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Apple Desktop Bus Mouse
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== Common Modifications == === Two-Button Conversion === Most ADB controller chips included support for a second button, though Apple never implemented it. Common modifications included: * Identifying the unused second button pin on the controller chip (varies by manufacturer) * Adding a tactile switch connected to this pin and ground * Modifying the case to accommodate the additional button * Software support via third-party control panels (ClickChange, MouseWorks) === Optical Sensor Upgrade === Modern retrofit kits allow replacement of the mechanical ball system with optical tracking: * TT Design's ADB Optical Mouse Retro Board (RP2040-based) * Uses modern optical sensor (PixArt or similar) * Maintains original 100 CPI default with adjustable settings * Compatible with original ADB protocol and timing * Requires desoldering original PCB and installing retrofit board === Performance Enhancements === * '''Teflon pad replacement:''' Replace worn pads with PTFE dots * '''Ball upgrade:''' Replace with precision phenolic resin ball * '''Spring tension adjustment:''' Optimize encoder wheel pressure * '''Shielding improvements:''' Add EMI shielding to reduce interference
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