The Dream Machine: J. C. R. Licklider and the Revolution That Made Computing Personal

by M. Mitchell Waldrop

As promised, he taught Lick to program the LGP-30. (Since the code had to be written in a "hexadecimal" notation, in which the numbers 10 through 15 were abbreviated by the letters F, G, J, K, Q, and W, Lick soon came up with a mnemonic: "For God and Jesus Christ, Quit Worrying.")