The Off-Key Bard
History

This Day in History — ERMA Helps Bring Banking Into the Computer Age

On this day in 1959

On September 14, 1959, Bank of America accepted ERMA — the computer that processed 33,000 accounts per hour vs. a bookkeeper's 245, introduced by emcee Ronald Reagan.

The Off-Key Bard stands inside a rapidly growing bank facing a surprisingly modern problem: too much information. Millions of checks are moving through the system, and human clerks simply cannot process them quickly enough.

"The computer revolution wasn't only about calculating equations. Sometimes it was about figuring out how to make a machine read a check."

On this day in 1959, Bank of America formally accepted the first production ERMA — Electronic Recording Machine, Accounting — a computer system built by General Electric that automated the processing of checking accounts and permanently changed how banks handled money.

The numbers behind Bank of America's problem were stark. By 1950, the California bank was the largest in the state and led the world in check volume. An experienced bookkeeper could post 245 accounts in an hour — roughly 2,000 in a full workday, 10,000 in a week. Meanwhile, Bank of America's checking accounts were growing at 23,000 new accounts per month. Banks were being forced to close their doors at 2:00 PM just to finish the day's postings before midnight. The math was unsustainable, and it was getting worse every month.

In July 1950, Bank of America contracted the Stanford Research Institute to study whether automation could solve the problem. SRI spent years developing a prototype. The final prototype alone contained more than one million feet of wiring, 8,000 vacuum tubes, 34,000 diodes, five input consoles, two magnetic memory drums, 12 magnetic tape drives, and 24 racks of electrical packages. It weighed approximately 25 tons and required more than 80 kilowatts of power — plus its own dedicated air conditioning system.

When SRI was ready to announce the project to the public in September 1955, Bank of America arranged a press conference with considerable flair. The master of ceremonies was a personable television host and General Electric spokesman named Ronald Reagan.

The Engineering Problem: How Does a Machine Read a Check?

A computer could process numbers faster than any human alive. The problem was getting those numbers into the computer in the first place. A check is a physical piece of paper handled by many different hands, stamped, folded, written on, and shuffled through mail and banking systems. How do you design a number that a machine can reliably read no matter what the check has been through?

The answer was Magnetic Ink Character Recognition — MICR. Engineers developed a special typeface called E-13B and printed account numbers and routing information in ink containing iron oxide particles. When the check was passed through a magnetic field and then a reader, each character produced a distinctive electrical waveform that the machine could identify — even if the number had been stamped, marked, or partially obscured during normal handling. Human eyes can read the numbers too. Machines can read the magnetic patterns beneath them.

Bank of America freely shared MICR with the entire banking industry rather than keeping it proprietary. The American Banking Association adopted it as the national standard in 1956, ensuring that any bank in the country could use the technology without licensing fees. Those distinctive numbers still running along the bottom of every paper check today — routing number, account number, check number — are printed in E-13B in MICR ink, essentially unchanged from what engineers designed in the early 1950s.

GE Wins the Contract No One Expected It To Win

When SRI finished developing the prototype, Bank of America invited manufacturers to bid on producing the production units. Twenty-four companies expressed interest. General Electric won the $31 million contract — which was awkward, because GE didn't officially have a computer division. The same day the contract was signed, GE's president Ralph Cordiner reportedly sent a stern letter to the bid team stating: "Under no circumstances will the General Electric Company go into the business machine business."

The newly improvised GE computer department, headquartered in Phoenix, took SRI's tube-based prototype and converted it to a transistor-based design with core memory — significantly more reliable and compact than the vacuum tube prototype. They built a manufacturing facility, refined the design, and delivered the first system, passing acceptance tests on December 31, 1958. Bank of America spent the first part of 1959 working through operational procedures before formally accepting the system on September 14.

The results justified every bit of effort. In the same hour it took a human bookkeeper to post 245 accounts, ERMA posted 33,000. The system also flagged overdrafts automatically, printed statements, and handled stop-payment orders — tasks that had previously required human judgment on every transaction.

The Foundation for What Came Next

ERMA did more than process checks faster. By proving that computers could manage the everyday volume of consumer banking, it created the infrastructure for the next transformation. Bank of America had launched BankAmericard — the consumer credit card that would eventually become Visa — in September 1958, one year before ERMA's formal acceptance. Managing millions of revolving credit accounts required exactly the kind of automated account processing that ERMA made possible. The checking account system and the credit card system grew together, each requiring the computational backbone the other helped justify building.

ERMA served Bank of America until 1970. By then, the banking industry had moved well beyond it — toward networked systems, ATMs, and eventually the fully digital transaction infrastructure that processes billions of payments daily without a single piece of paper changing hands. But MICR and the E-13B font never went away. A technology designed for a 25-ton machine running on vacuum tubes is still printed on every paper check in America.

"The checks rolled in, the numbers grew,
Too much for hands alone to do.
So ink and circuits learned to speak —
And machines found numbers humans seek."

History reminds us: some of the most transformative innovations don't look like science fiction. Sometimes a revolution is simply a row of magnetic numbers printed along the bottom of a piece of paper — designed so carefully that both a human eye and a machine sensor can read them, and so well that they're still there 67 years later.

Sources

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