> Apple replacing the actual logic while maintaining the "API" of sorts is not unheard of. They did this with ADB, early PowerPC systems contained a controller

> Apple replacing the actual logic while maintaining the "API" of sorts is not unheard of. They did this with ADB, early PowerPC systems contained a controller chip that has the same API that was implemented in software in the 6502 IOP coprocessor in the IIfx/Q900/Q950.