A Token Ring Media Access Unit or MAU
https://media.mas.to/masto-public/media_attachments/files/111/564/152/527/339/780/original/db8a027bccb806f3.jpeg
Doom LAN parties were not for the faint of geek.
I recall Doom only supported Novell IPX protocol at the time (no IP), so you needed Novell 286 or 386, which itself required a dedicated server.
On the plus side, it wasn't fussy about the physical layer so ArcNet and Token Ring were acceptable!
Much later came IPX over IP.
Good times!
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