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Development began with ''[[Sabre (computer system)|SABRE]] (Semi-Automatic Business Research Environment)'', ''Deltamatic'', and ''PANAMAC''. From these, the ''[[Programmed Airline Reservations System]] (PARS)'' was developed. In 1969 the control program, ''ACP'', was separated from PARS. PARS kept the functions for processing [[airline]] reservations and related data.
In December 1979, ACP became known as ACP/TPF and then just [[Transaction Processing Facility|TPF]] (Transaction Processing Facility).<ref>{{cite web
| |date= May 14, 2002
|archive-url=https://web.archive.org/web/20041204030934/http://www.blackbeard.com/tpf/tpfhist.htm▼
|url= http://www.blackbeard.com/tpf/tpfhist.htm
|archive-date=2004-12-04 |access-date=2009-10-24 |date=May 14, 2002}}</ref> The transaction operating system became more widely implemented by businesses other than the major airlines, such as online credit card processing, hotel and rental car reservations, police emergency response systems, and package delivery systems.▼
▲ |archive-url= https://web.archive.org/web/20041204030934/http://www.blackbeard.com/tpf/tpfhist.htm
|archive-date= December 4, 2004
|access-date= October 24, 2009
▲
The last "free" release of ACP, 9.2.1, was intended for use in bank card and similar applications. It was shipped on a "[[Magnetic_tape_data_storage#IBM_formats|mini-reel]]" which contained a complete ACP system and its libraries for restoration to [[IBM 3340]] disk drives. From that complete system one could easily create derivative works. A [[hypervisor]] was included, which allowed OS/370 [[OS/VS1|VS1]] or VS2 ([[IBM Single Virtual Storage (SVS)|SVS]] or [[MVS]]) to be run as a "guest" OS under ACP itself. The end-user documentation, which was shipped with the tape, took almost 60 linear inches of shelf space.
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