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HP used to have extremely small laptops in the early 90s, specifically the omnibook 300

The HP LX series (95LX, 100LX, 200LX) is one of my favorites. It also fits the description "smaller than VHS casette"

don't forget the Jornadas. i guess those were PocketPC-powered but i def bought one circa 2005 for like $90 and i would do it again right now