IBM premiered the PCjr in 1984; it did not sell well and, therefore, neither did "King's Quest". However, later that year Tandy Corporation released the Tandy 1000, an IBM PC compatible that succeeded where the PCjr failed. "King's Quest" caused a sensation in the burgeoning market of PC-compatible computers, and Sierra sold more than half a million copies. They ported it to other computing platforms, including the Apple II, Apple IIGS, Macintosh, Amiga, and Atari ST, but the PC remained the primary platform for their games.