Blast from the past! I had that on my circa-1995 Mac, having dropped Doom like a hot potato the month before. That was long before Aleph One and the Big Sellout to Micro$oft!
I hear the Open Source project from the old source code is still around...
Thanks for reminding me of that, Gary, it must be ten years since my Mac achieved rampancy and I last played Marathon
Do unto others as you would have them do unto you, and sit in with the band whenever you can, to keep your chops up!