@Bailey69, On your remote look down to the left side of it, there is a button it says 'info' push it and it will show you on the display of your unit, DSP Program, Audio Decoder, and Input. Yamaha goes about displaying a little different than the rest of the manufacturers. Took me a lil while to get use to it. Now if your unit is hooked up by HDMI, On your remote next to the cursor buttons middle ways to the right side of your remote hit the 'Display' button OSD will pop up it will show what your unit is running in, surround format, TrueHD, Atmos..ect..
@Bailey69, how are you liking your A870?