region free and HD-SDI options:

-Region free mod will apply to both DVD and Blu-Ray and is a manual switch that uses the remote while the player is powered down
-HD-SDI is the highest end video signal output possible today, direct digital decoder output with no HDCP, HD-SDI supports 480i, 720p, 1080i and 1080p/24, the Oppo 83 HD-SDI will also have support for 720p/50, 1080i/50 and 576i modes as well, which covers all Blu-Ray and DVD media from anywhere in the world

thanks

-Gary Murrell
http://www.custom-ht.com/oppopowerbuy.html
My Personal HT setup