First ATMs performed tasks like a cash dispenser, they were offline machines which worked with punch cards impregnated with Carbon and a 6-digit PIN code.

Maximum withdrawal with a card was 10 pounds and each one was a one-time use card - ATM swallowed cards!

The first ATM was installed in London in the year 1967, as I looked at time line of programming languages, there were many programming languages made before that decade. I don't know about the hardware neither, but in which programming language it was written?

*I didn't find a detailed biography of John Shepherd-Barron (ATM inventor at 70s)

Update

I found this picture, which is taken from a newspaper back to the year 1972 in Iran.

Translated PS :

Shows Mr. Rad-lon (if spelled correctly), The manager of Barros (if spelled correctly) International Educational Institute in United Kingdom at the right, and Mr. Jim Sutherland - Expert of Computer Kiosks.

In the rest of the text I found on this paper, these kind of ATMs which called "Automated Computer Kiosk" were advertised with this:

Mr. Rad-lon (if spelled correctly) puts his card to one specific location of Automated Computer Kiosk and after 10 seconds he withdraws his cash.

Two more questions are:

1- How those ATMs were so fast? (withdrawal in 10 seconds in that year)

2- I didn't find any text on Internet which state about "Automated Computer Kiosk", Is it valid or were they being called Computer in that time?