Tootfinder

I'm reading a piece of code which is certainly BASED ON code I wrote in 1986, which is so terrible, that, even though I know exactly what it does, I cannot understand it.
And although I know this is not exactly my code, I'm pretty certain that my code must have been pretty much as bad as this!
#Lisp #Shamed

OK, a sidequest on the #tricycle project: I'm going to have to do data capture, storage and display. I need to log speed, cadence, battery voltage, and some indicator of power consumption. I need to display at least speed, cadence, and projected range. I can do speed and cadence off hall effect sensors. I want to use #Lisp