[grahamj]

heh my friend and I (young teens at the time) used to wire photoresistors into the analog in pins on the joy port. We put the sensors in toilet paper tubes on one side of a hallway with small lights across from them and wrote BASIC code that would turn on a light via the annunciator outputs when change was detected.

Then we’d see if we could sneak down the hall undetected, Mission Impossible style. I never noticed the detection speed varying with light level but I guess it did!