I think I may have found the cause of the lock ups when trying to play King's Bounty on the DTK DATA-1000. It has some special sound circuitry as described in this patent "Binary system for generating sound US 5054086 A". I noticed that when I got the game to play from floppies there is music where I get clicks on the PCjr. The music is coming from the PC speaker, not the ones hooked to the soundblaster. I did a Google search on "DTK DATA-1000 sound" and the patent came up. The problem is that I have no idea what ports, interrupt, and memory it is using.
Does anyone know anything about this?