Difference between revisions of "Atlas"
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'''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'). | '''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 [[main memory]] consisted of 16K 48- | + | Its [[address]]es were 24 bits, in 48-[[bit]] [[instruction]]s; the [[address space]] allocated to [[main memory]] was 20 bits. Its main memory initially consisted of 16K 48-bit [[word]]s of [[core memory]], which was allied with 96K words of [[drum]] in four [[drive]]s. |
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| + | ==Further reading== | ||
| + | |||
| + | * Raúl Rojas, Ulf Hashagen, ''The First Computers: History and Architectures''; Frank H. Sumner, "The Atlas Computer" | ||
==External links== | ==External links== | ||
| − | * [ | + | * [https://www.andrew.cmu.edu/course/15-749/READINGS/optional/fotheringham61.pdf Dynamic Storage Allocation in the Atlas Computer] |
| + | * [http://classweb.ece.umd.edu/enee447/atlas.pdf One-Level Storage System] | ||
{{semi-stub}} | {{semi-stub}} | ||
[[Category: Mainframes]] | [[Category: Mainframes]] | ||
Revision as of 16:59, 31 October 2022
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"
