Ferranti F100-L
An 8-bit processor, with 16-bit addressing, but which could only access 32K of memory (1-bit for indirection).
The Ferranti F100-L was designed by a British company for the British Military.
The unique feature of the F100-L was that it had a complete control bus available for a coprocessor.
Any instruction the F100-L couldn't decode was sent directly to the coprocessor for processing.
Applications for coprocessors at the time were limited, but the design is still used in modern processors, such as the National Semiconductor {320xx} series.
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