In the last episode, Wendy Woods mentioned that during her testing of IBM PC software compatibility with the PCjr that only the version of Borland’s Sidekick without copy protection worked with the latter machine. The version with copy protection was incompatible with the PCjr.

You might wonder, then, why anyone would have purchased the copy protected version in the first place. The answer was likely price. According to Borland’s advertising from the time–early 1985–the protected version cost $55, while the non-protected version ran $85.