This blog post dives into another mostly TTL logic Ethernet board from the Xerox Alto: https://www.righto.com/2017/11/fixing-ethernet-board-from-vintage.html ht

This blog post dives into another mostly TTL logic Ethernet board from the Xerox Alto: https://www.righto.com/2017/11/fixing-ethernet-board-from-vintage.html https://www.righto.com/2017/11/fixing-ethernet-board-from-vi... It has a nice high level diagram of what each group of TTL chips is doing too: https://lh3.googleusercontent.com/-DpUyda3g2Yk/WgB7G_7o54I/AAAAAAABF-w/NOmnZtT-MooUpJBJ7PajB52coZerf8NWwCHMYBhgL/w9999/board-labeled.png https://lh3.googleusercontent.com/-DpUyda3g2Yk/WgB7G_7o54I/A...