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I use a similar method to share Internet with my Tandy 1000 via an old laptop I've used as a server for years. LAN via Ethernet coming in, network forwarding via iptables, and serial null modem cable to the Tandy. Unfortunately, I don't get anywhere near 750-800 Mbps but 6 Kbps :)

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You should take a look at serial-to-ethernet converters like the USR-TCP232-T2. I use one with my VIC-20 to telnet into BBSs. Uses a modified AT command set, so you can actually control it a bit like a modem. Picked it up for $10 off eBay a few years back.

Hey, thanks! I might actually use this for another project.

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