Writing on his website, the author notes: "One [of the books] was planned for each of the major machines at the time, the Apple II, the TRS-80 and the IBM PC Jr. Only the first two were published, as the Junior didn't survive much past its introduction. Nor should it have. The combined advances for these books allowed me to pay off the cost of my original Apple II+, so it was worth the effort."
The original TRS-80 type-in version is for the Model 4.
In 2022, Jim Gerrie created a version of this game for the TRS-80 MC-10; see his blog for details.
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