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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..