Wow who knew! Old game creators were simply geniuses.
That would have been crazy expensive to have that setup when it all first came out!
I actually had something even cooler.
Amiga 4000 with three 15" CRTs back in mid-90s.
You should check out Decino's Doom mechanic/code analysis videos on jewtube; Jon Carmack is like a comic book supervillain when it comes to intelligence.
Fun fact, the older versions used in the video include the infamous E1M4 "Swastika Server Room", which was edited into a vague shape starting with v1.666, I think.
As for multi-monitor setups, he went the lame route; vanilla doom is pointless when modern sourceports like Crispy Doom or Chocolate Doom are extremely faithful to vanilla, albeit much more feature rich for modern systems.
Personally, I don't like uber-faithful sourceports. Boom and ZDoom-based sourceports are way cooler and allow the game to keep up with the times with really cool additions. I've played Doom exclusively in VR with GZ3Doom and its forks for the last decade, and haven't looked back; multi-monitor is quaint by comparison.
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