Rise your hand if you remember how long you had to tinker around to get enough EMS to load the game plus sound card drivers loaded into memory when being in DOS!
Wait play the game? I am fiddling my config.sys and autoexec.bat just right and making sure I could get to 610k. Using 4DOS to have a pick a path adventure of which configuration to load as it was starting up to run each game. Then I might play a game here and there.
I definitely remember the collection of boot disks I used to load the right autoexec.bat/config.sys settings for the Ultima and Wing Commander games, and how long I spent tuning these settings. I was just a kid then, but I remember the whole exercise being pretty complicated!
I remember getting "The Complete Ultima VII" on CD and never figuring out how to get it running. I think I've still got the box, but I think the disc has been missing for years. I bought it on GOG some time ago, though.
Other than Ultima 7 I only know of Zone66 as another game that used Unreal mode. Early versions also didn't like v86 mode but later versions added support for DPMI or in some other way started to play nicely with EMM386
:-D