i seriously love that sierra did their own in-house demake of King's Quest IV so it would run on 256K ram machines like the IBM PCjr
the AGI (256K) version uses a different parser, and half the resolution of the SCI (512K) version that most people played. side by side comparisons below. left: AGI, right: SCI
it was sold in a completely different box, and ordered directly from sierra by calling a toll-free number or mailing in an exchange form.