Drum machine used from the very beginnings of SP on such songs as Armed to the Teeth (indeed, it was "the Pumpkins' first drummer", according to a tweet by the band on 2011/06/09, Ron Roesing notwithstanding), it was also used for the drum loops on 1979, and for many drum loops on Adore. Likely also used on electronic loop-heavy songs such as Isolation, Blissed and Gone, etc.
[info on Vintage Synth Explorer]