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Reference.org
Digi-Comp II
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<p>The Digi-Comp II was a toy computer invented by John "Jack" Thomas Godfrey (1924–2009) in 1965 and manufactured by <a href="/facts/E.S.R.%2c_Inc./fWMm9hV3">E.S.R., Inc.</a> in the late 1960s, that used 1⁄2 inch (12.5 mm) <a href="/facts/Marble_(toy)/nftcE5pU">marbles</a> rolling down a ramp to perform basic calculations. </p>