I worked on this machine at the National and Grindlay’s Bank computer centre in Wilson Street.
I worked at National and Grindlay’s on and off between 1972 and 1974.
I also worked at the Equitable Life computer centre on the same model machine (running N & G work on nightshift).
It was not the first computer I worked on (I had previously worked on IBM 360 machines), but it was the oldest.
LEO stood for Lyons Electronic Office.
KDF6 Sept 1963 (16-bit word length), for commercial data processing – 30 were sold.
The KDF6 had a transister-driven ferrite core store holding a total of 24,576 characters.
Data and instructions were stored in individually addressable groups of 3-bit characters which were referred to as ‘triads’.