A:AnswerHi MJ, Yes, it supports DVDs (Region 1). You may refer to page 30 of this link for more information:
https://www.sony.com/electronics/support/res/manuals/4687/46873091M.pdf
~Ralph
A:AnswerHi BarryManlow, If you are going to connect this device to a TV, an HDMI cable is needed. You may refer to page 11 of this link:
https://www.sony.com/electronics/support/res/manuals/4687/46873091M.pdf
~Ralph
A:AnswerCan some provide FIRST HAND experience to confim that the Sony - UBP-UX80 DOES play SACD and DVD Audio 5.1 via HDMI (to 5.1 receiver with HDMI)?
A:AnswerYou can also play regular Blu-Ray DVDs. But you will not be able to view a 4K Ultra Blu-Ray DVD. Most Ultra 4K Blu-Ray DVD includes a regular Blu-Ray DVD.
A:Answerthis looks like the first gen 800x from 2018 and if that's the case then no there's no Dolby Vision offered on this. The x800m2 does offer Dolby Vision.