Reverse-engineering and emulating the Fisher-Price Pixter, two decades later

Dmitry Grinberg documents a complete teardown, reverse-engineering, and emulation of every Fisher-Price Pixter variant — the monochrome 2000 original, Pixter Plus, Pixter 2.0, Pixter Color (2003), Pixter Multimedia (2005), and Pixter Pocket — along with nearly all known cartridges. Until now, the platform had no working emulator and only fragmentary public documentation; online sources actively warned that any claimed Pixter emulator was a scam.

The work started as a side effect of porting PalmOS to the Pixter Color, whose Sharp LH75411 SoC in an LQFP package made pin-level probing feasible. From there, Grinberg dumped ROMs and cartridges, decoded two distinct proprietary bytecode VMs (one per device generation), identified the melody coprocessors, mapped the BEX bus and weird cartridge pinouts, reconstructed cartridge header and image-compression formats, and built emulators (uPixter, uARMpixter, uM23) plus disassemblers for both VM families. Hardware quirks like resistive touch panels wired on the cheap, paged memory, and chip-on-board dies that resist decapping all had to be worked around.

The result is a full historical preservation: device internals, instruction sets, cart formats, and playable ROMs for a children’s toy line that sold hundreds of thousands of units but was on track to vanish entirely. The appendices read as the missing datasheet Fisher-Price never published.