High Quality Content by WIKIPEDIA articles! KDF9 was an early British computer designed and built by English Electric, later English Electric Leo Marconi, EELM, later still incorporated into ICL. It first came into service in 1964 and was still in use in 1980 in at least one installation. The present article presents a synoptic overview of the architecture of the KDF9; for a more complete account, see The English Electric KDF9', and The Hardware of the KDF9', at the links below.