HP28S MANUAL PDF

However, by that capability had become so common on calculators that it was no longer a feature of distinction, as it was an assumed characteristic of all serious scientific and business calculators. Clamshell[ edit ] The HP calculators shared a flip-open "clamshell" case. On the left side of the flip, there is an alphabetic keyboard in alphabetic order. On the right was a typical scientific keyboard layout.

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This model did symbolic math, used named variables, understood many data types and was the first full RPL calculator. It was extremely powerful with a wealth of functions and many features inherited from the HPC including infrared printing which freed the user from cable clutter, labeled soft keys, menus and the dedicated alphanumeric keyboard which made creating complex programs and expressions more convenient. This page only describes new features which are not obviously RPL-related, though this is sometimes a fine distinction.

Rather than using the same key to set or solve for a variable depending on whether a number had just been entered, the HPC user pressed the key alone to set any variable and pressed SHIFT followed by the same key in order to solve for it. Unit Conversions The calculator came with a large library of units and allowed the user to build more complex unit strings. To convert from one unit to another, the user entered the number followed by enter and then entered the units to convert from and to either via the unit catalog or by typing them on the alpha keypad.

The convert button was then pressed to do the actual conversion. The user had control over the scale and position and could move the cross hairs to a place on the plot and have the calculator send the coordinates to the stack. Plotting was a convenient way of finding zeros, minimums and maximums of expressions.

Binary Math A substantial set of binary math functions were provided. The word size could be set from 1 to 64 bits, and the display base could be binary, octal, decimal or hexadecimal. Being an RPL calculator, it was not necessary to enter a special mode to work in binary as was the case with the HPC.

Instead, binary numbers were indicated by preceding them with a " ". The HPC went further by also showing the proper arguments to each command.

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This is quite a challenging task in trying to figure it out. I did quite a bit of searching and trying before documenting this post. Why would you want to open the calculator in the first place? My post is divided into 4 sections. So either I fix the calculator or I recycle it.

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HP-28 series

HPs left and right panels. I stuck some other rubber feet there. I never took any programing course, but am a avid learner of math and computer stuff. I read the manuals from cover to cover.

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HP -28S Owner's Manual

This model did symbolic math, used named variables, understood many data types and was the first full RPL calculator. It was extremely powerful with a wealth of functions and many features inherited from the HPC including infrared printing which freed the user from cable clutter, labeled soft keys, menus and the dedicated alphanumeric keyboard which made creating complex programs and expressions more convenient. This page only describes new features which are not obviously RPL-related, though this is sometimes a fine distinction. Rather than using the same key to set or solve for a variable depending on whether a number had just been entered, the HPC user pressed the key alone to set any variable and pressed SHIFT followed by the same key in order to solve for it. Unit Conversions The calculator came with a large library of units and allowed the user to build more complex unit strings. To convert from one unit to another, the user entered the number followed by enter and then entered the units to convert from and to either via the unit catalog or by typing them on the alpha keypad. The convert button was then pressed to do the actual conversion.

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Open a HP 28S calculator

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