Takes an algebraic expression and converts it to an RPN string. The program itself may not be all that useful but it hopefully provides to those interested in programming expressions a bit of insight into how expressions are built.
Tetris-like puzzle. It takes place inside a tall, rectangular playing area. Columns of three different symbols (such as differently-colored jewels) appear, one at a time, at the top of the well and fall to the bottom, landing either on the floor or on top of previously-fallen "Columns".
Creates 2D contours using the Advanced Graphing app. The user's current formulas are kept safe, and are restored after the contours are drawn. I had hoped to incorporate this into the Graph3D app, but the current implementation of startview() and how apps handle built-in applications are currently preventing this from happening.
This is an example of how to implement one's own prologue. This specific example shows how to implement a prologue that behaves like a ROMPTR. It requires that the matching ROMPTR contains a BZ-compressed string object, and will automatically decompress and execute the object, even from covered memory banks. Make sure to store the library in Port 0!
Equivalent to WIREFRAME plot, but with hidden line removal and shading of "underside" of 3D graph. For the 49g+ and 50g (ROM 2.15) only. The previous version only worked on older ROM revisions (older 49G ROMs only?). Modified to work with most current ROM. Source code has been updated as well (for on-calc compiling only).
Contains documentation and 45 photographs explaining how to open the HP 48 series for repair, including tips on repairing screen and keyboard problems.
Jazz for the 49g+ and 50g with ROM 2.09 or 2.15. This is a complete port of the Jazz library for the HP48 series. It includes support for new opcodes, new object types such as flash pointers, integers, minifont, etc. The library provides an assembler, disassembler, ML debugger, SysRPL debugger, an entries catalog, and an editor.
MFED is a MINIFONT editor that is only 123.5 bytes in size. It uses the built-in font editor interface. The editor transforms the MINIFONT into a 6x6 font for editing, and then crops each character bitmap down to 6x4. Tested on ROM 1.24 and 2.15.
HP Prime port of QPI 4.3 (originally for the HP 48 series). Approximates any floating point numbers by a rational number, square root, multiple of PI, exponential or a logarithm depending on which approximation seems best.
This is the System RPL Debugger that normally comes with Jazz. However, it has been compiled as a standalone library along with a modified SSTK. This has been tested on a 49g+ and a 50g with ROM 2.15. Compatible with the extable entries library that is distributed with Jazz 50g.
Takes over the [Shift][_] key and provides a super-simple units menu for facilitating unit conversion. When the user types the _ symbol via [Shift][_], a units menu is automatically shown (and if applicable, the last menu used will be displayed). The first menu is the category, and the second menu is the list of units within that category.
Computes the singular value decomposition of a matrix. It additionally provides the commands diag2 (diagonal), pinv (pseudo-inverse), qrp (permutation/unitary/upper triangular), and lqp (permutation/unitary/lower triangular).
Intended to replicate and combine programs from the HP 48 series of calculators for organizing equations and launching an equation solver. This app attempts to allow users to build their own equations library. The user can then also launch a numerical solver. This app implements the Newton-Raphson algorithm for solving a system of equations. In order to handle ill-conditioned, over-determined, under-determined, rank-deficient (etc.) Jacobian matrices, the SVD is used to determine the pseudo-inverse of the Jacobian (the pseudo-inverse coincides with the regular inverse of a matrix for non-singular matrices). Includes a copy of the equation library from the HP 48/49 series to get you started, including all the graphics. Also includes a more accurate version that requires Singular Value Decomposition.
TED is the editor from Jazz. T his is a modified version of the editor from v1.11 of Jazz 50g. It comes with two commands: TED and VV (the string/grob viewer from Jazz). For the 49g+ and 50g with ROM 2.15. Source code is included.
Performs base conversions, including fractional parts.
Introduces calculus to beginning calculus students. Includes graphical tutorials.
Tetris-like puzzle. It takes place inside a tall, rectangular playing area. Columns of three different symbols (such as differently-colored jewels) appear, one at a time, at the top of the well and fall to the bottom, landing either on the floor or on top of previously-fallen "Columns".
Pair of programs that do complex number plotting.
Powerful 3D graphing application. Includes rotation and tracing, with touchscreen gestures for rotation, zooming, and panning.
Equivalent to WIREFRAME plot, but with hidden line removal and shading of "underside" of 3D graph. For the 49g+ and 50g (ROM 2.15) only. The previous version only worked on older ROM revisions (older 49G ROMs only?). Modified to work with most current ROM. Source code has been updated as well (for on-calc compiling only).
Jazz for the 49g+ and 50g with ROM 2.09 or 2.15. This is a complete port of the Jazz library for the HP48 series. It includes support for new opcodes, new object types such as flash pointers, integers, minifont, etc. The library provides an assembler, disassembler, ML debugger, SysRPL debugger, an entries catalog, and an editor. 
Another Mandelbrot plotter, written in System RPL. Includes source code.
MFED is a MINIFONT editor that is only 123.5 bytes in size. It uses the built-in font editor interface. The editor transforms the MINIFONT into a 6x6 font for editing, and then crops each character bitmap down to 6x4. Tested on ROM 1.24 and 2.15.
This is the System RPL Debugger that normally comes with Jazz. However, it has been compiled as a standalone library along with a modified SSTK. This has been tested on a 49g+ and a 50g with ROM 2.15. Compatible with the extable entries library that is distributed with Jazz 50g.
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Intended to replicate and combine programs from the HP 48 series of calculators for organizing equations and launching an equation solver. This app attempts to allow users to build their own equations library. The user can then also launch a numerical solver. This app implements the Newton-Raphson algorithm for solving a system of equations. In order to handle ill-conditioned, over-determined, under-determined, rank-deficient (etc.) Jacobian matrices, the SVD is used to determine the pseudo-inverse of the Jacobian (the pseudo-inverse coincides with the regular inverse of a matrix for non-singular matrices). Includes a copy of the equation library from the HP 48/49 series to get you started, including all the graphics. Also includes a more accurate version that requires 
TED is the editor from Jazz. T his is a modified version of the editor from v1.11 of Jazz 50g. It comes with two commands: TED and VV (the string/grob viewer from Jazz). For the 49g+ and 50g with ROM 2.15. Source code is included.