Restoring an RXV21 and/or an RX02

In my quest for a working RX02 I'm trying to find out the best way of checking out an RXV21 and get it talking to the RX02. I have most of the standard diagnostics including XXDP. The setup is an 11/83 with an RX50 and RD53. (I can boot from either) In the box is MSV11-J PMI KDF11-B RXV21 RQDX3 They are in the order as above. The two dual height modules are in the right hand side of the back plane when viewed from the front. I am unsure as if there is a utility for RXV21 among all the diags I have or should I go in with ODT on a halted system and look at registers. With the setup above I need to get the RXV21 going in order to check out the RX02. The precise syntax of any commands is important because presuming I may have prior knowledge is not a good idea. I may have known this stuff in the past but I cant remember if I did or not!! Rod