I remember HERO from my university robotics club, some 10 years ago. Punching in hex codes for machine instructions was so fun, especially since that encouraged

I remember HERO from my university robotics club, some 10 years ago. Punching in hex codes for machine instructions was so fun, especially since that encouraged us to drop the computers and code on paper. Nevertheless, someone made an assembler, figured out the code upload interface and future instructions were uploaded using a mini jack and a sound card.