I never interacted with systems older than a 286 but I'm actually curios about them. Maybe you could "lease" these computer, by virtualizing the keyboard input

I never interacted with systems older than a 286 but I'm actually curios about them. Maybe you could "lease" these computer, by virtualizing the keyboard input and stream the screen back via a simple webcam, some curios and universities could rent them for education purposes. Still I can't see any decent revenue, let alone driving a business.