Photograph of a diagram entitled "Fig Fig 44. Basic principle of the automatic sequence controlled calculator". Diagram shows pointer operation on the Harvard Mark 1 Calculator, an electromechanical device built by IBM and originally known as the Automatic Sequence Controlled Calculator. It was installed at Harvard University in 1944,

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 basic structure of the Harvard Mark I automatic sequence controlled calculator.

Physical Description

Black and white photographic print of a computer programming diagram.

More Information