TXT file

Three text files (excluding the IPL file) are necessary for the CD to be recognized.


 * CPY.TXT: "Copyright by SNK corporation", 0x1A
 * BIB.TXT: "Bibliographiced by SNK corporation", 0x1A
 * ABS.TXT: "Abstracted by SNK corporation", 0x1A

Those exact strings can be found in the CD1 System ROM dump (FRONT-SP1) @$F5A8.