This is the first version of the now famous all digital console from Yamaha.
It has been very well used, the cursor keys work but have been damaged and are missing parts plus a button has been attached to allow the use of one key. There are also some non standard replacement control knobs
On the plus side there is an addition AES/EBU expansion i/o board fitted as pictured
This desk also features multiple on-board SPX digital effects units.
Lots and lots of features available so please read the full user manual on this link > YAMAHA 02R
Here's a chap describing a similar 02R on YouTube