Worked in IT in the mid-90s, was a great time and I became a sought after "expert" to free conventional memory for lab PCs connected to equipment. Did it all b

Worked in IT in the mid-90s, was a great time and I became a sought after "expert" to free conventional memory for lab PCs connected to equipment. Did it all by hand at first with mem.exe and edit.com?, but I think in 6.0 I started also using a TUI to visualize the upper area—the helpful msd.exe: https://i.postimg.cc/2jX8LpF0/memorymap.png https://i.postimg.cc/2jX8LpF0/memorymap.png More recently in the XP era, I used the DOS multi-config menu in a classroom environment. Combined with ghost the partition imager. There was a menu that defaulted quickly to booting the current OS partition. But hit the right key at boot and you could restore the computer from a pristine pre-configured XP image. Since the images were on a primary partition it would be hidden from the end-user and not mounted for them to prevent issues. You could also update the current image and save it back to the menu partition for next time. This happened once in a while to apply windows/app updates. Worked incredibly well, until the whole classroom was dismantled around 2015ish.