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Starcraft 1 actually had this as an option for 4 player multiplayer.

Page 10 of the manual mentions the 4 player serial. https://www.scribd.com/doc/25478804/StarCraft-Manual

Was a pain to setup but we used to do it that way before we all went out and bought some IPX compatible network cards.

That's slightly different, in that Starcraft's system used RS232 in a standard point-to-point fashion. If you wanted to play with three or four people you had to daisy-chain and the one or two in the middle were effectively acting as routers.

This is hacking RS232 in to a bus network more or less.

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