To use either of the CD-ROM² systems, a TG16 or PC Engine needed special HuCards to boot the CDs. These were known as System Cards. Three versions--1.0, 2.0 and 2.1--were originally released, as well as a 3.0 Super System Card that supported Super CD-ROM² games.

The Arcade Card was a Japan-only product that upgraded the PC Engine CD-ROM² format once more. Arcade Card games were bigger, better, prettier, etc. Two versions of the Arcade Card were commercially released: the PRO version, for CD-ROM² systems, and the DUO version, only used to upgrade Duo systems.

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