[ryandrake]

Glad you mentioned DOOM! Sometimes people forget that DOOM supported multiplayer as early as December 1993, via a serial line and February 1994 for IPX networking. 4 player games on a LAN in 1994! On release, TCP/IP wasn't supported at all, but as the Internet took off, that was solved as well. I remember testing an early-ish version of the 3rd party iDOOM TCP setup driver from my dorm room (10 base T connection) when I was supposed to be in class, and it was a true game changer.

[jandrese]

What was even more amazing is you could daisy chain serial ports on computers to get multiplayer Doom running. One or more of those links could even be a phone modem.

Downside is that your framerate was capped to the person with the slowest computer, and there was always that guy with the 486sx25 who got invited to play.

[bombcar]

Or slave two copies to yours and get "side view" which was only supported for a few releases IIRC - https://doomwiki.org/wiki/Three_screen_mode

[badocr]

Yes, Doom with multi-monitors! There's (at least) one video on Youtube showing it in action with 3 monitors plus a fourth one with the map: https://www.youtube.com/watch?v=q3NQQ7bPf6U#t=1798.333333

[bigjimmyk3]

Someone tried running that in one of the campus computer labs when I was a student, and the (probably misconfigured) IPX routers amplified it into... a campus-wide outage. Seems weird to me, but that's what the big sign on the door said the next day.

The perpetrator was never caught.