SCO was not blind to the advantages of having single-binaries across the product line when possible, so most XENIX-386 utilities et al were compiled segmented-286. The easiest way to check is as follows, if you have a Linux machine. -build a kernel with SYSTEM V/XENIX/Coherent FS available as a module or built-it -mount the N1 disk (standard SysV FS, bootable), or the image therof -"file xenix" to see the kernel type. 386 kernels will have '386' in the output of the file command. beware -- XENIX tends to be very hardware specific, and at least some of the Wyse distros were linked to Wyse HW. You may or may not be able to get it to install. The 2.3 series seems to be more forgiving than the 2.2 series, though. Remember that you will need a serial/activation code to get it installed and to get the devel environment working. Does anyone here know how the XENIX 'brand' setup works? it somehow modifies the binaries, but I don't have the devel environment or a disassembler so I don't know how.