I'm creating a dosbox game using assembly 8086 as my programming language. I want to add some background music to the game. I'm using tasm/masm assembler.
How am I supposed to do that and what do I exactly need ?
I'm trying to play midi files while the game is running.
DOS doesn't have any abstractions for PCM or MIDI sound, so you need to program the hardware directly. How this is done depends on the hardware.
Here's a manual I found online about SoundBlaster cards: https://pdos.csail.mit.edu/6.828/2008/readings/hardware/SoundBlaster.pdf
And here is some information about AdLib cards: http://shipbrook.net/jeff/sb.html
There are many more resources you can find on Google with search terms such as "AdLib Programming", including YouTube tutorials.