Atlas
From Computer History Wiki
Atlas was a mainframe computer built by a consortium of the University of Manchester, Ferranti, and Plessey. It is notable for being the first computer to have virtual memory (called 'one-level store').
Its addresses were 24 bits, in 48-bit instructions; the address space allocated to main memory was 20 bits. Its main memory initially consisted of 16K 48-bit words of core memory, which was allied with 96K words of drum in four drives.
Further reading
- Raúl Rojas, Ulf Hashagen, The First Computers: History and Architectures; Frank H. Sumner, "The Atlas Computer"
