TC Electronic Booster+
For my guitar, it was a Boss compressor, probably a CS-1, directly into a TC Electronic distortion pedal, into an MXR boost, into a Cry Baby Wah, then my chorus, the brand of which escapes me right now, and then into a volume pedal, all of which fed into a Mesa/Boogie Mark II head on a cab with, I think, a pair of JBL speakers. I was using one of my modified purple Rickenbackers when we recorded it.
I still have all my original pedals from the Purple Rain tour. The Boss Chorus, Boss Analog Delay and all my TC pedals from the mid-eighties.