The Neo Geo CDZ was just a modified version of the
Neo Geo CD; it was only released in Japan. It had a 2X CD-ROM drive instead of the 1X one that you'll find on the Neo Geo CD. It was overpriced (at $600) since it didn't have too much more then the regular Neo Geo CD. The CDZ also had some issues with overheating during its short life span.
Specs:
CPU: 68,000 (16 bit)
CPU Speed: 14 MHz
Colors On Screen: 4,096
Colors Available: 65,536
Resolution: 320 x 224
Max Sprites: 380
Max Sprite Size: 16 x 512
Number of Planes: 3
Work RAM: 64 kbit
Video RAM: 68 kbit
Z80 RAM: 2 kbit
CD Sound Chip: 13 Channel Yamaha 2610 Chip
CD-ROM access speed: 2X
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