Home › Utilities
US
1 of 1 storefronts
Content in en-US
Content in en-US
Information
Preview 2 platforms
iPhone 6 images
iPad 6 images
What’s New Version 1.3.15
Fixed RLN and RRN for negative numbers in BSIGNED mode.
Description
Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was made from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and contains no HP code whatsoever.
Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached units and unit conversions modeled after those used on the HP-48/49/50 series; directories for more organized storage of programs and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the user may resize at will; time value of money and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and find integrals and roots from points in the plot.
Accessibility
ipadiphonemacrealityDevicetvoswatch
Version history 25 versions
Build 885258003v1.3.152026-05-05 00:47:40
Fixed RLN and RRN for negative numbers in BSIGNED mode.
Build 884757617v1.3.142026-04-22 00:27:52
Fixed crash in REFMOVE.
More accurate GAMMA for integer arguments.
Build 881469539v1.3.132026-01-14 09:37:28
Fixed potential crash in VARMENU.
Build 879295510v1.3.122025-10-29 08:52:45
Fixed crash in menu logic.
Build 878963105v1.3.112025-10-16 14:20:27
Fixed crash in EQN->R/S when EQNS does not yet exist.
When a new program was created by inserting END, the new program could end up being locked initially. Fixed.
Build 876096223v1.3.102025-07-03 10:31:31
Fixed a couple of rare crashes.
Build 875983077v1.3.92025-06-30 09:45:00
Applying units in PRGM mode didn't work when the RPN stack was empty. Fixed.
Build 875361093v1.3.82025-06-05 23:10:45
Fixed potential crash on app restart.
Build 875292947v1.3.7c2025-06-04 07:45:08
Fix for unreliable state file saving.
Build 875179013v1.3.7a2025-06-01 08:20:40
Now hiding shadowed labels from MVAR catalogs.
Fix for certain rare crashes.
Build 874943563v1.3.62025-05-21 17:35:36
Better handling of ACC=0 in INTEG.
More accurate C.E^X-1.
Build 874713604v1.3.52025-05-13 13:07:21
Fixed a couple of equation editor bugs.
Build 874549619v1.3.42025-05-06 14:58:31
Fixed handling of shared matrices in PUTMI.
Fixed handling of subnormal complex numbers in 1/X.
Added SLN, SRN, and ASRN to CATALOG->BASE.
Added current base to the BASE mode status indicators, and made the indicators more compact.
Fixed skin key highlighting for hardware keyboard keystrokes, when using certain skins with complicated key mappings.
Fixed potential crash when loading state.
Build 874398839v1.3.32025-04-29 20:00:58
BASE menu: Implemented SLN, SRN, and ASRN. These functions are can be typed as Shift-SL, Shift-SR, and Shift-ASR, respectively, and RJ can now be typed as Shift-LJ.
More accurate DET, INVRT, and matrix division for 2x2 matrices.
When spelling out built-in function names, '-' is now accepted as an alternative for '→', to make conversion functions easier to type.
Menu keys that execute different functions when pressed with Shift now show their alternate function while Shift is active. (This behavior can be disabled and enabled using the new STATIC and DYNAMIC settings in the new MENUS submenu of the MODES menu.)
Decimal version: BS→N and BD→N were rounding their results to 16 digits. Fixed.
Build 874287376v1.3.12025-04-25 07:34:33
BASE enhancements: shift and rotate functions, bit manipulation functions, floating-point conversions, and optional digit grouping. See the Free42 web site for all the details.
(1.3.1) BASE: Fixed DECINT behavior for -2^(WSIZE-1).
Build 874302198v1.3.22025-04-25 15:54:22
(1.3) BASE enhancements: shift and rotate functions, bit manipulation functions, floating-point conversions, and optional digit grouping. See the Free42 web site for all the details.
(1.3.1) BASE: Fixed DECINT behavior for -2^(WSIZE-1).
(1.3.2) RLN, RRN, RLCN, and RRCN did not drop the stack. Fixed.
(1.3.2) Fixed a couple of bugs in the equation editor.
Build 874243071v1.32025-04-24 07:08:39
BASE enhancements: shift and rotate functions, bit manipulation functions, floating-point conversions, and optional digit grouping. See the Free42 web site for all the details.
Build 874156727v1.2.8a2025-04-19 22:07:38
NEWEQN and EDITEQN functions (EQN.FCN menu). These create or edit equations and strings in place, in the stack and in programs, without needing to go through EQN mode.
Moved equation settings from MODES to EQN.FCN, and moved BASE settings from MODES to BASE, to make them easier to find and to declutter the MODES menu.
(1.2.8a) Fixed pop-up keyboard behavior with dialogs in the equation editor.
Build 874144544v1.2.82025-04-18 21:20:30
NEWEQN and EDITEQN functions (EQN.FCN menu). These create or edit equations and strings in place, in the stack and in programs, without needing to go through EQN mode.
Moved equation settings from MODES to EQN.FCN, and moved BASE settings from MODES to BASE, to make them easier to find and to declutter the MODES menu.
Build 873937521v1.2.72025-04-10 23:18:07
Fixed crash in RCOMPLX/PCOMPLX when the stack is empty (NSTK mode).
More accurate integer powers of complex numbers. Specifically: special cases for pure real, pure imaginary, and numbers of the form a+ai and a-ai.
Fixed VIEW for long values.
Added XSTR option for EQN→STO→X and EQN→STO→PRGM.
The file selector wasn't sorting the directory listing. Fixed.
Build 872608224v1.2.62025-02-19 06:00:02
Fixed crash when saving an equation without having modified it. This bug was introduced in the previous release.
Improvements in error handling when evaluating equations.
Build 872541832v1.2.52025-02-17 01:40:06
SOLVER and ∫f(x) now allow selecting programs outside the current directory.
Equation lines were being truncated to a maximum 100 of characters when they were displayed or printed. Fixed.
Implemented Swipe to Delete in the file selector dialog.
Build 872501042v1.2.42025-02-14 18:54:29
Equations can now be embedded in programs, using X2LINE or EQN→STO→PRGM. Equation lines can be plain, which means they push the equation object onto the stack, or they can be EVAL lines, which evaluate the equation in place. Equation lines can be toggled between plain and EVAL lines using the EVAL function in PRGM mode.
The CUSTOM menu didn't stick reliably, due to a bug introduced in 1.2. Fixed.
Build 872331405v1.2.32025-02-08 17:14:22
Fixed crash when trying to load invalid skins.
Added IDENT function. This returns the app's version number as a negative integer, in -aabbccdd format, with 1.2.3f formatted as -1020306, for example. The number is negative in order to distinguish Plus42 from Free42, which returns positive numbers from IDENT.
XROMs are now decoded immediately when pasting.
Switched ^ and ↑ in the character set. The change is transparent to the user, but it restores code compatibility with the encoding of ↑ in Free42.
Build 872040181v1.2.22025-01-27 11:52:21
User-defined units with SI prefixes didn't work in the CUSTOM menu. Fixed.
Price history by region
Currency
Show
Columns
Search
Availability 1 of 1 storefronts
| Region | Language | Price | Ratings | Avg | Version |
|---|---|---|---|---|---|
| US | en-US | USD 9.99 | 78 | 4.9 | 1.3.15 |
Change log 29 changes · US
✎
releaseNotes updated
Fixed RLN and RRN for negative numbers in BSIGNED mode.
✎
description updated
Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmabl
✎
subtitle updated
Enhanced HP-42S Calc Simulator
✎
name updated
Plus42
◆
Version 1.3.15 released
Fixed RLN and RRN for negative numbers in BSIGNED mode.
◆
Version 1.3.14 released
Fixed crash in REFMOVE.
More accurate GAMMA for integer arguments.
◆
Version 1.3.13 released
Fixed potential crash in VARMENU.
◆
Version 1.3.12 released
Fixed crash in menu logic.
◆
Version 1.3.11 released
Fixed crash in EQN->R/S when EQNS does not yet exist.
When a new program was created by inserting END, the new program could end up being locked initially. Fixed.
◆
Version 1.3.10 released
Fixed a couple of rare crashes.
◆
Version 1.3.9 released
Applying units in PRGM mode didn't work when the RPN stack was empty. Fixed.
◆
Version 1.3.8 released
Fixed potential crash on app restart.
◆
Version 1.3.7c released
Fix for unreliable state file saving.
◆
Version 1.3.7a released
Now hiding shadowed labels from MVAR catalogs.
Fix for certain rare crashes.
◆
Version 1.3.6 released
Better handling of ACC=0 in INTEG.
More accurate C.E^X-1.
◆
Version 1.3.5 released
Fixed a couple of equation editor bugs.
◆
Version 1.3.4 released
Fixed handling of shared matrices in PUTMI.
Fixed handling of subnormal complex numbers in 1/X.
Added SLN, SRN, and ASRN to CATALOG->BASE.
Added current base to the BASE mode status indicators, and made the indicators more compact.
Fixe
◆
Version 1.3.3 released
BASE menu: Implemented SLN, SRN, and ASRN. These functions are can be typed as Shift-SL, Shift-SR, and Shift-ASR, respectively, and RJ can now be typed as Shift-LJ.
More accurate DET, INVRT, and matrix division for 2x2 matrices.
When spel
◆
Version 1.3.2 released
(1.3) BASE enhancements: shift and rotate functions, bit manipulation functions, floating-point conversions, and optional digit grouping. See the Free42 web site for all the details.
(1.3.1) BASE: Fixed DECINT behavior for -2^(WSIZE-1).
(
◆
Version 1.3.1 released
BASE enhancements: shift and rotate functions, bit manipulation functions, floating-point conversions, and optional digit grouping. See the Free42 web site for all the details.
(1.3.1) BASE: Fixed DECINT behavior for -2^(WSIZE-1).
◆
Version 1.3 released
BASE enhancements: shift and rotate functions, bit manipulation functions, floating-point conversions, and optional digit grouping. See the Free42 web site for all the details.
◆
Version 1.2.8a released
NEWEQN and EDITEQN functions (EQN.FCN menu). These create or edit equations and strings in place, in the stack and in programs, without needing to go through EQN mode.
Moved equation settings from MODES to EQN.FCN, and moved BASE settings
◆
Version 1.2.8 released
NEWEQN and EDITEQN functions (EQN.FCN menu). These create or edit equations and strings in place, in the stack and in programs, without needing to go through EQN mode.
Moved equation settings from MODES to EQN.FCN, and moved BASE settings
◆
Version 1.2.7 released
Fixed crash in RCOMPLX/PCOMPLX when the stack is empty (NSTK mode).
More accurate integer powers of complex numbers. Specifically: special cases for pure real, pure imaginary, and numbers of the form a+ai and a-ai.
Fixed VIEW for long val
◆
Version 1.2.6 released
Fixed crash when saving an equation without having modified it. This bug was introduced in the previous release.
Improvements in error handling when evaluating equations.
◆
Version 1.2.5 released
SOLVER and ∫f(x) now allow selecting programs outside the current directory.
Equation lines were being truncated to a maximum 100 of characters when they were displayed or printed. Fixed.
Implemented Swipe to Delete in the file selector d
◆
Version 1.2.4 released
Equations can now be embedded in programs, using X2LINE or EQN→STO→PRGM. Equation lines can be plain, which means they push the equation object onto the stack, or they can be EVAL lines, which evaluate the equation in place. Equation lines
◆
Version 1.2.3 released
Fixed crash when trying to load invalid skins.
Added IDENT function. This returns the app's version number as a negative integer, in -aabbccdd format, with 1.2.3f formatted as -1020306, for example. The number is negative in order to disti
◆
Version 1.2.2 released
User-defined units with SI prefixes didn't work in the CUSTOM menu. Fixed.