Hello my name is Eric and I'm going to tell you something about my Hewlett Packard calculator collection.
The reason that I collect Hewlett Packardcalculators is because I love the way they work with Reverse Polish Notation.
I got hooked, I got interested in HewlettPackard calculators.
And I decided to start collecting them.
The first scientific pocket calculator evercreated was the HP-35.
It came in an optional sturdy carrying case, together with its pouch, the adapter.
Here it is.
This is actually the second model.
The first model is very rare, it has an extradot behind the ON.
After that came this version.
As you can see there is no actual number onthe calculator.
It doesn't say HP-35.
It just says Hewlett Packard here.
Of this version this is the early one.
It has a raised dot on the 5.
Soon afterwards it became more popular than they thought and they started creating more versions.
So here are two later iterations of the samecalculator.
As you can see here it says Hewlett Packard35, and here as well.
And the difference here is that they changedthese top keys.
Instead of putting the functions above thekey, they started creating the functions on the key.
So three versions of the HP-35 calculator.
It was introduced early 1972 and it was ultimately discontinued back in 1975.
In 1973 after the succes of the HP-35, Hewlett Packard created what is now called the Classic series.
It was the HP-45, 46, the HP-80 and 81.
I unfortunately of that classics series onlyhave the HP-45.
In 1975 they introduced the Woodstock series, not named after the music festival but after the Peanuts character by the way.
Which included the HP-21 and the HP-25.
As you can see here I have these in packaging.
With the manual.
Here is the HP-21 and similarly let me show you the HP-25 So very similar calculators.
Yeah there's an extra shift so you can clearlysee it has more functions.
The blue and orange shift functions.
The blue labels are here below and the orangeshift functions are above the keys.
And this one only has one shift it was a somewhatcheaper calculator.
1976 brought more innovations for Hewlett Packard They brought this HP-67 calculator which had a magnetic card reader in it so you could read the cards that you programmed your software with and then you could label the labels here ABCDEso you could read what their functions were.
Also I have this HP-97 this is a printingdesktop calculator.
1977 brought printing pocket calculators for Hewlett Packard.
You have this rather basic function HP-10and this rather advanced and a bit rare HP-19C So printing pocket calculators.
Maybe it's a good moment to talk a bit about the serial numbers Not sure if it shows on the camera this serial number [It doesn't, sorry] As you can see this serial number starts with1909S.
The first two digits are actually the yearit was produced minus 1960.
So this one was produced 1979, in week number9 and the S stands for Singapore.
Let me show you an earlier example calculatorHere I have on of the early models HP-35s.
So 1975, 3rd week, also S is Singapore.
And here very early HP-35 says 1230A The A stands for America, it was created in Corvallis in Oregon.
So 12 is 1972, 30st week.
In 1978 Hewlett Packard introduced a verynice series called internally the Spice series.
It was the 31E, 32E, etc.
The E stood for Engineering.
I will show you some of these calculators.
The 31E The 32E There's a 33Edown here And the 38E In 1979 Hewlett Packard introduced the last series with LED display It was a continuation of the earlier 30-series which ended on E These were the same calculators but called 33C, 34C etc.
Here you have two examplesThese were exactly the same calculators and the C stood for Continuous Memory that was the only difference.
So here you have the 33E and 33C side by sideand the only difference was Continuous Memory which meant that if you changed your batteriesthe program that you put in is kept in the 33C while it was not the case in the 33E.
And that concludes the LED era.
The era where LED displays ruled the calculators, drained our batteries, And in 1979 a nice invention was done in LCD, LIquid Crystal Display as we all know it.
Which was much more nice for the battery consumption and Hewlett Packard started creating LCD display calculators from 1979 onwards.
In the next episode I'm going to show youthe early LCD calculators by Hewlett Packard including of course the HP-41, later on the28 and the 48 up to the palmtops.