This web site is to remember Post Office and BT services and people who provided these services from the 1950's to the 1980's



The following is the trunking diagram for the MRC

Dave Caldicott writes: You may be interested in the attached (part) schematic of an MRC MBO (Intermediate tape store) control unit which you may wish to publish on the website. The boxes on the diagram (e.g. item 38 "10FF1") were the ICs of the day, simple flip-flops consisting of two germanium PNP transistors and associated resistors encased in a block of epoxy resin! In fact all the MRC electronics used germanium transistors (OC71 type).

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