was written in BCPL.

An early compiler, bootstrapped in 1969, by starting with a paper tape of the O-code of Richards's Atlas 2 compiler, targeted the ICT 1900 series. The two machines had different word-lengths (48 vs 24 bits), different character encodings, and different packed string representations--and the successful bootstrapping increased confidence in the practicality of the method.

By late 1970, implementations existed for the

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