Here I am! RSX-11M V4.2 BL38B
I have two RX50 disk units and Kermit. 512kb and one RD51 fixed disk. I planned to archive separately every [*,*] and image the disks. I tried and can write back and read RX50 disks with a properly setup PC. I need only RSX-11M installation disks images but I'm confident they can be found somewhere on the net. I'll give a look to BRU... Thanks!