Reverse Engineering The Philips PM5139

A hobbyist reverse engineered the Philips PM5139 function generator, a poorly documented piece of test equipment from the early 1990s whose only available service manual belonged to a lesser sister model. Starting from two EPROM dumps, the firmware was studied and modified using an 8051 emulator to observe execution behavior. The resulting custom 'V2.0' firmware adds six arbitrary waveforms and the ability to play simple music, among other enhancements to the original hardware.

Source: https://hackaday.com/2026/09/09/reverse-engineering-the-philips-pm5139. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.