I snagged one of those keyboards at an auction. Haven't been able to get it to work with a modern PC. Hard to find much info on this line of computers.

Are there any writeups of the pinout or hopefully the protocol?

I made a converter once for a Sun keyboard before https://www.pjrc.com/sun-type-s-keyboard-retrofit/ / https://github.com/jareklupinski/sun2usb

Why did this article not include any dates? When was this released?

> All three were introduced on schedule at the Hannover Faire in April 1983 with staggered deliveries for the 4107 and 4109.

> This March 1984 issue of Tek Quality

The sales material on the site has some dates on it

Great museum.