db48x/STATUS.md

System and user interface

• Functional graphical simulator for the DMCP platform
• Test suite on simulator
• Main calculator loop, on/off, accessing DMCP Setup menu
• RPL-style command-line text editor
• Key processing
• DM42-adapted shift logic
• Virtual annunciators
• Alpha mode and lowercases
• Garbage collector
• Low-memory stress testing
• Built-in commands lookup and parsing
• Soft menus navigation
• Global variables
• Local variables
• Home directory and subdirectories
• Variables menu accessible with RCL key
• Complete interactive catalog of available functions
• RPL program evaluattion
• RPL program single-stepping / debugging
• Stack undo / redo
• Accelerated blitter code with 8x8 patterns
• Unicode-capable text drawing replacement
• Unicode / UTF-8 support
• Unicode fonts (e.g. derived from WP43S project)
• Larger font for editor (old geezer mode)
• Objects in USB-accessible flash storage
• Calculator state load/save
• Global help from generated markdown file
• Per-function help from markdown files
• Character menu / table
• Brezenham lines, circles and ellipses
• Polygon fill
• RPL-controlled soft-menu system
• Domain-specific features / customizaton from files on USB disk
• Single-key object format cycling
• Units and conversion customization from units.csv file

Object system

• Object system with compact storage and dynamic dispatch
• Stack management
• Convenient allocation, initialization and recycling of temporaries
• Object evaluation
• Object parsing
• Object text rendering
• Object graphical rendering
• Object graphical editor
• Errors and error display
• Error trapping / handling, e.g DOERR.

RPL data types

• Built-in commands (e.g. Neg)
• Integer data type, e.g. 123
• Hexadecimal (#123h), decimal (#123d), octal (#123o) and binary (#1001b) based numbers
• Based integers (arbitrary base between 2 and 36, e.g. 13#10231AC)
• Arbitrary-size integers e.g. 123456789012345678901234567890
• Fractions, e.g. 1/7
• [x[ Fraction formats, e.g. 22/7 vs 3 1/7 vs. 3,1428571429
• Decimal floating-point with fixed size (32, 64 and 128 bits)
• Decimal floating-point with arbitrary size
• Binary floating-point with arbitrary size
• Hardware-accelerated 32-bit binary floating-point
• Text / strings, e.g. "ABC"
• Name / symbols, e.g. ABC
• Complex numbers in rectangular form, e.g. 2 + 3i
• Complex numbers in polar form, e.g. 2 ∡ 30°
• Quaternions
• Intervals / ranges, e.g. 1..5
• Angles, e.g. ∡30°
• Lists, e.g. { A 1 "Hello" }
• Arrays, vectors, matrices and tensors, e.g. [ [ 1 2 3] [ 4 5 6] ]
• Program objects, e.g « IF 1 = THEN "Equal to one" END »
• Algebraic programs, e.g. 'if x = 1 then "Equal to one" based on XL-style parser
• Bitmaps, e.g. GROB 8 8 00000000000000FF
• Fonts, e.g. FONT 000000
• Vector graphics
• Tagged objects
• Algebraic expressions
• Unit objects
• Directories
• Software libraries
• Keymaps
• Softkey menus
• Full-screen menus
• Forms
• Object handler (can replace eval, parse, render, graphical editor)
• HP41/HP42-style key-entry program
• ARM PIC code

Basic Arithmetic

• Integer arithmetic
• Floating-point arithmetic
• Detection of precise vs. imprecise results, like newRPL
• Automatic integer to floating-point promotion
• Automatic selection of entered floating-point size based on user input
• Automatic selection of computed floating-point size based on Precision
• Fraction arithmetic
• Automatic fraction promotion
• Correct rounding (a la crlibm)
• Range arithmetic

Computations on real numbers

• Floating-point arithmetic
• Circular functions, e.g. sin, cos, atan, ...
• Exponentials and logarithms, e.g. exp, ln, ...
• Hyperbolic functions, e.g. sinh, atanh, ...
• Probabilities functions, like Factorial, Combinations, etc.
• Statistics functions, like Σ+, Mean or Median
• Special functions, like Bessel, FastFourierTransforma, etc
• Constant tables with arbitrary precision from files on USB disk
• Equation tables with explanatory graphics from files on USB disk
• Unit conversions

Computations on complex numbers

• Complex arithmetic
• Circular functions, e.g. sin, cos, atan, ...
• Exponentials and logarithms, e.g. exp, ln, ...
• Hyperbolic functions, e.g. sinh, atanh, ...
• Probabilities functions, like Factorial, Combinations, etc.
• Statistics functions, like Σ+, Mean or Median
• Special functions, like Bessel, FastFourierTransforma, etc
• Equation tables with explanatory graphics from files on USB disk

Computations on quaternions

• Arithmetic
• Circular functions, e.g. sin, cos, atan, ...
• Exponentials and logarithms, e.g. exp, ln, ...
• Hyperbolic functions, e.g. sinh, atanh, ...
• Probabilities functions, like Factorial, Combinations, etc.
• Statistics functions, like Σ+, Mean or Median
• Special functions, like Bessel, FastFourierTransforma, etc
• Equation tables with explanatory graphics from files on USB disk

Computations on vectors, matrices and tensors

• Arithmetic
• Determinant, inverse, transpose
• Eigenvalues
• Tables with special matrices, e.g. Pauli matrices, General Relativity

Computer Algebra system

• Rendering of symbolic expressions
• Parsing of symbolic expressions
• Symbolic operations
• Integrate existing CAS like GIAC
• Rules engine
• Symbolic differentiation
• Symbolic integration

Numerical evaluation

• Integration
• Root finding

Other RPL functional areas (to be expanded)

• Real-time clock
• Alarms
• File system access
• Printing
• Plotting
• Equation writer
• Matrix writer