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Reverse Engineering the iPod Classic's Undocumented Mikey Chip

An engineer reverse engineered the undocumented Mikey chip (I2C address 0x72) in the iPod Classic that handles Apple wired earbud remote buttons, brute-forcing through all 256 mode register values to find that 0x2f enables button reporting. The chip has quirks — its event engine sleeps after ~5 seconds and reports button releases 1.8 seconds late. A Rockbox driver is now under review upstream, with a prebuilt image available for iPod Classic 6G/7G.

Background

The iPod Classic's inline remote chip (codename "Mikey") was never documented by Apple, leaving Rockbox users without support for earbud button controls for over a decade. Prior reverse engineering work on the chip existed only on a defunct blog, preserved via wiki mirror.

Source
Lobsters
Published
Sep 28, 2026 at 03:58 AM
Score
5.0 / 10