For those interested in the LINKS network, I found an interview with Eiji TAKI the president of Nippon Telenet the company running LINKS. Note this company differs from Nihon Telenet who developed Valis and Androgynus.
Title: Legendary "THE LINKS" - The dream I bet on the world's first network game
https://www.cesa.or.jp/efforts/keifu/taki/taki01.html
https://www.cesa.or.jp/efforts/keifu/taki/taki02.html (recommended)
https://www.cesa.or.jp/efforts/keifu/taki/taki03.html
https://www.cesa.or.jp/efforts/keifu/taki/taki04.html
Google translation yields quite good result. You can find his story of building a nationwide network from scratch when there wasn't such thing as network.
Interesting facts are that the LINKS had a direct gateway with Konami, the Daiva game supported online chat, one of the employees later became an Evangelion scriptwriter, and the LINKS's annual income was only 1/4 of the investment... :(
