In the early 1980s A-Z installed their first computer phototypesetter complete with a monochrome, or ‘green screen’, VDU. Road names and other map text was typed on a keyboard and stored on punch tape which was then run back through a reader to expose letters to film.
A later AM Varityper phototypesetter used a different storage and retrieval system along with a number of type discs, each containing four fonts. The appropriate disk was mounted inside the machine and spun with a strobe light exposing letters to film in a cartridge. The film sheets seen to the right here were used to match the font and point size of map text when ordering additional type.