<s>
The	O
IBM	B-Protocol
Administrative	I-Protocol
Terminal	I-Protocol
System	I-Protocol
,	O
also	O
known	O
as	O
ATS/360	O
,	O
provided	O
text	O
-	O
and	O
data-management	O
tools	O
for	O
working	O
with	O
documents	O
to	O
users	O
of	O
IBM	B-Application
System/360	I-Application
systems	O
.	O
</s>
<s>
An	O
earlier	O
version	O
ran	O
on	O
an	O
IBM	B-Device
1440	I-Device
or	O
IBM	B-Device
1460	I-Device
Data	O
Processing	O
System	O
and	O
the	O
IBM	O
Service	O
Bureau	O
Corporation	O
offered	O
a	O
proprietary	O
version	O
,	O
Call/ATS	O
,	O
which	O
ran	O
on	O
IBM	B-Device
1440	I-Device
systems	O
or	O
on	O
IBM	B-Application
System/360	I-Application
DOS	O
systems	O
.	O
</s>
<s>
Later	O
,	O
support	O
was	O
added	O
by	O
user	O
groups	O
for	O
2741	O
terminals	O
with	O
the	O
"	O
break	O
feature	O
"	O
and	O
for	O
IBM	B-Device
1050	I-Device
terminals	O
(	O
that	O
implicitly	O
incorporated	O
the	O
"	O
break	O
feature	O
"	O
)	O
.	O
</s>
<s>
ATS/360	O
was	O
designed	O
exclusively	O
for	O
IBM	B-Device
2311	I-Device
and	O
IBM	B-Device
2314	I-Device
direct	O
access	O
storage	O
facilities	O
,	O
for	O
on-line	O
"	O
Working	O
storage	O
"	O
and	O
"	O
Permanent	O
storage	O
"	O
and	O
for	O
IBM	B-Device
2400/3400	I-Device
tape	O
drives	O
,	O
for	O
off-line	O
"	O
Rollout/Rollin	O
"	O
(	O
Permanent	O
storage	O
backup/restore	O
)	O
and	O
"	O
Format	O
and	O
print	O
"	O
tapes	O
.	O
</s>
<s>
An	O
IBM	O
hardware	O
RPQ	O
provided	O
the	O
IBM	B-Device
1403	I-Device
Model	O
N1	O
printer	O
's	O
TN	O
print	O
train	O
with	O
characters	O
which	O
simulated	O
the	O
IBM	O
Selectric	O
typewriter	O
Courier	O
72	O
type	O
ball	O
characters	O
identically	O
,	O
thereby	O
allowing	O
machine	O
printed	O
documents	O
to	O
be	O
manually	O
corrected	O
,	O
or	O
for	O
manually	O
inserted	O
text	O
,	O
as	O
required	O
.	O
</s>
<s>
An	O
IBM	O
program	O
RPQ	O
added	O
support	O
for	O
the	O
IBM	B-Device
3330	I-Device
direct	O
access	O
storage	O
facility	O
,	O
and	O
this	O
PRPQ	O
was	O
applied	O
by	O
most	O
users	O
of	O
ATS/360	O
that	O
had	O
migrated	O
to	O
early	O
IBM	O
System/370	O
systems	O
.	O
</s>
<s>
This	O
,	O
then	O
,	O
allowed	O
for	O
16-bit	O
disk	O
block	O
addresses	O
,	O
that	O
could	O
later	O
be	O
converted	O
to	O
the	O
expected	O
and	O
required	O
CCHHR	B-Application
format	O
.	O
</s>
<s>
This	O
PRPQ	O
was	O
also	O
applicable	O
to	O
IBM	B-Device
3350	I-Device
direct	O
access	O
storage	O
facilities	O
that	O
were	O
operated	O
in	O
3330	O
compatibility	O
mode	O
,	O
and	O
that	O
sacrificed	O
117MB	O
of	O
a	O
native	O
3350	O
's	O
317MB	O
total	O
capacity	O
in	O
order	O
to	O
implement	O
compatibility	O
mode	O
—	O
two	O
100MB	O
3330-equivalent	O
drives	O
on	O
one	O
3350	O
drive	O
)	O
.	O
</s>
<s>
Support	O
beyond	O
OS/VS/2	O
Release	O
1	O
(	O
SVS	O
)	O
was	O
not	O
offered	O
by	O
IBM	O
,	O
but	O
Peter	O
Haas	O
,	O
formerly	O
with	O
Litton	O
Systems	O
Inc	O
,	O
and	O
subsequently	O
with	O
Amdahl	O
Corp	O
,	O
added	O
support	O
for	O
MVS	O
in	O
general	O
,	O
and	O
for	O
APs	O
and	O
MPs	O
in	O
particular	O
,	O
and	O
a	O
large	O
number	O
of	O
ATS/360	O
systems	O
thereby	O
remained	O
in	O
use	O
well	O
into	O
the	O
MVS/370	O
era	O
,	O
until	O
the	O
2741	O
terminals	O
and	O
the	O
3705/4705	O
controllers	O
which	O
supported	O
these	O
were	O
removed	O
from	O
service	O
.	O
</s>
<s>
ATS/360	O
'	O
s	O
input/output	O
operations	O
utilized	O
EXCP	B-Application
exclusively	O
.	O
</s>
<s>
Task	O
switching	O
was	O
accomplished	O
asynchronously	O
as	O
an	O
extension	O
of	O
ATS/360	O
'	O
s	O
EXCP	B-Application
appendages	O
and	O
synchronously	O
as	O
an	O
extension	O
of	O
ATS/360	O
'	O
s	O
Type	O
1	O
Supervisor	B-Operating_System
Call	I-Operating_System
instruction	I-Operating_System
(	O
SVC	O
255	O
)	O
,	O
OS	O
Nucleus	O
control	O
section	O
IGC255	O
.	O
</s>
<s>
ATS/360	O
provided	O
its	O
own	O
access	B-Application
methods	I-Application
and	O
file	O
formats	O
.	O
</s>
<s>
Offline	O
"	O
format	O
and	O
print	O
"	O
tapes	O
could	O
be	O
printed	O
using	O
standard	O
OS	B-Application
utilities	I-Application
as	O
these	O
tapes	O
were	O
compatible	O
with	O
BSAM	B-Application
,	O
although	O
these	O
tapes	O
were	O
created	O
using	O
EXCP	B-Application
.	O
</s>
<s>
As	O
a	O
successor	O
to	O
ATS/360	O
,	O
IBM	O
marketed	O
ATMS	O
supporting	O
3270	B-Operating_System
terminals	I-Operating_System
,	O
which	O
ATS/360	O
did	O
not	O
.	O
</s>
<s>
ATMS	O
required	O
the	O
CICS	B-Application
data	O
communications	O
program	B-Application
product	I-Application
in	O
addition	O
to	O
the	O
ATMS	O
program	B-Application
product	I-Application
,	O
thereby	O
requiring	O
three	O
program	O
products	O
,	O
whereas	O
ATS/360	O
itself	O
was	O
"	O
free	O
"	O
.	O
</s>
