The CD-ROM
System Card based games require a special kind of CD-ROM. The first track of one of those CD-ROMs is an audio track, containing a warning, that the CD-ROM can not be played in a normal CD-player. 

The second track contains the game and it's data. The following tracks can contain audio-data or additional data. 

Every sector is 2048 bytes. The first sector contains some information, that has not yet been identified. This is the boot-sector (#2): 

Games, that are based on the "Games Engine" system card use a standard ISO-9660 file-system. 

00 IPLBLK H load start record no. of CD  
01 IPLBLK M load start record no. of CD  
02 IPLBLK L load start record no. of CD  
03 IPLBLN load block length of CD  
04 IPLSTA L program load address L  
05 IPLSTA H program load address H  
06 IPLJMP L program execute address L  
07 IPLJMP H program execute address H  
08 IPLMPR2 ipl set mpr2 (+ max mapping)  
09 IPLMPR3 ipl set mpr3 (+ max mapping)  
10 IPLMPR4 ipl set mpr4 (+ max mapping)  
11 IPLMPR5 ipl set mpr5 (+ max mapping)  
12 IPLMPR6 ipl set mpr6 (+ max mapping)  
13 OPENMODE opening mode 
[bit 0] data read to VRAM 
0:not read 
1:read 
[bit 1] data read to adpcm buffer 
0:not read 
1:read 
[bit 5] bg display 
0:disp on 
1:disp off 
[bit 6] adpcm play 
0:play 
1:not play 
[bit 7] adpcm play mode 
0:single 
1:repeat  
14 GRPBLK H opening graphic data record no.  
15 GRPBLK M opening graphic data record no.  
16 GRPBLK L opening graphic data record no.  
17 GRPBLN opening graphic data length  
18 GRPADR L opening graphic data read address L  
19 GRPADR H opening graphic data read address H  
20 ADPBLK H opening ADPCM data record no.  
21 ADPBLK M opening ADPCM data record no.  
22 ADPBLK L opening ADPCM data record no.  
23 ADPBLN opening ADPCM data length  
24 ADPRATE opening ADPCM sampling rate  
25  (reserved)  
26  (reserved)  
27  (reserved)  
28  (reserved)  
29  (reserved)  
30  (reserved)  
31  (reserved)  
32-  "PC Engine CD-ROM SYSTEM", 0, "Copyright HUDSON SOFT / NEC Home Electronics,Ltd.", 0  
  Program name, 16 bytes  
  reserved, 6 bytes