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I was weak and I bought something from eBay. A $47 LEGO interface A box from 1987. It has support for the BBC Micro 
@bbcmicrobot@mastodon.me.ukAmazing that before Mindstorms, #arduino or Scratch, #lego had their own hw, sw and courseware for teaching embedded systems to kids in #80s.
Someone put scans of the teacher and student materials here (non https site) http://www.mybbcmaster.nl/educ_lego.html
I think you can plug this LEGO interface directly into the BBC Micro User Port! (need to double check pins map to the right places, this box supports Apple II and others too)
@bbcmicrobot fantastic!
The module using this was the *only* one involving any programming my entire GCSE in IT in 89/90.
I remember building the automatic door example, and adding a travelator to it that operated once it was open.
OMG what a blast from the past! My Primary school had that exact one, and I used to get called out of my class to come and make it do stuff for the teachers. Probably about 1987?
You didn't have to rely on LEGO Lines either, you could control is direct from BBC BASIC so you could interface to a joystick and keyboard for controls, and have on-screen feedback. It felt like living in the future!
@bbcmicrobot I wanted it so bad but we were poor.
@hosford42 pretty much why I am now going back and buying it now on eBay
@bbcmicrobot @SinclairSpeccy talk about lock-in
@bbcmicrobot much later... We couldn't afford the LEGO's robot kits (90s/2000s), but I did get to build one during a visit to LEGO Land in San Diego. I had no idea they were doing that since the 80s!
@bbcmicrobot not Lego, but around the same era in middle school we had a BBC Micro driving a little cart round a maze we made, with a bumper switch... I guess around 1990? Just on the transition of school computers to PC-likes for doing Serious Office Things...
@bbcmicrobot Those match the numbering in the user guide. Page 496 (Appendix K) pl10 connector.
@bbcmicrobot I love that they translated that table to each language. Paper was cheap back then?