Photograph of a computer diagram entitled "PEGASUS ORDER MODIFICATIONS". Diagram shows the instruction modification for the Pegasus computer, an early vacuum tube computer built by Ferranti Ltd, Great Britain. The Pegasus 1 was first delivered in 1956 and the Pegasus 2 was delivered in 1959.

This is one of a set of photographs showing computers, computer components, computer structure diagrams and computer programmimg instructions, probably used as aids in teaching computing subjects. The diagrams and instructions relate to several pioneer models and systems of stored program computers dating back as far as the 1950s and including CSIRAC (originally known as CSIR Mark 1), Cirrus, Atlas, IBM System/360 , CDC 6600 System, and Illiac IV. The set of photographs were used by Trevor Pearcey, one of the two principal designers of CSIRAC.

Description of Content

Block diagram showing the order modification for the Pegasus computer.

Physical Description

Black and white photograph of a computing block-diagram.

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