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Leo III Logic Board

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One of the many logic boards that would have been installed in a LEO III computer.

Board no: S101/30N1/3; S101/30P2/3

Serial no: S006756

The board is part of our onsite display for the National Lottery Heritage-Funded LEO project.

The first Leo III was completed in 1961, not long before the company was merged with the English Electric Company, which not only broke up the team that had done so much for the UK computer industry, but also marked the decline of the computer industry in the country.

Incredibly some machines were still in use in the General Post Office until 1982.

Manufacturer: LEO Computers LTD
Date: early 1960s

Related Topics:

LEO III

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Leo III Logic Board Articles:

Item	Manufacturer	Date
Barry Hooper, Programmer Shell Australia		Unknown
Hackney Archives		Unknown
Higher Systems		Unknown
Steve Farrow: Interview	Leo Computers Society	Unknown
Graham Briscoe: Reminiscence		Unknown
Dick Cromwell: LEO Memories		Unknown
Ray Dawson: Reminiscences		Unknown
Mike Finlay: Memories of LEO		Unknown
John Simon Florentin, Computer Operator		Unknown
David Holdsworth: Reminiscence		Unknown
Maurice Bonney: Memoir	LEO	Unknown
Ron Marshall: Reminiscence		Unknown
Ray Smith: Reminiscences of a LEO III Operator and Intercode Programmer		Unknown
Anthony Robin Davies: Commentary	LEO	Unknown
Mike Tyzack's story with Leo computers		Unknown
Faith Van Rooyen		Unknown
Harry Warner: Reminiscence		Unknown
Emil Gottwald: Reminisence	LEO	Unknown
Pat Whitaker: Commentary		Unknown
Norman Witkin: Memoir of working with LEO in South Africa		Unknown
Denis Hitchens: Reminiscence	LEO	Unknown
New Computers for the Post Office		Unknown
Joe McNulty: Memoir	LEO	Unknown
Chris Reynolds: Memoir	LEO	Unknown
Mike Smith: Memoir	LEO	Unknown
Michael Wilson: Commentary	LEO	Unknown
Andrew Wylie		Unknown
Nigel Furness: Reminiscence		Unknown
I Love ICL		Unknown
Museums Victoria, Melbourne		Unknown
Peter Baker: Reminiscence		Unknown
John Fletcher: Reminiscence		Unknown
Brian Grimshaw: Reminiscence		Unknown
Penny Woodward: Reminiscence		Unknown
Chris Parker: Comment		Unknown
Alison Taylor: Reminiscence		Unknown
On-line Leo III User Manuals		Unknown
Brian Skillen: Memories of my time operating LEO I		Unknown
Explore our LEO Computers Collection		Unknown
Electronic Computers in the Office		1956
Introducing LEO III		12 Aug 1960
Computers for Shell-Mex and BP		1962
Current Developments in Commercial Automatic Programming		1 Aug 1962
Wythenshawe: The Second Computer Centre for Shell-Mex and BP		1963
The Management of a Large Commercial Computer Bureau	LEO	1964
An Introduction to Compiler Writing		Jan 1965
Hardware in Europe		May 1965
The Brains Behind The Buttons		5 Jan 1967
LEO III/7 Fire		Sep 1967
LEO III: a rave from grave		4 Sep 1975
Interview with Les Turtle		1990
London’s Home Movies		2003
Timesharing History: the UK Story		2004
Report on visit of inspection to LEO III/ in Edinburgh Museum		2007
LEO Computer Reunion 2010		18 Apr 2010
Tony Morgan: Interview	Leo Computers Society	8 Nov 2011
John Daines: Interview	Leo Computers Society	26 Apr 2012
LEO Computers in Australia	LEO	2013
Software, A Progress Report on the LEO III Intercode and Master Routine Emulator	LEO	2013
British transistor manufacturers in the 1950s		2016
Derek Jolly: Interview	Leo Computers Society	11 Apr 2016
Patrick Blakes: Interview	Leo Computers Society	27 Jul 2016
Peter Bird: Interview		6 Sep 2016
Tony Earnshaw: Interview	Leo Computers Society	16 Feb 2017
John Page: Interview		11 Apr 2017
Ian Bruce: Interview		5 Jul 2017
Barry Fox: Interview		19 Jul 2017
A Virtual LEO III		2018
Brian Mills: Interview		27 Feb 2018
Alan Hooker: Interview		21 Nov 2018
Brian Hobson: Reminiscences	LEO	18 Dec 2018
Software - LEO III		2020
Michael Hancock		2020
Michael Guy: LEO Master Routine		2020
John Daines: Reminiscence		2020
Robin Davies: Reminiscence		2020
John V Panter: Reminiscence		2020
Tom Brooks: Memoir	LEO	2020
John Gardner: Interview		Mar 2020
Greg Wojtan: My Days with LEO		2021
Peter Guest: Reminiscence written by Margaret Guest		2021
Wendy Forward: Memoir by her daughter Anna C Page		2021
Bill Jack, English Electric Engineer (team leader) Ravenscraig LEO III, Recollection		2021
Helen Clark (Helen Jackson): Reminiscence		Apr 2021