Gallery: The evolution of the PC

Commodore PET 2001

In 1977 the Commodore PET 2001 arrived with a built-in monochrome monitor, a 1MHz processer and up to 8KB of memory.

It still cost £850 (US $795 in 1977)- but the closely set keyboard, was dubbed the "chiclet keyboard" because it resembled the popular US chewing gum.

Photo credit: Nick Heath/silicon.com