In 1981, Apple's leading competitor in the world of consumer ("novice") computer users was IBM, but the market was about to experience a deluge of also-rans and other silent partners in PC history, including the multinational descendant of Standard Oil, Exxon. The oil giant had been quietly cultivating a position in the microprocessor industry since the mid-1970s via the rogue Intel engineer usually credited with developing the very first commercial microprocessor, Federico Faggin, and his startup Zilog 

Faggin had ditched Intel in 1974, after developing the 4004 four-bit CPU and its eight-bit successor, the 8008. As recounted in Datapoint: The Lost Story of the Texans Who Invented the Personal Computer, Faggin was pissed about Intel's new requirement that employees had to arrive by eight in the morning, while he usually worked nights. Soon after leaving Intel and forming Zilog, Faggin was approached by Exxon Enterprises, the investment arm of Exxon, which began funding Zilog in 1975. 

None of this is mentioned on ExxonMobil's ?current "our history" page.