Getting Started with WP34s: Installation, Features, and TipsWP34s is a community-driven firmware that transforms several models of HP calculators into powerful RPN (Reverse Polish Notation) scientific and programmable tools. It combines the legacy of HP’s advanced calculator design with modern firmware features, making it a favorite among engineers, scientists, hobbyists, and RPN enthusiasts.
What is WP34s?
WP34s is an open-source firmware project that builds on the HP-34S concept and extends it far beyond the original capabilities. It runs on selected HP calculator hardware (most commonly the HP 30b and HP 20b, and microcontroller-based clones) and provides an extensive set of scientific, statistical, programming, and utility functions — all using a classic RPN interface.
Supported Hardware
Before installation, confirm your hardware compatibility. WP34s commonly runs on:
- HP 30b and HP 20b (these are widely used because of their cheap availability and appropriate hardware).
- WP34s-specific hardware builds and hobbyist boards that replicate the required microcontroller and keypad layout.
- Some enthusiasts install WP34s on modified HP calculators or on custom firmware-capable clones.
Make sure to check the WP34s project documentation for the precise list of supported devices and any hardware revision notes.
Key Features
- RPN (Reverse Polish Notation) entry and stack-based calculations.
- Extensive scientific functions: trigonometry, hyperbolic functions, complex numbers, matrix operations.
- Advanced programming capability with conditional branching, loops, local labels, and indirect addressing.
- Financial and statistical functions, including regressions and multi-variable statistics.
- Customizable keymaps and user-defined functions.
- Persistent memory for programs and user settings.
- Multiple display modes and configurable angle units (degrees/radians).
- A helpful interactive help system built into some versions.
Installation Overview
Installation requires caution: firmware flashing can permanently alter your calculator. The process varies by device, but the general steps are:
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Gather tools:
- A compatible calculator (HP 30b/20b or supported clone).
- A USB-to-serial adapter (FTDI or similar) or the specific programmer used by the WP34s community.
- Appropriate cables and connectors for your calculator model.
- A computer with the flashing utilities (often provided by the WP34s project).
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Backup original firmware (if possible):
- If you plan to revert to factory firmware, extract and save the original ROM image when the tools allow.
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Obtain the firmware:
- Download the latest stable WP34s firmware image and installation instructions from the project’s repository or website.
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Connect and enter bootloader/programming mode:
- Each calculator model has a specific key sequence or hardware jumper to enter programming mode. Follow the device-specific guide.
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Flash the firmware:
- Use the provided flashing tool to upload the WP34s binary. Monitor for success messages and follow any post-flash steps.
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Verify installation:
- Power-cycle the calculator and confirm WP34s starts. Run a few known commands (e.g., simple arithmetic, degree mode check) to ensure proper operation.
If you are uncomfortable with electronics or firmware flashing, consider asking an experienced community member for help or using an emulator to learn WP34s first.
First-Time Setup and Configuration
After a successful installation:
- Reset settings to default if the device warns of previous configurations.
- Configure angle mode (DEG/RAD) and number format to your preference.
- Learn the stack: X, Y, Z, T registers and how RPN manages operands.
- Explore the catalog of functions and the help pages (if provided) to familiarize yourself with key labels and secondary functions.
Tip: print or keep a key reference sheet nearby — WP34s has many functions mapped to shifted keys.
Basic RPN Workflow Examples
- Simple addition: enter 3 ENTER 4 + → result on X = 7.
- Using a function (e.g., sine): 30 SIN (ensure angle mode correct).
- Programming example (pseudo-outline): create a small program to compute quadratic formula roots using stack operations and branching.
Programming on WP34s
WP34s supports an advanced program language with:
- Labels and local variables.
- Conditionals (tests and conditional jumps).
- Loops and subroutines.
- Indirect addressing and register manipulation.
Programming tips:
- Start with small programs, test each step interactively.
- Use comments and consistent labels where supported.
- Leverage existing community programs as learning references.
Advanced Features Worth Exploring
- Complex number arithmetic: store and manipulate complex values directly.
- Matrix operations: matrix creation, inversion, determinants.
- Statistical regressions: linear, polynomial fitting, residuals.
- Macros and user-defined functions: encapsulate frequent calculations.
- Calibration and hardware tweaks: some users adjust contrast or replace keycaps for longevity.
Common Issues & Troubleshooting
- Failed flash: double-check connections, drivers, and bootloader mode. Try another USB cable/adapter.
- Unresponsive keys or display: verify power/battery, reset the device, check for wiring issues on modded hardware.
- Unexpected behavior: confirm you’re in the correct mode (RPN vs. ALG where applicable), and ensure angle units are set correctly.
- Reverting to stock firmware: follow the documented restore procedure and keep original images if you backed them up.
Resources and Community
WP34s has an active, knowledgeable community. Useful resources include:
- The official WP34s repository and documentation.
- Community forums and mailing lists with installation guides and program sharing.
- Emulators that let you run WP34s on a PC for practice before flashing hardware.
Final Tips
- Practice RPN basics on an emulator or a borrowed device before committing to a hardware flash.
- Keep a small notebook of frequently used key sequences and programs.
- Back up any valuable programs or settings after you’ve configured the device.
- Respect the hardware: static precautions and careful connector handling reduce risk during flashing.
If you’d like, I can:
- Provide step-by-step flashing instructions for a specific calculator model (HP 30b or HP 20b).
- Create a printable quick-reference keymap.
- Draft sample WP34s programs (e.g., quadratic solver, factorial, matrix inversion).
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