This was followed by the Super System Card, released on October 26, an upgrade for the existing CD-ROM² add-on that serves as a replacement to the original System Card. This upgrade was released in several forms: the first was the PC Engine Duo on September 21, a new model of the console with a CD-ROM drive and upgraded BIOS/RAM already built into the system. In 1991, NEC introduced an upgraded version of the CD-ROM² System known as the Super CD-ROM², which updates the BIOS to Version 3.0 and increases buffer RAM from 64kB to 256kB. 2 TwinBee games available on the system.
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