The computing industry started booming after World War II. General Electric’s CEO refused to enter that market. But a small team of rebel employees bent the rules to forge on in secret. They created the GE 225. It was a giant leap in engineering that pushed computing from a niche market to the mainstream—sowing the seeds for today’s tech industry.

Before the creation of general-purpose mainframes, computers were often built to perform a single function. William Ocasio recalls how GE’s first specialized computers, the ERMA, helped banks process thousands of transactions per day. John Joseph recounts how a few key GE employees hoodwinked their CEO into creating a computing department. Tomas Kellner explains how their work resulted in a revolutionary machine—the GE 225. And Joy Lisi Rankin describes how engineers at Dartmouth College adapted the GE 225 for time-sharing and used it to create BASIC—major milestones in making computing more accessible.

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