Photograph of a computer diagram entitled "Figure 4. Mechanical drive system.". Diagram shows the arrangemnet of the mechanical drive system of the Harvard Mark I Calculator, an electromechanical computer originally known as the IBM Automatic Sequence Controlled Calculator (ASCC). Built by IBM, the ASCC was moved to Harvard University in 1944 and became known as the Harvard Mark 1. This was the first large-scale automatic digital computer in the USA.

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.

Description of Content

Diagram showing the mechanical structure of the Harvard Mark I computer,also known as the IBM Automatic Sequence Controlled Calculator (ASCC).

Physical Description

Black and white photographic print of a computer programming diagram.

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