Tub file

The tub file was an early random access memory technology in which pre-punched punched cards that contained frequently used information were stored in a file for reuse. Usually such tub files would contain a series of related data — one for each item sold in a store, for example — so that data would be easy to find and reuse.

References

• Crosby, Kip; Elbaum, Max (April–June 1994). "Just Like the Golden Gate Bridge: Rey Johnson and Jack Harker talk about RAMAC". The Analytical Engine: Journal of the Computer History Association of California 1 (4): 4–5. ISSN: 1071-6351. Archived from the original on 2007-04-07. http://web.archive.org/web/20070407135256/http://www.chac.org/engine-ascii/engv1n4.txt. Retrieved 2007-06-22. 
• Anderson, Arthur O. (2001). "Reynold B. Johnson: 1906–1998". Memorial Tributes: National Academy of Engineering (National Academy Press) 9: 141. ISSN: 1075–8844, ISBN 0-309-07411-8. http://books.nap.edu/openbook.php?record_id=10094&page=141. Retrieved 2007-06-22.