KAHAN: “The HP 12C was successful enough that they were willing to take my advice about building the 15C, but not take my advice about how many to build. William Kahan regarding the quantity of HP-15C that he estimated HP could sell per year: Tangentially related to the quantity of HP-15C units that HP produced.įrom Dr. Could it be that the nnnnn component of the 15C serial number is not the number produced in a week but rather the sequential number produced in the year? This seems to me to be an implausible number even without considering the other models that HP was producing at the same time. 80,000 a week for 50 weeks a year for 7 years (1982 to 1989) is 28 million with an additional 14 million or more from Brazil (assuming 40,000 per week given the Brazilian serial number 38,564) giving an estimated total of 42 million. On HP 15Cs made in the USA serial numbers appear on the top edge in the form yywwAnnnnn where the number yy + 60 denotes the year ww denotes the week produced A, the USA (B for Brasil) and nnnnn the sequential number of the calculator produced in that particular week.Ĭonsider the following serial numbers of HP 15C calculators:Īlthough the sample is small we can deduce from calculator number 79,855 that at least 80,000 were produced a week in the USA in 1985.
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