Editing Compatible Time-Sharing System (section)

===Intrex===
[[File:Intrex on CTSS.png|thumb|Diagram of the Intrex running on CTSS]]
The Intrex Retrieval System ran on CTSS. Intrex was an experimental, pilot-model machine-oriented bibliographic storage and retrieval system with a database that stored a catalog of roughly 15,000 journal articles. It was used to develop and test concepts for library automation.<ref>{{cite report |url=https://files.eric.ed.gov/fulltext/ED056732.pdf |title=Project Intrex - A Brief Description |last=Overhage |first=Carl F. J. |date=1971 |website=[[Education Resources Information Center|ERIC]] |publisher=MIT |access-date=March 8, 2022}}</ref><ref>{{cite report |url=https://files.eric.ed.gov/fulltext/ED070506.pdf |title=Intrex Buffer-Controller Display System Operation and Software |last=Kehr |first=James E. |date=September 1972 |website=[[Education Resources Information Center|ERIC]] |publisher=MIT |access-date=March 8, 2022 |archive-date=June 25, 2024 |archive-url=https://web.archive.org/web/20240625150302/https://files.eric.ed.gov/fulltext/ED070506.pdf |url-status=live }}</ref><ref>{{cite report |url=https://files.eric.ed.gov/fulltext/ED057829.pdf |title=The Intrex Retrieval System Software |last=Hurlburt |first=Charles E. |date=September 15, 1971 |website=ERIC |publisher=MIT |access-date=March 8, 2022 |archive-date=June 25, 2024 |archive-url=https://web.archive.org/web/20240625150302/https://files.eric.ed.gov/fulltext/ED057829.pdf |url-status=live }}</ref> A deployment of three BRISC [[Cathode-ray tube|CRT]] consoles for testing at the MIT Engineering Library showed that it was preferred over two other systems, ARDS and DATEL.<ref>{{cite report |url=https://files.eric.ed.gov/fulltext/ED060899.pdf |title=Project Intrex. Semiannual Activity Report, 15 September 1971 - 15 March 1972. |id=Intrex PR-13 |last=Overhage |first=Carl F. J. |date=March 15, 1972 |website=ERIC |publisher=MIT |access-date=March 17, 2022 |quote=Since September 27, 1971, the BRISC has been available at the Engineering Library station on a two-hours a day basis. |archive-date=June 25, 2024 |archive-url=https://web.archive.org/web/20240625150303/https://files.eric.ed.gov/fulltext/ED060899.pdf |url-status=live }}</ref>