These pages presently show the following images :-
1) Pages from an ICT salesman's 542/550 brochure dated- late fifties
2) Photographs of a "turret" i.e. one of the machine's pluggable valve technology logic elements. These turrets are little known and represent a "stepping stone" technology between totally hard-wired machines and those using removable printed circuit boards.
3) This photograph shows the "gates" into which the turrets are plugged, the control panel and the plug board.
The author is also in possession of some ICT Letchworth Training School "hand-outs" for this machine, but they are far too large for reproduction here.
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All text © 2007 D.C.Adams
Rev080313