05-07-2014, 07:50 PM
Post: #3
 Steve Simpkin Senior Member Posts: 397 Joined: Dec 2013
My "first" electronic hand held calculator was a APF Mark25/Memory four-function model purchased in the spring of 1975, when I was 13, for around $30. I had wanted an electronic calculator since I discovered they existed around 1973 but it took me 2 years to convince my mother that buying a calculator would not ruin my ability to perform math by hand!. My second (and my first scientific model) was a Commodore SR4148R around December of 1976 for$65 (Sears). This model had 48 keys! I had already learned about HP calculators by this time and was lusting after the HP-25, but I could not afford it.

My next (and my first RPN calculator) was a Novus Mathematician I was given (free) in early 1977. Although it gave me my first taste of RPN, the three level stack, lack of scientific notation and missing instruction book was a big obstacle to using it. It just teased me more about getting the HP-25 I wanted so badly.

Somewhere around this time I bought and assembled a Sinclair Wrist Calculator (not a watch). Although it worked, it had mechanical problems and went through six expensive watch batteries quickly.

Finally on June 12, 1977, I purchased my HP-25 for \$116.00 (plus tax) from a "Calculator Store". The rest is history, as they say. I have owned many calculators since then but only use HP's for work or for "serious" play
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