If you have that happen, either by dropping your calculator, removing both batteries simultaneously, or clearing it by accidental keystrokes, knowing how to reprogram the calculator could save you hundreds of dollars.
Not only that, but through programming your calculator, you will gain some understanding as to how the programs work, allowing you to make better use of the HP 35s and even motivating you to create your own functions.
Most of the programs in this guide build upon each other, making this guide a quick one to input. Before using the guide, I had previously never tried to program the calculator.
The guide does a perfect job explaining exactly what the HP 35s is capable of doing. Easycogo is another great programming guide for the HP 35s.
Easycogo adds additional programs — like a Program Menu — that make using the HP 35s even easier. Equations offer quick solutions for simple, one-equation problems. A couple of useful equations they offer are some loan payments, photogrammetry, and trigonometry formulas, among others.
You should know where to find these equations yourself online at this point, and after messing around with the HP 35s for a bit, you can figure out how to input these into the equation menu yourself. While looking at the guide, you might be a bit intimated given that it is not that detailed for new users.
Step through the execution of the program labeled A. Use a radius of 5 for the test data. Check that Program—entry mode is not active before starting:. Entering and displaying data The calculator's variables are used to store data input, intermediate results, and final results. Variables are identified by a letter from A through Z, but the variable names have nothing to do with program labels.
In a program, access data in the following ways: From an INPUT instruction, which prompts for the value of a variable. This is the most useful technique. From automatic equation prompting if enabled by flag 11 set. This is also handy while using equations.
In a program, information can be displayed in the following ways: With a VIEW instruction, which shows the name and value of a variable. On the stack - only the values in the X and Y registers are visible. In a displayed equation if enabled by flag 10 set. The "equation" is usually a message, not a true equation. This display includes the existing value for the variable, such as. The value keyed in then writes over the contents of the X—register and is stored in the given variable.
If the displayed value is not changed, then that value is retained in the X—register. The program for the area of a circle shown above with an INPUT instruction for radius 'r' looks like this:. In the previous example, the only input needed is the radius, which we can assign to R.
In the beginning of the program, insert an INPUT instruction for each variable whose value will be needed. Later in the program, when the part of the calculation that needs a given value is written, insert a recall RCL variable instruction to bring that value back into the stack. This way some memory space is saved. However, in a long program, it is easier to input all of the data up front, and then recall individual variables as required. Remember also that the user of the program can do calculations while the program is stopped, waiting for input.
This can alter the contents of the stack, which might affect the next calculation performed by the program. If the data is collected in the beginning and recalled during calculation, the stack's content are prevented from being altered just before a calculation. The value displayed and the contents of the X—register will be the current contents of R.
To leave the number unchanged, just press. To change the number, type the new number and press. This new number writes over the old value in the X-register. Enter a number as a fraction if required. For calculating a number, use normal keyboard calculations, then press. After pressing , the results of the expression will replace the expression and display on line 2; it will also be saved in the X-register.
The current value for the variable remains in the X—register. Pressing during digit entry clears the number to zero. This is a display only, and does not copy the number to the X—register. If 'Fraction' display mode is active, the value is displayed as a fraction. Press copies this number to the X—register. If the number is longer than 14 characters, such as binary, complex, or vector numbers, pressing and displays the remaining digits.
Pressing clears the contents of the displayed variable. Press to continue the program. Pressing during program entry inserts a STOP instruction. This will display the contents of the X-register and halt a running program until it is resumed by pressing from the keyboard.
Pressing during program entry inserts a PSE pause instruction. This will suspend a running program and display the contents of the X-register for about 1 second - with the following exception: if PSE immediately follows a VIEW instruction or an equation that is displayed flag 10 set , the variable or equation is displayed instead - and the display remains after the 1-second pause. Pressing or will interrupt a running program at any time. The program completes its current instruction before stopping.
If a program is interrupted and , , or are pressed, then the program cannot be resumed with. Re-execute the program instead label line number. If an error occurs in the course of a running program, program execution halts and an error message appears in the display.
To see the line in the program containing the error—causing instruction, press. The program will have stopped at that point. Editing a program A program can be modified in program memory by inserting, deleting, and editing program lines. If a program line contains an equation, the equation can be edited.
To delete a program line: Select the relevant program or routine and press or to locate the program line that must be changed. Hold the cursor key down to continue scrolling.
To delete the line that needs to be changed - press. After pressing , the Undo function is active. The pointer then moves to the preceding line. Exit program entry or. To insert a program line: Locate and display the program line that is before the line which needs to be inserted. For example, to insert a new line between lines A and A of a program, first display line A, then key in the instruction or instructions.
Subsequent program lines, starting with the original line A, are moved down and renumbered accordingly. To edit an operand, expression or equation in a program line: Locate or display the program line that needs to be edited.
Press or to start editing the program line. While editing a program line cursor active , if the program line is empty, using will have no effect. To erase the program line, press and the program line will be erased. Use and key to review long program lines and without editing them. In ALG mode, cannot be used as a function; it is used to validate a program line.
An equation can be edited in any mode, regardless of the mode in which it was entered. Clearing one or more programs To clear a specific program from memory: Press 2PGM and display the label of the program by pressing or. Press to cancel the catalog, or to back out.
Press 3PGM. Please check our Support page or feel free to contact us at office easycogo. Easycogo Survey Program for the HP 35s The Easycogo Survey Program contains simple, complete descriptions of all individual programs and easy step-by-step RPN mode instructions to enter all of the programs, which you won't need to do if you purchase the preprogrammed calculator.
The entire Easycogo Survey Program is configured to display simple, obvious, survey English text messages for each piece of data before the appropriate data input prompt or output display, so you don't need to remember any obscure codes or values, as you can see in any of the program demo videos.
Possibilities for application of the included programs are endless, though a brief summary of the program functionality is as follows:. AS IF THAT WASN'T ENOUGH: Much of the input and resultant data from most of the individual programs will be automatically saved and displayed for optional use in following appropriate input prompts within that program and other subsequently executed programs until revised by another similar input or calculation , or for easy recall by the displayed alphabetical storage label, even if the calculator was turned off.
Real-world example: You used Inverse to determine the azimuth from point 1 to point 2 before being interrupted by a client. Now you are finally able to continue the job and decide to begin traversing from point 2 to point 3. Since point 3 was located by zenith and slope distance, you select the slope traverse option and enter the appropriate vertical data. You then select the Traverse Horizontal option, in which the prompt for a backsight reference azimuth will automatically display the azimuth from yesterday's inverse for optional acceptance, and the prompt for coordinates to traverse from will automatically show the coordinates of yesterday's input coordinates for point 2.
Additionally, the prompt for the horizontal distance to point 3 will be automatically carried over from Slope Traverse and displayed for optional acceptance. Continuing the traverse to point 4 will have much of the appropriate information "moved up" for easy acceptance and continued traversing.
Back to Purchase Options for the HP 35s. Easycogo Survey Equations for the HP 35s The Easycogo Survey Equations program contains contains simple, complete descriptions of all individual equations and their variables, along with easy step-by-step instructions to enter all of the equations, which you won't need to bother with if you purchase the preprogrammed calculator.
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