The newest version is here.
I think it’s stabilizing. The rate of comments and submissions has been dropping.
How VDTs explain some heritage programs, and how bitmapped displays eventually obsolesced them. Explain why the ADM-3 was called "dumb" even though it was smart.
There’s also a mention of RS-323 on network gear.
Still nothing about XMODEM/YMODEM/ZMODEM – that’s probably the most requested addition left, but I really don’t see what could be interesting to say about them at this late date.
The reaction to this on my Patreon feed has been impressive. It seems to have driven $300-$400 of new subscriptions.