I've patched a handful of protected-mode drivers and executables for RS-232 MIDI output that can be used with your serially-connected SC-55mkII. Here is the relevant post concerning DMX-based titles, such as Doom: https://www.vogons.org/viewtopic.php?p=976767#p976767 totally forgot to check this …

New to the forum and relatively new to DOS (been getting into it only this past year) I recently grabbed a Compaq 1130T laptop on the cheap and decided to make it my DOS machine. There's no sound card so I figured I'd use my SC55MKii to run midi out of the serial port when playing games like Doom. …