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Model R47

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Model R47
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Description

The next RPN scientific

The R47 is a powerful, RPN-based programmable scientific calculator
with an extensive feature set. Its software has been refined over
many years, born from the vision of a dream calculator developed by a
team of engineers and mathematicians, all dedicated calculator
enthusiasts.

Background and lineage

Community-developed and manufactured by SwissMicros, the R47 runs
firmware that is functionally identical to that of the C47, which
offers a way to transform a DM42n into a feature-rich RPN calculator
using a dedicated keypad overlay.

The C47/R47 firmware originated as a fork of the WP43 project, itself
derived from the WP34S. A core component carried through this lineage
is the decNumber library by Mike Cowlishaw, also used in GCC for
precise decimal arithmetic.

Inspired by the HP-41C and HP-42S, the R47 builds on this foundation
with a redesigned keypad featuring two shift keys, preserving a
familiar feel while being entirely new in execution.

R47 calculator features

  * Advanced Math Capabilities:
      + Solve equations and systems of equations.
      + Perform definite and indefinite integration.
      + Handle matrix and vector calculations.
      + Work with complex numbers.
      + Utilize base-n arithmetic.
      + Provides 34 digits of precision; exponents to +-6144; up to
        1000 named variables.
      + Utilizes scientific calculator functions like trigonometry,
        hyperbolics, logs, and antilogs.
      + Features a 2-variable statistics with best-fit modelling and
        basic plotting.
  * Programming and Editing:
      + Create programs using a multi-line editor.
      + Keystroke programmable with tests, flags, looping, and
        branching.
  * Engineering and Utilities:
      + Conduct financial and date-based calculations, including time
        value of money operations.
      + Apply built-in unit conversions and library of constants.
      + Perform date and time math as well as built-in clock.
      + Equation writer with support for solving, numeric integration
        and derivatives, and basic plotting.
  * Display and User Interface:
      + Features a high-resolution display with 4 stack levels, 3
        rows of menus, and status bar always shown.
      + User-customizable keyboard and softkey-based menus.
  * Data Management:
      + I/O to built-in flash memory or via USB for backing up and
        restoring states, programs, and configuration.







Specifications



Aspect        Details
Construction  case made from stainless steel, matte black Physical
              Vapour Deposition (PVD) coated and laser engraved
Software      custom calculator implementation running on SwissMicros
              DMCP operating system (no emulation)
Processor     ultra-low-power ARM(r) Cortex-M33(r), at max. 160 MHz
Flash memory  64 MBit additional flash
Floating      uses math library with IEEE 754-2008 128-bit BCD
Point         floating point format
Standard
ISO           ISO/IEC TR 24732
Conformity
Display type  monochromatic ultra-high contrast (14:1) transflective
              memory LCD display
Display       400 x 240 pixels
resolution
Display       58.8 mm x 35.28 mm
active area
Display dot   147 um x 147 um
pitch
Connectivity  USB-C, connects as USB mass storage device
(PC)
Battery type  1 x CR2032 3V lithium coin cell
Size          77 mm x 144 mm x 12 mm
Weight        180 g
Warranty      5 years
Documentation R47 documentation

The R47 was developed in collaboration with the C47/R47 team. The
hardware is provided by SwissMicros, and the software by the C47/R47
team.

For software updates and documentation, please contact the C47/R47
team at https://47calc.com/.

[ ] I understand that the R47 firmware is not written, distributed,
or maintained by SwissMicros, and I agree that any support for the
R47 firmware will be requested and handled by the R47 team via email
to support@47calc.com
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The software (firmware) is currently in beta.



Please note:
The R47 wil lget dispatched on Monday, November 17th 2025.

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