Purchasing software in the late 1980s often required the buyer to carefully read the label, especially if you owned a personal computer that purported to be “compatible” with IBM. Take this diskette for the IBM port of The Bard’s Tale III: Thief of Fate:

As you can see, the disk label states the game works with the “IBM PC, XT and 100% compatibles,” as well as the Tandy 1000. Tandy is the only compatible listed by name, as by this point–this was a 1990 release–the 1000 line was widely considered the gold standard for IBM compatibility.