President's Choice Trivia (PC Booter)
ProgrammingPresident's Choice was written in UCSD Pascal, which produces machine-independent, portable code. In contrast to a compiled program, this 'p-code' is interpreted at runtime by a virtual machine loaded on boot - the p-System engine.
The full UCSD p-System IV was a self-contained OS and programming environment, available for a number of computer platforms and designed to easily port software across systems. IBM offered it as a choice of operating system for its original PC, but it was quickly forgotten as PC/MS-DOS won the popularity contest.