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The National Semiconductor DP8344 datasheet has some details on the Twinax interface and the 5250 terminal architecture as it was a later IC that supported both
by lowobservable 6y ago
The National Semiconductor DP8344 datasheet has some details on the Twinax interface and the 5250 terminal architecture as it was a later IC that supported both 5250 and 3270. I've not read the Twinax part in detail bit skimmed over it; it looks like an extension of the 3270 concept.
The topic has come up on Cctalk mailing list (see http://classiccmp.org/pipermail/cctalk/2019-November/051008.html http://classiccmp.org/pipermail/cctalk/2019-November/051008....), and I think Alan was looking to build what you are talking about but was looking for some help reverse-engineering the higher-level protocol.