Summary

Photograph of a diagram entitled "Fig 6. Switches and storage counters". Diagram shows the electrical layout of the Harvard Mark I Calculator, an electromechanical device 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 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

Block diagram showing the electrical 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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