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Time-Line computer Archive Ltd is a not for profit company, our aim is to collect, restore and exhibit all types of early computers and electronics.

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Loopstra X1 Notes

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Bram J Loopstra's X1 Colloquium-Cambridge Notes










For a more detailed

description click on


Bram J Loopstra and Carel S. Scholtenare are widely regarded as the Designers of the Electrologica X1 Computer.

These are the handwritten notes Mr Loopstra used for reference when he gave a talk in Cambridge, about

the newly completed X1 Computer.


The X1 Computer first went into production in the Netherlands in 1958 and had a production run of

approximately 30 to 40 units between 1958 and 1965.

It's use of innovative Transistorised Circuitry was at the leading edge of computer design back in the late fifties, so

any lecture giving an incite into the construction and computer architectural techniques of the X1, would have

been very well received.








The X1 computer also has the distinction of being the first computer to use the Algol 60

compiler (ALGOrithmic Language 1960), implemented by E W Dijkstra and Jaap A. Zonneveld.



The hand written notes are in Dutch and are dated 27 November 1958.





















The Colloquium Talk was published in “Vol 2 Issue 1” (1959) of “The Computer Journal” and

is available free online through their website. “Link”