The joystick port extender enabled an Atari ST owner to change joysticks without having to access the ports on the underside of the ST case.
Atari ST Joystick Port Extender Manuals:
Magazines RELATED to Atari ST Joystick Port Extender in our Library
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This exhibit has a reference ID of CH51139. Please quote this reference ID in any communication with the Centre for Computing History.
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