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C16 in C64 case with proper joysticks (Commodore TED Developer Alpha) – Retro Hardware
ADVANCED COMMODORE C16 / PLUS 4 / TO C64 / AMIGA JOYSTICK CONVERTER ADAPTER | eBay
Complete list of Basic V3.5 commands of the Commodore 16, 116 and Plus/4 - Amedeo Valoroso
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For Chris – Commodore Pi Joystick setup. | StiGGy's Blog
WheelOfJoyMini - Commodore 16/116/+4 4-Player Joystick Adapter With 2-Button Support - Share Project - PCBWay