Ferranti Argus 300

The design of the Argus 300 was started in 1963 as a much faster machine featuring a fully parallel-architecture arithmetic logic unit, as opposed to the earlier and much slower serial units. Its instruction set was nevertheless fully compatible with the Argus 100. The 300 was very successful and used throughout the 1960s in various industrial roles. There was a variant of the 300, the Argus 350, which allowed external access to its core to allow direct memory access.