How to keep a toddler entertained, 80s style: boot your #MSX to the Basic interpreter, let the kid play entering letters. Just that. Endless amusement. There's nothing that can be “broken” that won't get solved by turning it off and on again.
@aperezdc yeah, #BeardGrabber enjoyed just typing in letters while he was 2-3 years old (and I guess still now at age of 4, but he hasn't shown much interest lately).
Though I at the time wrote a little Python app that would capture all the keypresses, so I could suppress keyboard combinations that could close the app or bring him to another app. Setting up the #MSX certainly would've been more foolproof I guess, especially with the #NMS8250's separate keyboard. Just didn't really have the space to keep that machine set up permanently.