version of this BIOS, NEC went through the bare minimum effort of localizing it by simply removing the "PC Engine" from the title screen. version of the PC Engine Duo) or as an upgrade for the TurboGrafx-16/CD in the form of the Super System Card (which was available primarily as a mail order). 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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