Pale Fire, a poem in heroic couplets, of nine hundred ninety-nine lines, divided into four cantos, was composed by John Francis Shade (born July 5, 1898, died July 21, 1959) during the last twenty days of his life, at his residence in New Wye, Appalachia, U.S.A. The manuscript, mostly a Fair Copy, from which the present text has been faithfully printed, consists of eighty medium-sized index cards, on each of which Shade reserved the pink upper line for headings (canto number, date) and used the fourteen light-blue lines for writing out with a fine nib in a minute, tidy, remarkably clear hand, the text of his poem, skipping a line to indicate double space, and always using a fresh card to begin a new canto...As a rule, Shade destroyed drafts the moment he ceased to need them: well do I recall seeing him from my porch, on a brilliant morning, burning a whole stack of them in the pale fire of the incinerator before which he stood with bent head like an official mourner among the wind-borne black butterflies of that backyard auto-da-fé. But he saved those twelve cards because of the unused felicities shining among the dross of used draftings."
Nabokov was not as precise as Kinbote was, when counting his manuscripted index cards ("there are about 1075"), to Shade's even numbered (80 + 12) ninety-two, set down in twenty days.
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PS: Thank you to James Twiggs (again), and to Charles H. Wallace, for the off list links to Socher's article.