Validity and Correctness in LEO I and II

Abstract of the presentation at the roundtable What is a (computer) program? at the prelaunch of the project PROGRAMme in Paris, at the CNAM – Conservatoire national des arts et métiers, on the 20th of October 2017.

The presentation is an historical reconstruction of the procedures to ensure validity and program correctness in the early examples of business computers: the focus of the talk is the hardware testing, data validation and program correctness techniques designed for LEO I and II in the UK during the 1950s. Continue reading “Validity and Correctness in LEO I and II”

Reflections on Identity and Copy of Programs

Abstract of the presentation at the roundtable `What is a (computer) program?’ at the prelaunch of the project PROGRAMme in Paris, at the CNAM – Conservatoire national des arts et métiers, on the 20th of October 2017.

The problem of identity is a long-standing one in philosophy. In turn, it is a crucial one for the Philosophy of Computer Science, and in particular for answering the question ‘what is a program?’. Two major strands in the history of such conceptual investigation can be found. Continue reading “Reflections on Identity and Copy of Programs”

Final Project in Business Information System on LEO I @ MDX Mauritius

Mr. Henry-Jones W. Johnson, student in the BSc in Business Information Systems at Middlesex University Mauritius has completed his studies with a final project titled “LEO 1 – Recreating the World’s First Business Computer”. Henry-Jones was supervised by Dr. Amar Seeam. The project included an historical overview of the context in which LEO I was built and entered production, and a Java-Based simulation for some operations available on the original machine.