American Type Founders designed the OCR-A font in 1968 in order to aid machines in recognizing the characters optically long before advanced OCR technologies were available. The goal was to be both machine and human readable and it was a great success and is still used today in a variety of places despite being followed by the more human friendly OCR-B.
I created this liberal adaptation on the Sinclair Spectrum +3 using Artist II some time in the late 1980s. The strong distinctive style shines through even at this tiny size.
This font works well if you want a dated view of the technological progress.