User:Int 80h/files/DOS 6.22 autoexec.bat

autoexec.bat
DOS 6.22

I should explain the  variable is set to the SoundBlaster™ 16 emulation used in Oracle's VirtualBox™. When installing DOS 6.22 in there, and emulating that sound card, these settings are correct.

It should be noted, that VirtualBox doesn't emulate the MIDI interface, so there's no MIDI device at port 330h. It is set here (for good measure), but is actually superfluous.