As others have pointed out, Pilot Ace (and I assume Deuce) had
'address of next instruction': getting this irght was what NPL called
'optimum coding': see
Wilkinson,J.H.,
An Assessment of the System of Optimum Coding used in the Pilot Automatic
Computing Engine at the National Physical Laboratory.
Phil. Trans. Roy. Soc. Ser. A 248(1955) p. 253 et seq.
James
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