NCR 500 Computer
The 500 was a development of the Class 390 which had been sold to many businesses and the US Military. Introduced in 1967 if became very popular with small to medium businesses.
(This is a link to the Language page)
Booklets
NCR Series 500 (From Data Processing Jan-Feb 1974)
Sheila Ormerod (nee Rushton)
at Darwen Paper Mill
