“Steve Jobs” author Walter Isaacson is moving from the late Apple guru to the history of digital information for his next book. Isaacson told us Tuesday he’s just returned from Oxford, where he’s started research for his follow-up to best-selling “Jobs,” on “the birth of the digital revolution.” He said his next book begins with Ada Lovelace, the mathematician daughter of Lord Byron, considered to be the first programmer who envisioned the computer and software “around 1830.” He’ll next spend time at Bletchley Park, site of England’s famed World War II code-cracking operation and “Ultra” intelligence. He also recalled his first-ever book party, for “Kissinger: A Biography,” when Kissinger wasn’t initially very pleased about the book. Barry Diller arrived at Isaacson’s party in the Hamptons via helicopter straight from attending a birthday bash for Kissinger in Connecticut.