in 1992 and was similarly offered built-in with the Turbo Duo (the U.S. 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). version of this BIOS, NEC went through the bare minimum effort of localizing it by simply removing the "PC Engine" from the title screen. This was due to distribution of TurboGrafx-16 software and hardware shifting from NEC's U.S. (a joint venture between NEC and Hudson Soft), who opted to abandon the TurboGrafx-CD branding for the CD games in favor of keeping the CD-ROM² and Super CD-ROM² branding used in Japan. The Arcade Cards, released in 1994, were the final set of upgrades to the PC Engine CD-ROM² System and came in two variants. The Arcade Card Duo, designed for PC Engine consoles equipped with the Super CD-ROM², adds 16-Megabits of D-RAM on top of the 256kB of buffer RAM within the hardware. Unlike previous System Cards, the change was purely on a hardware level and there was no BIOS update this time, keeping it strictly on Version 3.0.
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