Joymaker by Frederik Pohl from The Age of The Pussyfoot
From Frederik Pohl’s 1966 novel:
The remote-access computer transponder called the “joymaker” is your most valuable single possession in your new life. If you can imagine a combination of telephone, credit card, alarm clock, pocket bar, reference library, and full-time secretary, you will have sketched some of the functions provided by your joymaker.
Essentially, it is a transponder connecting you with the central computing facilities of the city in which you reside on a shared-time, self-programming basis.