1. there's no "default cIOS"
2. Gamecube is not controlled by cIOS, but by MIOS.
You probably installed DIOS MIOS, or DIOS MIOS Lite, or cMIOS, which alter and change the way Gamecube mode is working.
If you installed cMIOS, it can now read gamecube burned backup discs using Gamecube Backup Launcher by Wiigator
If you installed DIOS MIOS, you need to have a FAT32 HDD connected to your Wii to be able to play retail disc games, or install the official MIOS back.
If you installed DIOS MIOS Lite, you need to have a FAT32 HDD connected to your Wii to be able to play retail disc games, or install the official MIOS back.
3. default system files:
I guess you want to know what's good or bad.
- Do not touch, install, patch anything bellow slot 200. It's the place where nintendo install its own IOS, and they are required for the wii to function correctly.
- If you installed or touched anything below 200, let us know, don't touch anything without telling us first.
- Above slot 200, it's the place where patched IOS are located (commonly called cIOS, custom IOS)
commonly used (not default, but common) cIOS are:
202 : used to allow DVD access in old homebrew (DVDX), and that's probably the one you want to play Playstation games using wiiSX. There are different IOS202 version.
- 202 by Hermes (you can select different base for this slot, base 60 is often recommended).
- 202 by Rodries (this is the latest version, and WiiSX has a special modded version which require this version).
But Official WiiSX doesn't require slot 202 at all! it works with official IOS 58.
220-224 : Hermes cIOS. Old cIOS used by Hermes uLoader program. It can also be used by modern USBLoaders, but it's not useful anymore.
240-253: usual range for currently used cIOS (d2x cIOS). Most common slots are 249 and 250.
254: Don't touch this one ! this is Bootmii program installed as IOS.
There's an easy way to determine what you currently have installed on your Wii : follow the syscheck guide linked in my signature and post the result in this thread.