
System/360
Model
20
TPS
Operating
Procedure£

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IBM System/360 20 Specifications

General IconGeneral
BrandIBM
ModelSystem/360 20
CategoryStorage
LanguageEnglish

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