**WIP!** The circuit has been successfully tested on a breadboard, firmware exists. Will update here with all source codes when it's fully working. This is my version of an USB SID adapter. - plug in a original MOS8580 SID chip - access it from the microcontroller - interface with USB The SID is directly connected to port B of the microcontroller, so one register write is sufficient. The DC boost can be enabled/disabled by software. The necessary clock of the SID comes from TIMER2. The firmware was quickly put together with STM32cube HAL, stick acts as a USB serial CDC, just open a serial connection and blast 2 byte packets (SID register number + data byte) - that's it. I also wrote simple hardsid.dll version that is doing exactly that - my prototype was used by C64 emulators like VICE.