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Mainframe is a dork. He'd rather tackle complex mathematical problems than join the inconvenient galactic conflict with the Decepticons. Alas, his partner, Push-Button, would rather convert to a piston rifle than be stuck debugging Mainframe's programs.
- French name (Canada): Ordinateur
- Mainframe (Action Master, 1990)
- As an Action Master, Mainframe is a non-transforming action figure of a robot with an indeterminate alternate mode, but chances are he turns into one of those huge computers you see in those movies from the 70s and 80s, you know, the ones the size of refrigerators with the reel-to-reel magnetic tape. He is compatible with any Action Master vehicle or weapon. He was part of the second assortment of basic carded figures, and came with his partner-robot Push-Button.