Caverns of Zoarre
aka: Dungeon of Mirador
Caverns of Zoarre started out as a TRS-80 game called Dungeon of Mirador, which never came out and which owed a lot to the DEC VAX 11/780 version of Telengard, which the author played around 1983. Caverns of Zoarre was an expanded version, finished over the course of a year.
The game was written using the IBM BASIC compiler, a renamed version of one of Microsoft's early BASICs, which ran so slow the author had to write assembly routines for direct screen write, which later went commercial as AdvBas and started the author's career as writing tools for programmers.
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Trivia contributed by General Error, Patrick Bregger.