Keeping SC64 firmware up to date is highly recommended. `sc64` executable is tightly coupled with specific firmware versions and will error out when it detects unsupported firmware version.
SC64 holds some internal configuration options after `sc64` executable finished running. To reset it simply run: `./sc64 --reset-state`. Internal flashcart state can be checked by running: `./sc64 --print-state`
Replace `path_to_rom.n64` / `eeprom-4k` / `path_to_save.sav` with appropriate values for desired game. Script will try to autodetect used save type so explicitly setting save type usually isn't needed. Check included help in program to list available save types.
64DD games require DDIPL ROM and disk images. To run disk game type `./sc64 --boot ddipl --ddipl path_to_ddipl.n64 --disk path_to_disk_1.ndd --disk path_to_disk_2.ndd`.
Replace `path_to_ddipl.n64` / `path_to_disk_x.ndd` with appropriate values. Argument `--disk` can be specified multiple times. Only `.ndd` disk format is supported currently. To change inserted disk press button on the back of SC64 flashcart. Make sure retail and development disks aren't mixed together. 64DD IPL can handle only one drive type at a time.
Run `./sc64 --boot direct-rom --rom path_to_rom.n64` to disable bootloader during boot and console reset. This option is useful only for very specific cases (e.g. testing custom IPL3 or running SC64 on top of GameShark).