LC-3 assembly is an educational programming language. It is simple enough that complex programs can be written directly in it without needing a compiler, and thus it is often used in teaching assembly. An LC-3 textual assembly program is compiled to a binary object file by an assembler, and then executed by a virtual machine. Writing a virtual machine for LC-3 is a fun little exercise. However, in this post, we implement a disassembler for compiled LC-3 binaries back to textual assembly programs.