Source: https://web.archive.org/web/20210227171641/https://twitter.com/Siliconinsid/status/1365699808485404674
Text: IBM 50G6144 (1993)
@kenshirriff 's mystery die! The 50G6144 is an integrated 16/4Mbps Token Ring network interface, IBM proprietary's competitor to Ethernet. The chip is fabricated in IBM 1µm CMOS process and has a custom 16bit processor (lower right) #IBM #TokenRing

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Die