The HP-16C was a LCD RPN programmable "programmers" calculator made by HP. The HP-16C had many functions an features that could be used by computer programmers. It was produced from 1982 to 1989. The HP-16C is also available as a simulation under Windows, HTML, Linux, IOS and Android. SwissMicros makes a DM16L replica version of the HP-16C. The HP-15C CE also contains firmware to operate as a HP-16C calculator (which can be used with an optional rubber overlay).

Links: The Museum of HP Calculators HP-16C page - HP-16C Documentation (English) - HP-16C Owner's handbook (English) - HP-16C Wikipedia page - HP-16C at MyCalcDB - HP-16C at HPDATAbase - HP Journal May 1983: HP-16C - EduCALC Catalog 12 - 1983 HP Voyagers - SwissMicros DM16L Product Page - Web online HP-16C Emulator - HP Article VA018 - Long Live the HP-16C - HP-16C Quick Reference - Hewlett Packard HP-16C - MoHPC General Software Library - CMOSC: Low-Power Technology for Personal Computer (Voyagers)

The DM15L (shown) and DM15 is made by SwissMicros and is an emulation of the HP-15C with enhancements. The DM15L is very similar in size to the HP-15C. The DM15 is smaller and has a membrane keyboard.

Links: DM15L Product Page - DM15L Documentation - A brief review of SwissMicros DM15L (video) - SwissMicros DM-15L - MoHPC General Software Library

The HP-32S was a mid-range RPN programmable scientific calculator made by HP. The HP-32S was an enhanced replacement for the HP-11C. It was produced from 1988 to 1991. It is also available as an emulation via EMU42 on Windows and Android.

Links: The Museum of HP Calculators HP-32S page - HP-32S Documentation (English) - HP-32S Owner's Manual (English) - HP-32S/SII Wikipedia page - HP-32S at MyCalcDB - HP-32S at HPDATAbase - EduCALC Catalog 41 - 1988 HP-32 - Step-by-Step Solutions: Engineering Applications (32S) - Tips and Programs for the HP-32S - Hewlett Packard HP-32S/SII - MoHPC General Software Library - HP 20s Calculator Screen/Keyboard Repair (video)

The HP-32SII was a mid-range RPN programmable scientific calculator made by HP. It was the sequel to the HP-32S. The HP-32SII was produced from 1991 to 2002. It is also available as an emulation via EMU42 on Windows and Android.

Links: HP-32S/SII Wikipedia page - HP-32SII Documentation (English) - HP-32SII at MyCalcDB - HP-32SII at HPDATAbase - Comparison of HP 32SII, HP 33S and HP 35S (CC video) - EduCALC Catalog HP-32SII - Inside the HP-32SII - HP 32SII Scientific Calculator (video series) - Hewlett Packard HP-32S/SII - MoHPC General Software Library - HP 32SII Calculator Keyboard/Screen Repair and other Pioneer models (video)

The DM32 is made by SwissMicros and is a simulation of the HP-32SII with enhancements. 171 functions, of which 75 are directly accessible from the keypad. Programmable. Conversions, statistics, fractions, equations, solver and more. USB-C connectivity to internal mass storage device. A calculator multi-state system allows switching between virtual calculators. Onboard hypertext help file. 

Links: DM32 Product Page - DM32 Documentation - SwissMicros DM32 Forum - HHC 2022 Video Presentation on the DM32 - DM32 Video Series (Logan West) - Shared DM32 Resources (Programs, Equations and State Files), HHC 2023: Update on SwissMicros DM32 (video) - OFFIMG library (forum) - OFFIMG Gallery - About DM32 (forum post) - DM32 update Procedure - Latest DM32 Firmware

The HP 33s was a mid-range RPN/Algebraic programmable scientific calculator made by HP and was an evolution of the HP-11C --> HP-32S --> HP-32SII line. The HP 33s was produced from 2003 to 2007. 

Note the HP 35s (shown below), made from 2007 to 2021, had almost the identical feature set as the HP 33s.

Links: Wikipedia HP 33S page - HP 33s Documentation (English) - HP 33s at MyCalcDB - HP 33s at HPDATAbase - HP33s Calculator Review - Comparison of HP 32SII, HP 33S and HP 35S (CC video) - HP 35s and HP 33s Demo on programming equation in equation mode (video) - HP-33S - Summing up the HP 33S - HP 33s Datasheet - MoHPC General Software Library - HP 33s Training Aids (Zip file)

The HP 35s was a mid-range RPN/Algebraic programmable scientific calculator made by HP and was an evolution of the HP-11C --> HP-32S --> HP-32SII --> HP 33s line. The HP 35s was produced from 2007 to 2021. It is also available as a simulation on Windows.

Note the HP 33S (shown above), made from 2003 to 2007, had almost the identical feature set as the HP 35s.

Links: Wikipedia HP 35s page - HP 35s Documentation (English) - Wikipedia HP 33S page - HP 35s at MyCalcDB - HP 35s at HPDATAbase - HP 35S Scientific Calculator Review (CC video) - Comparison of HP 32SII, HP 33S and HP 35S (CC video) - HP 35s Scientific Calculator (video series) - HP 35s Training Aids Collection (pdf) - A Matrix Multi-Tool for the HP 35s - Curve Fitting for the HP 35s - HP 35S Calculator Programs - HP 35s Programmable Scientific Calculator Review and Tutorial (video) - HP 35s Keyboard Repair (forum post) - Internal view of the HP 35s - Internal keyboard photos - Review: HP 35s Programmable Scientific Calculator - Hewlett Packard HP-35S - HP 35s and HP 33s Demo on programming equation in equation mode (video) - HP 35s Internal Photo - HP 35s Datasheet - The HP 35s - HP-35s Scientific Calculator Review - My review, HP 35s - HP Article VA030 - HP35S Storing Lotsa Lotsa Numbers - MoHPC General Software Library - Programming Notes and Hints for the HP 35s - The HP35S (forum post) - HP 35s (video series)

The HP-42S was a high-end RPN programmable scientific calculator made by HP. The HP-42S has over 600 functions and was designed to be software compatible with the HP-41C. It was produced from 1988 to 1995. It is available as an emulation via EMU42 on  Windows and Android.  A simulation (with enhancements) is also available via Free42. Free42 is written by Thomas Okken and is available on Windows, Mac, Linux, IOS and Android. Also see Plus42, an enhanced version of Free42.

Links: The Museum of HP Calculators HP-42S page - HP-42S Documentation (English) - Free42 (HP-42S Simulator) - HP-42S Owner's manual (English) - Plus42 (Enhanced Free42) - EMU42 (HP-42S and HP Pioneer series emulation) - HP-42S Programming Examples & Techniques - Step-by-Step Solutions: Electrical Engineering (42S) - Step-by-Step Solutions: Mechanical Engineering (42S) - Advanced Circuit Analysis with the HP-42S - An Easy Course in Using the HP-42S - Using Free42 (video) - HP-42S Wikipedia page - HP-42S at MyCalcDB - HP-42S at HPDATAbase - HP 42S Scientific Calculator (CC video) - EduCALC Catalog 59 - 1993 HP-42S - HP 42s Scientific Calculator (video series) - HP Article VA010 - Long Live the HP42S - Plus42 Review - An Enhanced HP-42S Calculator Simulator (CC video) - Hp 42s Calculator Repair & Upgrade (video) - Hewlett Packard HP-42S - Upgrading the memory of the HP 42S to 32KB - MoHPC HP-41C Software Library - New MoHPC HP-41C Software Library - MoHPC General Software Library - free42 Base-N Tools - Possible to turn off a pixel? - HP-42S Calculator: How to open case

The DM42 is made by SwissMicros and is a simulation of the HP-42S with enhancements. Its software is based on Free42, a simulation of the HP-42S written by Thomas Okken. The enhancements over the HP-42S (including an unlimited stack size) are explained at the Free42 website. Based on a decimal floating-point math library and IEEE 754-2008 quadruple precision decimal floating-point, encoding numbers in 16 bytes and giving 34 decimal places of precision with exponents ranging from -6143 to +6144. This hardware platform is also being used to create several new calculators such as the WP43 and C47 projects shown near the end of this page. A RPL calculator project named DB48X is also under development for this platform (see the Additional Links page for more information).

Links: DM42 Product page - DM42 Documentation - HP-42S Owner’s Manual - HP-42S Programming Examples and Techniques - Free42 Manual - Free42 website - SwissMicros DM42 Forum - HP-42S Programming Examples & Techniques - Step-by-Step Solutions: Electrical Engineering (42S) - Step-by-Step Solutions: Mechanical Engineering (42S) - Advanced Circuit Analysis with the HP-42S - An Easy Course in Using the HP-42S - SwissMicros DM42 Review (CC video) - Comparison of HP42s and DM42 features (video) - DM42 Scientific Calculator (video series) - DM42 (SwissMicros) - Solving Various Engineering Problems (video) - Review of the DM42 Scientific Calculator (video) - SwissMicros DM42 Review (video) - Speed comparison HP-42S vs. DM42 vs. DM41L - OFFIMG library (forum) - OFFIMG Gallery - DM42: The internal view - MoHPC HP-41C Software Library - New MoHPC HP-41C Software Library - SM DM42 Software Library - DM42 replacement foil with domes (for early units) - free42 Base-N Tools - Displaying text strings on the DM42 screen (forum post) - Possible to turn off a pixel? - HP-42S Fast Mode

The HP-41C series were high-end programmable, expandable, continuous memory handheld RPN calculators made by HP from 1979 to 1990. The original model, HP-41C, was the first of its kind to offer alphanumeric display capabilities. Later came the HP-41CV and HP-41CX, offering more memory and functionality. Various simulators and emulators are available on Windows, Mac, Linux, IOS and Android. 

Links: The Museum of HP Calculators HP-41C/CV/CX page - HP-41C/CV Documentation (English)- HP-41CX Documentation (English) - HP-41C Series Wikipedia page - HP-41C at MyCalcDB - HP-41CV at MyCalcDB - HP-41CX at MyCalcDB - HP-41C at HPDATAbase - HP-41CV at HPDATAbase - HP-41CX at HPDATAbase - HP-41C Software Library - HP41.org (HP-41 documents and emulators) - HP Journal Mar 1980: HP-41C - HP Key Notes Aug 1979: HP-41C - HP-41C Flyer (1979) - HP-41C Flyer (1982) - EduCALC Catalog 12 - 1982 HP-41C CV - Repairing a HP-41C/CV/CX -  HP Journal Jan 1981: HP-41C Bar-Code Wand - HP 41CV calculator repair of bad battery contacts (video) - HP41-CV Calculator (video) - HP 41C - Advantage Pac (CC video) - HP 41C/41CV/41CX (video series) - EEVblog #582 - HP41CV Calculator Teardown -Hewlett Packard HP-41C/CV/CX/CL - HP 41C Repair - HP-82104A card reader - Inside the HP-41CV fullnut - Inside the HP-41CV halfnut - Inside the HP-41CX fullnut - Inside the HP-41CX halfnut - HP-41C/CV/CX Service Manual - Repairing an HP-41CX - Hewlett Packard 41C Series (video series) - MoHPC HP-41C Software Library - New MoHPC HP-41C Software Library - What is HP-41C half and full nut? - HP-41C Intermittent Key Repair (forum post) - The HP41 Corner (HP-41C repair book & parts) - The HP-41 System – 30 Years Old - Refurbishment of an HP41 Rechargeable Battery Pack - HP 41C/41CV/41CX (video series)

The Systemyde 41CL takes advantage of modern technology to significantly add to the capabilities of the Hewlett-Packard 41C system. The 41CL circuit board replaces the original CPU board in the calculator and provides all the features of an HP-41CX except for the Time Module. CX Time functions (the software) are included, but a Time module plugged into a Port, or our new Time Module Clone, is required for full timer functionality.

Links: 41CL Calculator web page - 41CL Documentation - MoHPC HP-41C Software Library - New MoHPC HP-41C Software Library

The DM41L (shown) and DM41 is made by SwissMicros and is an emulation of the HP-41CX in a landscape format. The DM41L is very similar in size to the HP-15C. The DM41 is smaller and has a membrane keyboard.

Links: DM41L Product Page - DM41L Documentation - Review: SwissMicros DM41L - DM-41L - MoHPC HP-41C Software Library - New MoHPC HP-41C Software Library

The DM41X (shown) is made by SwissMicros and is an emulation of the HP-41CX with enhancements. It has access to most of the software and application ROMs produced for the HP-41C/CV/CX. Easily share or back up your programs or your entire DM41X environment and use hundreds of existing, professionally developed software applications with this rugged calculator sporting a stainless steel case and a Gorilla Glass screen. It was introduced in 2020.

Links: DM41X Product Page - DM41X Documentation - SwissMicros DM41X Forum - SwissMicros DM41X Review (CC video) - Review: Swiss Micros DM41X - HP 41C - Advantage Pac (CC video) - DM41X User Software Contributions - MoHPC HP-41C Software Library - New MoHPC HP-41C Software Library

The WP 34S (shown) project created custom firmware that can be loaded into a HP 20b or HP 30b financial calculator (both discontinued models) to turn it into a full-featured scientific RPN programmable calculator. Key stickers and a faceplate overlay label need to be applied to create the redefined keyboard. 

The WP 31S is a stripped-down version of the WP 34S with no programming capability.

There is also a version of WP 34S firmware available to load into the DM42 calculator (which is a currently produced model). It does not require an overlay or key stickers.

The WP 34S/WP 31S firmware (for the HP 20/30b) and documentation is available at: https://sourceforge.net/projects/wp34s/

The WP 34S firmware port for the DM42 and documentation (see README) is available at: https://gitlab.com/njdowrick/wp34s-for-dm42

An emulation of the WP 34S is available on Windows, Mac, Linux, IOS and Android.  An emulation of the WP 31S is available on Windows, Mac, Linux and IOS.

Links: WP 34S Project Page - WP 34S Documentation (source) - WP 34S Documentation (English) - WP 34S Beginners Guide - WP 34S Emulator Software - WP 31S Emulator Software - WP 31S Documentation (English) - WP 34S Calculator Review (CC video) - WP34S/WP31S key and bezel vinyl labels for HP20b/30b - WP-34S

The WP43 project created custom firmware that can be loaded into a SwissMicros DM42 calculator to turn it into a more full-featured scientific programmable RPN calculator (with 2 shift keys). SwissMicros made a pilot production run of WP43 units with the needed key labels and face plate but has not made any more of them since then. Users can still create a WP43 calculator by applying custom key stickers and a custom face plate label to a DM42 and then re-flashing it with WP43 firmware.  It is also available as an emulation under Windows.

The WP43 firmware, emulator software and documentation is available at the WP43 Project Page.

Links: WP43 Project Page - WP43 Owners Manual - WP43 Reference Manual - WP43 Software Releases - SwissMicros Forum - WP43 key and bezel vinyl labels for DM42

The C47 project (previously named C43) is a fork of the WP43 software that uses the original HP-42S/WP42 key labels (and its single shift key) so that key stickers are not required. It retains most of the functionality for the WP43 but has a different user interface. It does require a custom faceplate label to be applied to a DM42 and then re-flashing it with C47 firmware firmware. It is also available as an emulation under Windows.

The C47 firmware and documentation is available at the C47 Project Page.

Links: C47 Project Page - C47 face plate template - SwissMicros Forum - C47 bezel vinyl label for DM42 -  C47 plastic bezel for DM42 - C47 bezel replacing the stock DM42 plate (video) - C47 Wiki Home - The C47 Calculator: Getting Started Guide - The C47 Calculator (video series) - C47 Quick Reference Guide