And to extend that a bit for the OP also read: https://en.wikipedia.org/wiki/Computer_programming_in_the_punched_card_era https://en.wikipedia.org/wiki/Computer

And to extend that a bit for the OP also read: https://en.wikipedia.org/wiki/Computer_programming_in_the_punched_card_era https://en.wikipedia.org/wiki/Computer_programming_in_the_pu... and https://en.wikipedia.org/wiki/Punched_tape https://en.wikipedia.org/wiki/Punched_tape and similar literature for the "interface" with a computer. No "terminal" required :)