https://www.cs.york.ac.uk/rts/static/papers/R:N.C.:Audsley:2006.pdf might be of interest.
They turned up at an embedded systems show at Birmingham NEC about that time.
I was attending independently, but it was interesting to see,.
Wandering about some boring other stands, I found one that was showing off a small embedded device running a remarkable system.
There was source code on the screen.
"Hmm", I asked, "what's the language it's running?"
Lars Bok [for it was he], proudly, "It is SmallTalk!" in 64k [I think] on a micro with a real-time garbage collector and in-service code updating on the fly.
Just fantastic. We bemoaned the boring nature of most of the stands. I mentioned Styx-on-a-Chip and he wandered off to have a look, returning to say it was also interesting.
I forget the name of the system, but eventually the company was sold on or got different investors in, who turned it into a Java thing. As usual.