Which Operating System for my DCC-116 E / Entrex 480 / Nixdorf 620 / Data General Nova 1200 clone ?

Hi all I start here another topic concerning my research about a new Operating System for my freshly restored DCC-116 E. http://www.zeltrax.com/classiccmp_forum/second_boot/04.jpg http://www.zeltrax.com/classiccmp_forum/second_boot/02.jpg I originally intended to install RDOS on my machine but it seems very difficult to find the files needed to make a system installation tape. I do not know well the subject yet, I don't found clear information about the compatibility of my clone with the original RDOS from Data General. Thus, before trying the impossible, I would like to know if another OS are available for my machine ? I would like to be able to do basic things like : - Be able to manage my devices, copy files from tape to disk or vice versa. - Be able to list directories, create subdirectories. - Write and read text files that I could send on my drum printer. - Have some communication software, tty, rs-232 (for the day I find a comm board). - Some diagnostic tools to check core memory, disk, tapes. - Being able to write in a simple programming language such as BASIC would be great. - Be able to use simultaneously more than one Entrex terminal. - Maybe a database software ... ? Of course I am also interested in anything that goes beyond that. I also have more bizarre projects with this machine like generating algorithms to trace small animations on an analog oscilloscope and ... well, another chapter ;-) To recap, here the specifications of my system: Computer : D-116, clone of a DG Nova 1230 with 17 slots, also known as "Entrex 480" and "Nixdorf 620" Core memory : 64 kW Terminal : ENTREX DATA/SCOPE Disk Cartridge : Diablo Model 40 Mag-tape : Pertec 8840A (800 bpi) Line drum printer : Data Products model 2230 As the machine was distributed by Nixdorf, the identification of the tape and disk controllers is a bit difficult, but I can take detailed pictures. Thanks a lot for your help ! Dominique