The IBM Series/1 reference article from the English Wikipedia on 24-Jul-2004
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IBM Series/1

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The IBM Series/1 computer was a miniature mainframe that used Event Driven Language (EDL) to control and operate external electro-mechanical components while also allowing for primitive data storage and handling. A "technologically advanced" Series/1 operated at 50-100 MHz with 1 Megabyte of memory.