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- Q5275699 subject Q10248435.
- Q5275699 subject Q8408267.
- Q5275699 abstract "The Digi-Comp II was a toy computer invented by John Thomas Godfrey and manufactured by E.S.R., Inc. that used marbles rolling down a ramp to perform basic calculations. A two-level masonite platform with guides served as the medium for a supply of marbles that rolled down an inclined plane moving plastic cams as they went. The plastic cams played the part of flip-flops in an electronic computer - as a marble passed one of the cams, it would flip the cam around - in one position, the cam would allow the marble to pass in one direction, in the other position, it would cause the marble to drop through a hole and roll to the bottom of the ramp.The Digi-Comp II was not programmable, unlike the Digi-Comp I, an earlier offering in the E.S.R. product line that used an assortment of plastic slides, tubes, and bent metal wires to solve simple logic problems.".
- Q5275699 wikiPageExternalLink digicomp_2.html.
- Q5275699 wikiPageExternalLink watch?v=fLuvopVjAWg.
- Q5275699 wikiPageWikiLink Q10248435.
- Q5275699 wikiPageWikiLink Q1195339.
- Q5275699 wikiPageWikiLink Q183406.
- Q5275699 wikiPageWikiLink Q2532728.
- Q5275699 wikiPageWikiLink Q3262192.
- Q5275699 wikiPageWikiLink Q3913.
- Q5275699 wikiPageWikiLink Q4054157.
- Q5275699 wikiPageWikiLink Q448582.
- Q5275699 wikiPageWikiLink Q486902.
- Q5275699 wikiPageWikiLink Q5009755.
- Q5275699 wikiPageWikiLink Q5275698.
- Q5275699 wikiPageWikiLink Q5304290.
- Q5275699 wikiPageWikiLink Q5321658.
- Q5275699 wikiPageWikiLink Q5533156.
- Q5275699 wikiPageWikiLink Q620702.
- Q5275699 wikiPageWikiLink Q724409.
- Q5275699 wikiPageWikiLink Q724775.
- Q5275699 wikiPageWikiLink Q8408267.
- Q5275699 wikiPageWikiLink Q846354.
- Q5275699 comment "The Digi-Comp II was a toy computer invented by John Thomas Godfrey and manufactured by E.S.R., Inc. that used marbles rolling down a ramp to perform basic calculations. A two-level masonite platform with guides served as the medium for a supply of marbles that rolled down an inclined plane moving plastic cams as they went.".
- Q5275699 label "Digi-Comp II".