Hey thanks! That’s my favorite one! Congratulations!
Your 150 supports WristApps, which are little 6805 binaries that get uploaded into ~780 KiB storage over the Datalink connection! It’s tiiiiiny, but enough to have programs for useful things like countdown timers, small games, etc. I’m kinda thinking of making a collection of links to WristApps somewhere to keep these things from getting lost to time.
Here’s a fun example!
https://www.pouet.net/prod.php?which=87121
And here’s a video of it :D
https://www.youtube.com/watch?v=T9GiiOL-B8U
For the Notebook Adapter emulator, the RPi Picos should work great, too! Adjust the GPIO pin to the onboard LED, and it should just work! The whole thing is mostly just passing serial data around, making an LED light up, and sleep statements :)
Yeah it’s an interesting project, but it looks bad with the printed case and exposed tact switches, and seems to have little functionality.