in 1992 and was similarly offered built-in with the Turbo Duo (the U.S.
Games that required this BIOS, which are labelled Super CD-ROM² discs, will display an incompatibility notice when loaded on a prior System Card. Version 3.0 increases the amount of buffer RAM from 64kB to 256kB, hence the addition of the word Super. The later models of the Duo (Duo-R and Duo-RX) also have this BIOS built-in. It was initially available built-in with the PC Engine Duo, a model of the console with an integrated CD drive, but was quickly offered as an upgrade to owners of the original CD-ROM² System in the form of the Super System Card, and later as an updated model of the add-on itself known as the Super CD-ROM² unit. The Version 3.0 BIOS was launched in Japan in 1991. Its only new feature was its ability to auto-detect disc changes. System Card Version 2.1, released in 1990 exclusively in Japan, was the first System Card that was sold as a stand-alone, intended to be a replacement for users who had their original System Cards lost or damaged. This can also be seen in most, if not all, games for the TurboGrafx-CD. For example, it can be found at 0x3FAE0 in US System Card v.
Inside all of the system cards is the following message.
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