The IBM System/3 (introduced 1969 discontinued 1985) was a low-end business computer aimed at new customers and organizations that still used IBM 1400 series computers or unit record equipment. It was the first member of what IBM refers to as their "mid range" line and introduced the RPG II programming language for which it was essentially an appliance for small business applications.
Read more about IBM System/3: Overview, Instruction Set, Computer System, Legacy, Quirks, Chronology
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“Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates.”
—G.C. (Georg Christoph)