The HP-28C/S is a high end RPN/RPL graphing calculator made by HP. With the HP-28C, Hewlett-Packard completely revamped the scientific calculator. This model did symbolic math, used named variables, understood many data types and was the first full RPL calculator. The original HP-28C (with 2KB memory) was produced from 1987 to 1988. The HP-28S (32KB memory) was produced 1988 to 1992. It is also available as an emulation/simulation under Windows, IOS and Android.

Links: The Museum of HP Calculators HP-28C/S page - HP-28C Documentation (English) - HP-28S Documentation (English) - HP-28C/S Apps and Documentation - HP-28C/S Wikipedia page - HP-28C at MyCalcDB - HP-28S at MyCalcDB - HP-28C at HPDATAbase - HP-28S at HPDATAbase - HP 28C Scientific Calculator (CC video) - HP Journal Aug 1987: HP-28C - HP 28s Scientific Calculator (video series) - Open a HP 28S calculator - Hewlett Packard HP-28S/C - HP-28S Quick Reference - HP 28S: shucking the clamshell - HP-28S Review - Modern Electronics Magazine HP-28C Review - HP-28 Battery Door Fix - HP 28S keypad issue-definitive repair solution - Why the HP-28C only had 2K of RAM - The HP-28 Pocket Book

The HP-48SX/S is a high end RPN/RPL graphing calculator made by HP. This innovative graphing calculator combined the best features of the HP-28S and HP-41CX series and produced a line of HP-48/49/50 models that was in production until 2015, an astonishing 25 years. See here, here and here for a summary of its features. The HP-48SX (with 32KB memory and expansion slots) was produced from 1990 to 1993. The HP-48S (32KB memory, no slots) was produced from 1991 to 1993. It is also available as an emulation under Windows, IOS and Android.

Links: The Museum of HP Calculators HP-48SX/S page - HP-48SX Documentation (English) - HP-48S Documentation (English) - HP-48SX/S Apps and Documentation - HP-48SX/S Wikipedia page - HP-48SX at MyCalcDB - HP-48S at MyCalcDB - HP-48SX at HPDATAbase - HP-48S at HPDATAbase - Learning About the HP 48 (HP video) - HP Journal June 1991: HP-48SX - EduCALC Catalog HP-48SX - HP 48SX Calculator from 1990 (CC video) - Hewlett Packard HP-48S, SX, G, G+, GX, GII - HP 48G+ gets repaired! (video) - HP 48SX Repair - Power On Failure -- Keyboard Failure (video) - Opening the HP48 - HP 48SX Keyboard Replacement and LCD Upgrade - HP48 Repairs - How to Make a Serial Cable - HPComm Link Software- HP-48 (video series) - Official HP48 FAQ - HP48 series - HP 48 Repair - Mostly Non-Destructive HP-48 Series Keyboard Fix - HP 48SX Calculator Demonstration Card (video) - GX Library - HP-48SX Books by William C. Wickes - HP-48SX Books by Jim Donnelly - Repairing/Restoring 48SX

The HP-48GX/G is a high end RPN/RPL graphing calculator made by HP. It replaced the HP-48SX/S models and was faster with more features, such as 3D-plotting and a new forms-based interface. Much of the HP Solve Equation Library card is now built-in. See What's new in the HP48 G/GX? for more informations about the changes. The HP-48GX (with 128KB memory and expansion slots) was produced from 1993 to 2003. The HP-48G (32KB memory, no slots) was produced from 1993 to 2003. The HP-48G+ (128KB memory, no slots) was produced from 1998 to 2003. It also features a high contrast LCD on lat production units. These are also available as an emulation under Windows, IOS and Android.

Links: HP-48GX Documentation (English) - HP-48G/G+ Documentation (English) - HP-48G/GX Apps and Documentation - HP-48GX/G/G+ Wikipedia page - HP-48GX at MyCalcDB - HP-48G at MyCalcDB - HP-48GX at HPDATAbase - HP-48G at HPDATAbase - HP-48G+ at HPDATAbase - HP Journal Aug 1994: HP-48GX - HP 48 User RPL and System RPL (SysRPL) Programming Comparison (video) - HP 48GX / RPN and HP Prime / Algebraic (9 videos) - Hewlett Packard HP-48S, SX, G, G+, GX, GII - HP 48G+ gets repaired! (video) - HP 48SX Repair - Power On Failure -- Keyboard Failure (video) - Opening the HP48 - HP 48SX Keyboard Replacement and LCD Upgrade - HP48 Repairs - How to Make a Serial Cable - HPComm Link Software - HP-48GX Graphing Calculator from 1993 (CC video) - HP-48 (video series) - Official HP48 FAQ - HP48 series - HP 48G - Reverse Polish Lisp (RPL) Programming (CC video) - HP 48 Repair - HP 48 Calculator Display Versions (video) - What is the difference between the HP48 G/GX and the HP48 S/SX? - HP-48SX Books by William C. Wickes - HP-48GX Books by Jim Donnelly - HP 50g, 49g+ and 48gII PC Connectivity Kit (also for HP-48G series)  

The HP 49G is a high end RPN/RPL/Algebraic graphing calculator made by HP. It included an algebraic mode as well as RPN. It was intended to be a more student-friendly HP graphing calculator to compete better with TI and Casio models with a blue color and rubber keys. As such it was not well received by the traditional HP calculator community. It was the first HP calculator with upgradable firmware in Flash memory. The HP 49G was produced from 1999 to 2003. Compared to earlier models, all HP 49g units had a high contrast LCD. It is also available as an emulation under Windows, IOS and Android.

Links: HP 49G Documentation (English) - HP 49G Apps and Documentation - HP 49G Wikipedia page - HP 49G at MyCalcDB - HP 49G at HPDATAbase - HP 49G - Meta Kernel, Erable and ALG48 (CC video) - Hewlett Packard HP-49G, G+, HP-50G - HPComm Link Software - HP 49G FAQ, Miscellaneous HP 49/50 Documentation Files - HP 49G/49g+ Tools - Marathon Tutorials (49g/50g) - HP 50g, 49g+ and 48gII PC Connectivity Kit (also for HP-49G series) 

The HP 49g+ is a high end RPN/RPL/Algebraic graphing calculator made by HP as a replacement for the HP 49g. It used an ARM processor with an emulation layer for the older Saturn processors found in previous HP calculators. The HP 49g+ was produced from 2003 to 2006.  It is also available as an emulation under Windows, IOS and Android.

Links: HP 49g+ Documentation (English) - HP 49g+ Wikipedia page -HP 49g+ Apps and Documentation HP 49g+ at HPDATAbase - The Baby 50G AKA HP 48gII (video) - HP 49g+ How To Solve Quadratic Equations (video) - Hewlett Packard HP-49G, G+, HP-50G - HPComm Link Software, Miscellaneous HP 49/50 Documentation Files, HP 49G+ keyboard answers - HP 49G keyboard not working FIXED, calculator disassembly and repair (video) - HP49G repairs - HP 49G/49g+ Tools - An Introduction to Programming HP Graphing Calculators - Marathon Tutorials (49g/50g) - HP 50g, 49g+ and 48gII PC Connectivity Kit 

The HP 48gII is a high end RPN/RPL/Algebraic graphing calculator made by HP as a lower cost option to the HP 49g+. The HP 48gII was produced from 2003 to 2008.   It is also available as an emulation under Windows and Android.

Links: HP 48gII Documentation (English) - HP 48gii Apps and Documentation - HP 48gII Wikipedia page - HP 48gII at HPDATAbase - HP 48gII Mini Review VS HP 49g+ - Hewlett Packard HP-48S, SX, G, G+, GX, GII, Miscellaneous HP 49/50 Documentation Files - An Introduction to Programming HP Graphing Calculators - HP 50g, 49g+ and 48gII PC Connectivity Kit  

The HP 50g is a high end RPN/RPL/Algebraic graphing calculator made by HP as a replacement for the HP 49g+. It uses the same ARM processor and firmware as the HP 49g+. The HP 50g was produced from 2006 to 2015.   It is also available as an emulation under Windows, IOS and Android.

Links: HP 50g Documentation (English) - HP 50g Wikipedia page - HP 50g Apps and Documentation - HP 50g at HPDATAbase - HP 50g Resources - HP 50G Graphing Calculator Review (CC video) - HP 50g Calculator Teardown & Repair [SD card] (video) - HP-50g A Tutorial for Engineering Students (20 videos) - The Unicum Guide to HP 50g (video) - HP 50G System RPL / SysRPL Configure and Test Step by Step (video) - HP 50G (3 videos) - HP 50g Solving differential equations - Hewlett Packard HP-49G, G+, HP-50G - HP 50g LCD issues (forum post) - HP 50g Tutorial (35 separate lessons) - HP 50g Tutorial (35 lessons in one PDF), Miscellaneous HP 49/50 Documentation Files, HP 50g AUR Appendix C - Flags - HP 50g and missed keypresses - How to Solve Any System of Equations with the HP-50G (video) - HP Prime (15 videos) - HP 49G/49g+ Tools - An Introduction to Programming HP Graphing Calculators - Differential Equation on the HP 50g - Complex Numbers and Trigonometry - Fred's HP 50g Calculator Info (many links) - HP 50G Basic Course (12 videos subtitled) - HP 50g Learning Modules (56 PDFs in a Zip) - Marathon Tutorials (49g/50g) - HP 50g unit conversion using RPN (video) - hp 50g/hp 49g+/hp 48gii tutorial course at USU - HP-50G Tutorials - Solving systems of equations on the HP 50G - HP 50g Examples - HP 50g Self Tests - Tri-graphs - 50G Solver - Use softkeys? - HP50g small tips and trick - Programming with HP50g - (48g) (49g) (50g) Rectangular to Polar Coordinate Conversion [RPL] - HP50G Menus - HP 50g--too shifty? - LongFloat Library - Keyman - HP 50g System Flags - HP 50g Keyboard Shortcuts - HP 50g Menu-Number Table - HP 50g Command Menu-Path Table - HP 50g, 49g+ and 48gII PC Connectivity Kit - How to Connect an HP-50G to a Windows 10/11 PC (video) 

The HP Prime is a high end RPN/RPL/Algebraic graphing calculator made by HP. It features a color touchscreen and an advanced Computer Algebra System (CAS) based on Xcas. The HP Prime has been in production since 2013. In 2018 a G2 version of the Prime entered production with a faster CPU and more RAM/Flash memory.  It is also available as an emulation under Windows, IOS and Android.

Links: HP Prime Documentation (English) - HP Prime software downloads from HP Moravia (including emulators) - HP Prime Apps and Documentation - HP Prime Wikipedia page - HP Prime Resources - HP Prime Portal - HP Prime Forum - HP Prime Graphing Calculator Review (CC video) - MoHPC HP Prime Software Library - HP Prime Calculator Review with 28S, 48GX & 50g (video) - My HP Prime G2 review - My HP Prime G2 Long Term Review (video) - HP Prime vs TI-nspire CX II CAS | Review and Comparison (video) - HP Prime Tutorials (15 videos) - Technology in College Algebra - HP Prime (42 videos) - HP Prime Geometry App Tutorial (series) - HP-Prime: Documentation & Tutorials (forum post) - HP Prime - HP Prime for All - HP Prime Programming - HP Prime Python Libraries (list) - HP Prime (G1) Internal Photos - Updated Prime keyboard colors - HP Prime Programming Tutorial - Eddie's Math and Calculator Blog (HP Prime) - Base48: an application inspired by the 48GX Base functions - Units48 v1.0: units the 48 way - HP Prime Programming: An Introduction - HP Prime Polar Mode - Prime G2 screen refresh rate - HP Prime Intro (6 videos) - HP Prime (15 videos) - Symbolic computation and Mathematics with the calculator HP Prime (PDF) - Programming in HP PPL - Prime Graphing Calculator does not work unplugged - HP Prime user keys - HP Prime - On calc help, commands and full help tree in PDF form - Request for help with CSS/Html formatted On-Calc Doc - A way to improve the physical screen? - HP Prime and Graphing Calculator sales information - Equation Library - Equation Library and Nonlinear Systems Solver - Shortcut to Convert Units (video) - Python Activities Book HP Prime

DB48X for the DM42 - The DB48X project intends to rebuild and improve the user experience of the HP48 family of calculators, notably their "Reverse Polish Lisp" (RPL) language with its rich set of data types and built-in functions, and Lisp-level programming power. The DB48X project aims to develop an HP48-like calculator environment on the SwissMicros DM42 and DM32. There is also a simulator that is tested on macOS or Linux, a Web browser simulation and 3 IOS Apps. Be sure to look at the ReadMe section and the curent Help File for more information. The author, Christophe de Dinechin, has a YouTube site which has demos made during its development as well a a playlist of DB48X videos. Here is a bit of his history with HP calculators. More information can also be found on this SwissMicros forum post: Announcing DB48X, RPL for DM42, on this Museum of HP Calculators forum post: DB48X: HP48-like RPL implementation for DM42 and at the DB48X-on-DM42 Github repository. The version release notes can be found here. Also see the DB48X Documentation and Tutorial section. Overlay labels are available at this forum post (see photo of this label on a DM42 here). The long video demo of V0.7.0 introduces many new features such as graphical rendering of equations, date and time operations, and a few other things. See here for the most recent videos. DB48X can now be run in a web browser. This allows DB48X to run on just about any computer or mobile Web browser. DB48X is now available as a native IOS app. It is available in 3 versions, DB40X, DB48X and DB50X.

Links: DB48X Project Site - DB48X for the DM42 - DB48X ReadMe - DB48X Help File - DB48X video playlist - DB48X Web Browser Emulation - DB48X: HP48-like RPL implementation for DM42 - Announcing DB48X, RPL for DM42 - IOS Store Apps - DB48X - Reviving the spirit of HP calculators (video) - DB48X Documentation and Tutorial - Help File - Installing DB48x