Editing TurboGrafx-16 (section)

===Super CD-ROM²===
[[File:Super CD-ROM2 with CoreGrafx II (3-4 right view).jpg|thumb|Super CD-ROM² attached to a CoreGrafx II]]
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 64 KB to 256 KB. 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. 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. PC Engine owners who did not already own the original CD-ROM² add-on could instead opt for the Super-CD-ROM² unit, an updated version of the add-on released on December 13, which combines the CD-ROM drive, interface unit and Super System Card into one device.