I found a different kernal/basic rom at the U32 location in my C128. It is labeled "1988 SEW 128 PLUS". It has a wire going to the bottom of the keyboard. The alt-key seems to toggle fast mode and the function keys have new functions like @$, load, save, list, run, sys48979 and sys62368. Does anyone know what this is?
I run Linux Mint. I installed it with apt-get/package manager and placed the ROMs in ~/.vice/C64/ (basic, kernal, chargen, d1541II for example) or ~/.vice/C128/ for 128 ROMs. If ROMs are missing you will get a message about that if you start it from command line.