@Clem Cole , I don't remember what it was. But, the XT had an 8088, so certainly no 386 technology was involved. Marc On Wed, Mar 13, 2024 at 8:38 AM Clem Cole wrote: > @Marc > > On Tue, Mar 12, 2024 at 1:18 PM Marc Rochkind wrote: > >> At a trade show, I bought a utility that allowed me to run PC-DOS under >> PC/IX. I'm sure it wasn't a virtual machine. Rather, it just swapped back >> and forth. (Guessing a bit there.) >> > Hmm ... you sure it was not either VPIX or DOS/Merge -- ISC built VPIX in > cooperation with the Phoenix Tech folks for PC/IX. I always bought a copy > with it, but it may have been an option. LCC did DOS/Merge originally as > part of the AIX work for IBM and would become a core part of OS/2 Warp > IIRC. Both Merge and VPIX had some rough edges but certainly worked fine > for DOS 3.3 programs. The issue tended to be Win and DOS graphics-based > programs/games that played fast and loose, bypassing the DOS OS interface > and accessing the HW directly. For instance, I never got the flight > simulator (Air War over Germany) for Dad's WWII plane (P-47 Thunderbolt) to > run under either (i.e., only under DOS directly on the HW. FWIW: In that > mode, Dad said the simulator flew a lot like how he remembered it). > > Both Merge and VPIX used the 386 VM support and a bunch of work in the > core OS. Heinz would have to fill us in here. The version of the 386 > port ISC delivered to AT&T and Intel only had the kernel changes to allow > the VM support for VPIX to be linked in, but it was not there. IICR (and > I'm not sure I am) is that Merge could run on PC/IX also, but you had to > replace a couple of kernel modules. It certainly would work on the AT&T > and Intel versions. > ᐧ > -- *My new email address is mrochkind@gmail.com *