The SD2IEC has completely new hardware and firmware, different from any old CBM drive. With patched ROMs and IEC device settings you can choose an emulated enviroment similar to a real SD2IEC.
In the VICE emulator you can mimic a SD2IEC's FAT formatted card with filesystem and IEC device settings, a modified Kernal and a DOS for CMD drives.
Back to the C64/SD2IEC page.