<s>
IBM	B-Application
Airline	I-Application
Control	I-Application
Program	I-Application
,	O
or	O
ACP	O
,	O
is	O
a	O
discontinued	O
operating	B-General_Concept
system	I-General_Concept
developed	O
by	O
IBM	O
beginning	O
about	O
1965	O
.	O
</s>
<s>
In	O
contrast	O
to	O
previous	O
airline	O
transaction	B-Application
processing	I-Application
systems	I-Application
,	O
the	O
most	O
notable	O
aspect	O
of	O
ACP	O
is	O
that	O
it	O
was	O
designed	O
to	O
run	O
on	O
most	O
models	O
of	O
the	O
IBM	B-Application
System/360	I-Application
mainframe	O
computer	O
family	O
.	O
</s>
<s>
Development	O
began	O
with	O
SABRE	B-Application
(	O
Semi-Automatic	B-Application
Business	I-Application
Research	I-Application
Environment	I-Application
)	O
,	O
Deltamatic	O
,	O
and	O
PANAMAC	O
.	O
</s>
<s>
From	O
these	O
,	O
the	O
Programmed	B-Application
Airline	I-Application
Reservations	I-Application
System	I-Application
(	O
PARS	B-Application
)	O
was	O
developed	O
.	O
</s>
<s>
In	O
1969	O
the	O
control	O
program	O
,	O
ACP	O
,	O
was	O
separated	O
from	O
PARS	B-Application
.	O
</s>
<s>
PARS	B-Application
kept	O
the	O
functions	O
for	O
processing	O
airline	O
reservations	O
and	O
related	O
data	O
.	O
</s>
<s>
In	O
December	O
1979	O
,	O
ACP	O
became	O
known	O
as	O
ACP/TPF	O
and	O
then	O
just	O
TPF	B-Operating_System
(	O
Transaction	B-Operating_System
Processing	I-Operating_System
Facility	I-Operating_System
)	O
.	O
</s>
<s>
The	O
transaction	O
operating	B-General_Concept
system	I-General_Concept
became	O
more	O
widely	O
implemented	O
by	O
businesses	O
other	O
than	O
the	O
major	O
airlines	O
,	O
such	O
as	O
online	O
credit	O
card	O
processing	O
,	O
hotel	O
and	O
rental	O
car	O
reservations	O
,	O
police	O
emergency	O
response	O
systems	O
,	O
and	O
package	O
delivery	O
systems	O
.	O
</s>
<s>
It	O
was	O
shipped	O
on	O
a	O
"	O
mini-reel	O
"	O
which	O
contained	O
a	O
complete	O
ACP	O
system	O
and	O
its	O
libraries	O
for	O
restoration	O
to	O
IBM	B-Device
3340	I-Device
disk	O
drives	O
.	O
</s>
<s>
A	O
hypervisor	B-Operating_System
was	O
included	O
,	O
which	O
allowed	O
OS/370	O
VS1	B-Application
or	O
VS2	O
(	O
SVS	B-Application
or	O
MVS	B-Application
)	O
to	O
be	O
run	O
as	O
a	O
"	O
guest	O
"	O
OS	O
under	O
ACP	O
itself	O
.	O
</s>
<s>
See	O
also	O
IBM	O
Airline	B-Application
Control	I-Application
System	I-Application
(	O
ALCS	O
)	O
,	O
a	O
variant	O
of	O
TPF	B-Operating_System
specially	O
designed	O
to	O
provide	O
all	O
the	O
benefits	O
of	O
TPF	B-Operating_System
(	O
very	O
high	O
speed	O
,	O
high	O
volume	O
,	O
high	O
availability	O
transaction	O
processing	O
)	O
but	O
with	O
the	O
advantages	O
such	O
as	O
easier	O
integration	O
into	O
the	O
data	O
center	O
offered	O
by	O
running	O
on	O
a	O
standard	O
IBM	O
operating	B-General_Concept
system	I-General_Concept
platform	O
.	O
</s>
