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The HP 19C was introduced in 1975, and was using LED display. At the same time, Hewlett-
The suffix C indicates that this calculator has Continuous memory. A very big advantage from the normal programmable calculators, because once you turn the power OFF you still keep the program amd registers. I owned an HP-
The HP-
The HP-
The switch on the top left will set the calculator in program mode or run mode. The one on the right will set the behavior of the printer (either Manual, Trace or Normal).
Without going into all the technical details, we can see that we have all the scientific functions available, and 98 steps of programming.
This calculator, as all the other ones made by HP at that time, is using the Reverse Polish Notation (RPN) system to calculate. For those of you who are not familiar with it, instead of entering the operation like you see it on the paper, you are using registers.
Example: 34 + 45 = ?
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By pressing the ENTER key, you move the first number to the next register. Then you type the second number, and you specify what to do with these 2 numbers.
I remember being confused the first time I used my HP-
This is a favorite for collectors as the number of units for sale is very small. I only recorded 17 transactions during the past few years with an average price of $294.
If you see one, jump on it !