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• The Dark City Productions Duo Pages - Information about the PC Engine-Turbo Grafx 16, a Valis homepage, and the Error Archive (screens displayed without a Super System^3 card).
• Duo Planet Italy - Italian website for Duo gamers worldwide. Games exchange, guestbook, and Duo links.
• Jadeite's Turbo Grafx+16 Page - Dedicated to the Turbo Grafx+16, Turbo Duo.
• PC Engine DE - Information, tips, games, hardware, and software.
• PC Enginefx.com - Information and images of the NEC PC+FX covering the PC Engine, Playdia, Dreamcast, J+POP, and NeoGeo Pocket.
• PC Engine.net - Excellent resource for PC Engine related information, including screenshots, reviews, and console information.
• Turbo Grafx Addict - Provides cover scans of both Japanese and United States release games.