Parametron arcives-Computer Museum
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From the archives: 【upper left】 The first program for PC-1 to check the operation. It was hand-assembled to the machine code at the site. 【lower left】 US patents of parametron (left and middle); von Neumann's patent which resembled parametron (right), however later parametron patents were granted as an independent invention. 【right】 The program list of R0 initial order (the input routine for PC-1). It implemented the symbolic assembler and the loader functions only using 68 words.
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