I finally got round to tinkering with my NCR DMV's ... the bad news is, that both colour machines appear to be dead. The good news is that I was able to cobble together a working machine that accepts all four operating systems: CP/M-80, CP/M-86, MS-DOS and CP/M-68K
I've scanned two further manuals and combined them with a publicly available one, so in this archive NCR DMV System Technical Manuals
you can find three of the four System Technical manuals (for Hardware, CP/M-80 and CP/M-86). Apart from Hardware descriptions, there's also programming info and commented BIOS disassemblies/listings.