Apollo Guidance Computer
On a slight tangent from this topic, the source code for the Apollo computer has been uploaded to Github.
# "IT WILL BE PROVED TO THY FACE THAT THOU HAST MEN ABOUT THEE THAT
# USUALLY TALK OF A NOUN AND A VERB, AND SUCH ABOMINABLE WORDS AS NO
# CHRISTIAN EAR CAN ENDURE TO HEAR."
The Apollo display and keyboard used two digit verb and noun codes for user input.