Prince was known for his use of Boss pedals. From the 1999 tour onward, he always used a pedalboard containing multiple Boss pedals. He also used these pedals in the studio for processing, guitar, bass, keyboard and drum sounds. His distinctive drum sound that appears on records like 1999, Purple Rain, Sign O The Times and Rave Un2 The Joy Fantastic came from processing his Linn LM-1 with Boss effects. His Boss pedalboards for live use are documented from the 1999 tour onward.
This page summarises Prince's Boss pedals for each era. There are reports of him using other pedals in the studio that weren't used live. Prince was reported to have multiple pedalboards, so it is likely there may have been some variations to these boards.
1982-1985 - (1999, Purple Rain, Around The World In A Day)
The analogue DM-2 Delay was replaced with the newer, digital DSD-2 Digital Delay/Sampler. Prince may have also used the similar DD-3 Digital Delay. There are reports from Prince's engineers of Prince using other Boss pedals in the studio, especially for use with his Linn LM-1.