– The card is required to play Super CD-ROM² games (which are .cue/.bin or .chd) and allows CD-DA audio, memory manager, and Arcade Card emulation with additional firmware.

The primary function of the v3.0 card is to provide the necessary RAM buffer for complex CD-ROM titles (e.g., Snatcher , Legend of Heroes ).

If you meant something else by “prepare piece” — such as:

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