The program bank was a component of the Constitution-class starship computer.

In 2267, Spock tested the USS Enterprise's program bank by playing chess with it, winning five games. (He explained that he had programmed it for this game months previous). This test was instrumental in proving that the computer was not infallible, and therefore, there was a strong possibility that Kirk was innocent in Benjamin Finney's apparent death. (TOS: "Court Martial")