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The PC Engine Super CD Card is an upgrade card for the PC Engine CD that adds 1 Megabyte of RAM and updates the system bios. The card was later updated to add 1.5 Megabytes of RAM.
The PC Engine combined with the CD-ROM² and Super CD Card add-ons is known as the PC Engine Super CD-ROM². A combined version was released as the PC Engine Duo in 1991 (in Japan) and as the Turbo Duo in 1992 (in the United States).