Version 1.0 was written in VMS Pascal and completed in the summer of 1983. From around 1985 the source code was widely distributed under a licence that permitted sharing and modification but not commercial use. Koeneke's last release was Moria 4.7 in 1986 or 1987.
Moria inspired a number of derivative versions. Jim E. Wilson created Umoria, a modified version in C for UNIX. At the University of Washington a modified Pascal version named Imoria was developed, which has been ported to C by Steve Kertes. Angband was derived from Umoria at the University of Warwick.
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