This major mode provides syntax highlighting for TIS-100 assembly. It conforms to the publicly released manual and does not include support for custom or classified extensions.
Note that BAK is not highlighted, as it is not useful in code.
Simply download tis-100-mode.el and load it into Emacs.
M-x tis-100-mode RET. You can also use a mode line, if you have the
storage space to spare:
# -*- mode: tis-100 -*-