Porting DOS assembly to the browser

My tic-tac-toe game is written in 16-bit x86 real mode assembly. There is no compiler that turns that into WebAssembly — the instruction set, the segmented memory model and the DOS interrupts have no equivalent target.

So the plan is emulation: assemble the original source with NASM, link it into a DOS executable, and run that executable inside DOSBox compiled to WebAssembly. The WebAssembly here is the emulator, not my code, and I think that honesty matters more than the label.

The build already works: nasm -f obj assembles both source files without a single change, and Open Watcom’s linker produces a 3,244 byte DOS executable.