Chilton::ACL::Atlas Architecture

Further reading □しろいしかく Overview □しろいしかく About Ferranti □しろいしかく Brochure □しろいしかく Architecture □しろいしかく Architecture □しろいしかく 1-Level Storage □しろいしかく Words □しろいしかく Instructions □しろいしかく Order Code □しろいしかく Animated □しろいしかく Hardware □しろいしかく Fixed Store □しろいしかく Supervisor □しろいしかく Overview □しろいしかく Scheduler □しろいしかく Core Memory □しろいしかく Atlas Card □しろいしかく Atlas Console □しろいしかく Console Details □しろいしかく Chilton □しろいしかく Chilton Atlas □しろいしかく Downstairs □しろいしかく Manchester □しろいしかく Manchester Atlas □しろいしかく London □しろいしかく London Atlas □しろいしかく London Software □しろいしかく Atlas II □しろいしかく Atlas 2 Brochure □しろいしかく Titan Autocode □しろいしかく Cambridge Atlas □しろいしかく Closure □しろいしかく Atlas Closure

ACL ACD C&A INF CCD CISD Archives

Further reading ⇓

□しろいしかく Overview □しろいしかく About Ferranti □しろいしかく Brochure
Architecture
□しろいしかく Architecture □しろいしかく 1-Level Storage □しろいしかく Words □しろいしかく Instructions □しろいしかく Order Code □しろいしかく Animated
Hardware
□しろいしかく Fixed Store □しろいしかく Supervisor □しろいしかく Overview □しろいしかく Scheduler □しろいしかく Core Memory □しろいしかく Atlas Card □しろいしかく Atlas Console □しろいしかく Console Details
Chilton
□しろいしかく Chilton Atlas □しろいしかく Downstairs
Manchester
□しろいしかく Manchester Atlas
London
□しろいしかく London Atlas □しろいしかく London Software
Atlas II
□しろいしかく Atlas 2 Brochure □しろいしかく Titan Autocode □しろいしかく Cambridge Atlas
Closure
□しろいしかく Atlas Closure

The main parts of Atlas 1 consist of:-

The control unit: responsible for pipelined instruction decoding and initiating the relevant action
Floating Point Arithmetic Unit: for all floating point arithmetic operations
Integer Arithmetic Unit: for all integer and character operations
The Supervisor: schedules the running of jobs and switching as necessary. Atlas was probably the first machine whose control program warranted being called an operating system.
The storage system: programs could address a million words of store which either resided in main memory or on drums. The Supervisor made this appear like a 1-level storage system by paging blocks of information in and out of main store.
Input and output devices: the main backing store was either 1 inch Ampex pre-formatted tape or a fixed disc. Compatible IBM 7-track magnetic tape decks were also available.

The following diagram shows the component parts of Atlas 1:-

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