Game CD structure

It seems that the NeoGeo CD wants at least a PRG, FIX, SPR, Z80 and PCM loaded in IPL.TXT, or else it will simply reset after loading.

Recognized files

From table in System ROM dumps:

• IPL file (no type)
• PRG files (type 0)
• FIX files (type 1)
• SPR files (type 2)
• Z80 files (type 3)
• PCM files (type 4)
• PAT files (type 5)
• TXT files (no type)
• OBJ files (type 7)
• A** files, (type 8) ?
• SYS files (type ?)
• others ?