Commodore 64 in Psych - Season 4, Episode 7, "High Top Fade Out" (2009)

A scene at the beginning of the episode shows Shawn, as a child with his father, in a store in 1989. He plays with a Commodore 64 whilst asking his Dad for a computer, but is given a detective kit instead.

Only a fleeting glimpse of the corner of the keyboard here.