The dod2015.dsk file contains a binary that launches an enhanced version of
Dungeons of Daggorath which includes a couple of qality of life features
like "ZPAUSE" and load/save of games on disk instead of tape.

Souce code for either the enhancemed version or the original ROM version is
not available due to the express wishes of the copyright holder of the
original Dungeons of Daggorath game.