With the SCI engine, Sierra dropped disk-based copy protection schemes in favor of requiring the user to enter a word from the manual, as the new-generation games were designed primarily to be installed and run from a hard disk. "King's Quest IV" was the first commercially released game for IBM PC compatibles to support sound cards instead of only the standard built-in speaker. In addition to the familiar PC speaker and Tandy sound, it could utilize AdLib , Disney Sound Source, IBM Music Feature Card, or Roland boards. The new SCI engine allowed the game's designers to incorporate an orchestrated musical score along with more complex sound effects, a previously unattainable feat. To ensure an immersive soundtrack, composer William Goldstein was hired to write the game's musical score, totaling over 75 short music pieces.