Duplicated copies of Pegasus Input and Output Teleprinter Code (December 1954) and F.P.C. tape code, with many manuscript corrections and annotations by Strachey.

These are based on, but not identical with the draft in MS. Eng. misc. b. 281/D.70 above. Dr. C. Phelps notes that the eventual code adopted came to light for the first time in Strachey's scribbled changes on page 6 of the document.