A description of the concept, capabilities, hardware, software, language, and usage of JOSS, an on-line time-shared interactive plug-in computing system. JOSS was designed for casual use by problem-solvers rather than for system programmers. The interactive method of thinking at the console is estimated as being ten times faster than the usual problem-inception-to-problem-solution approach to a computer. jEvery 24 hours, about 3 million JOSS statements are now processed in an average 5.5 milliseconds. Average computation per session is 20,000 statements, leaving enough unused capacity to accommodate 100 consoles or more. Complete hardware description, flow charts, and sample programs are given. (Presented at the Fall Symposium of the Digital Equipment Computer Users Society, November 1966.)
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