Matthew Kirschenbaum has written a fascinating book — Track Changes: a Literary History of Word Processing — and in following a link to interviews with him I came on this lovely image, which made me laugh out loud.
Also: word processor seemed such a strange term for a tool designed (presumably) to aid composition. I always thought of it alongside the food processor that became a staple in so many modern kitchens (though never in ours), the whole point of which was to reduce everything to an undifferentiated pulp. (Or so I thought, anyway, never having used one.)
Kirschenbaum clears up the mystery: it seems that the ‘processor’ term came from IBM, who were marketing an office document-processing system which envisaged a process which took the document from initial outline to finished printed version to filed-away copy.