yeah it looped some demos at the title screen.
first time I saw doom was on a friend's dad's next workstation. it was windowed, in black and white, and had no audio, but it was still the most amazing game I'd ever seen. that secret room where a giant pillar lowers down to reveal a fucking chainsaw, while out the windows you can see huge, alien mountains in the distance? that part BLEW MY FUCKIN MIND.