> banks that are used to working with them for 30 years Given that banks were among the earliest commercial customers of computing machinery, it's more like 70

> banks that are used to working with them for 30 years Given that banks were among the earliest commercial customers of computing machinery, it's more like 70 years: https://www.ibm.com/ibm/history/ibm100/us/en/icons/bankauto/#:~:text=At%20the%20heart%20of%20these,the%20first%20compatible%20computer%20series https://www.ibm.com/ibm/history/ibm100/us/en/icons/bankauto/....