Go to support/fonts and add the ModernDOS4378x8.ttf font to your fontbook (i.e. install the font on mac os). You need to have iTerm2 installed and then:
ln -s $(pwd)/support/iterm/term6502-profiles.json ~/Library/Application\ Support/iTerm2/DynamicProfiles/
bundle install
gem build term6502.gemspec
gem install term6502-0.1.0.gem
term6502 -h