Here's a walkthrough:
I remember calling elevators with the cracked version by Crystal, don't recall any problems apart from occasional lockup at startup (due to UAE setting most likely). If you want to enter doors that are locked with codes, press fire twice to get a code on screen, then type 'NMD', press fire twice again to open the door also works with Save Rooms.
Some useful keys:
<, >, Home, End, Pg Up, Pg Dn, Space, Enter, Arrows, F1, F2, F3, F4
Anyways. Did you keep your savings or save-states? I've only seen the first dozen or so rooms, I'd like to try it some more.