Maybe additionally disabling ems works (since memory is accessible through the int15 interface then, maybe the game is checking for it that way). Sorry, my mistake. The game was not complaining about not having sufficient memory, it said "XMS driver not detected". I tried disabling both XMS and EMS …

If you disable XMS, the result will be the game complaining about not having sufficient memory and automatically disabling sounds (at least SoundBlaster ones). The solutions I found (on DOSBox 0.73, DBGL 0.67, using SounBlaster 16) to avoid disabling XMS: - be sure the game sound settings (setup by …