哈佛二型(Harvard Mark II)是由美國海軍資助、霍華德·艾肯和格麗絲·賀伯於1947年設計製造的機電計算機[1][2]。哈佛二型是由高速電磁繼電器構成,它重23噸,加法運算時間為0.125秒,乘法運算時間為0.750秒[3][2][4]。
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