Projects

70 open source tools, libraries, course materials, repairs, and experiments, grouped by the themes that connect them.

Theme:

p2000t-sdcard

SD-card cartridge for the Philips P2000T — hardware design plus Z80 firmware to load software from FAT32 SD cards on a 1980s home computer.

p2000t sdcard z80
C 3 Retro Computing
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p2000t-scart-connector-pcb

PCB for connecting a SCART male connector to the P2000T for clean RGBS composite video output on modern displays.

p2000t scart kicad
3 Retro Computing
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p2000t-ram-expansion-board

RAM expansion board for the P2000T, extending memory via the cartridge slot. Includes KiCad schematics and firmware.

p2000t ram hardware
C 1 Retro Computing
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p2000t-joystick-cartridge

SLOT2 cartridge to interface Atari 2600-style joysticks with the Philips P2000T — because BASIC games deserve a proper joystick.

p2000t atari-joystick
Python 1 Retro Computing
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p2000t-hf-h2

Demonstrator program that runs a Hartree-Fock calculation for the H₂ molecule on a Philips P2000T — bridging 1980s hardware with quantum chemistry.

p2000t hartree-fock quantum-chemistry
C 1 Retro Computing
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P2000T-SD-kaart-handleiding

Nederlandstalige handleiding voor de P2000T SD-kaart cartridge — a complete Dutch-language user manual in LaTeX.

p2000t documentation
TeX 1 Retro Computing
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p2000t-screenshot-creator

Python tool that generates synthetic P2000T monitor screenshots, useful for documentation and demos without needing real hardware.

p2000t python
Python 1 Retro Computing
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p2000t-power-button-fix

Homebrew kit to fix the common power-button failure on the P2000T — a practical repair guide with schematics.

p2000t repair hardware
1 Retro Computing
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p2000t-tape-monitor

Cartridge software for the P2000T that reads out tape data and copies it to an external ROM chip — a digital preservation tool.

p2000t z80 assembly
C++ Retro Computing
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p2000t-z80-ide

Integrated Desktop Environment for writing and running Z80 assembly programs on the P2000T, built in C++ with a built-in assembler.

p2000t z80 ide
C++ Retro Computing
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p2000t-rs232-cartridge

Modified P2000T BASIC cartridge that adds RS232 support for easily loading CAS tape files over a serial connection.

p2000t rs232 z80
Assembly Retro Computing
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p2000t-tape-copy-utility

Cartridge program for duplicating P2000T tape cassettes — copy data tapes without a PC.

p2000t tape
C Retro Computing
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P2000T-toolkit

Combined P2000T emulator and Z80 compiler toolkit for developing and testing software without physical hardware.

p2000t emulator z80
Assembly Retro Computing
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M2000

Portable emulator for the Philips P2000T and P2000M, supporting ROM cartridges, tape drive, sound, and the SAA5050 character generator. Runs on MS-DOS, Unix/X, and Windows.

p2000t p2000m emulator z80
C Retro Computing
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p2000m-din5-mda-interface

PCB adapter that translates the DIN5 video output of the Philips P2000M to an MDA-compatible connector for use with standard CRT monitors.

p2000m mda video-adapter kicad
Retro Computing
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p2000c-8088-assembly

Small 8088 assembly programs for the 16-bit CoPower board (P2093) of the Philips P2000C computer.

p2000c 8088 assembly copower
Assembly Retro Computing
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p2000c-bytebridge-8086

Serial file transfer utility for the Philips P2000C, allowing files to be sent from a modern PC to the CoPower board via RS232 with CRC16 verification.

p2000c 8086 serial file-transfer
Assembly Retro Computing
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p2000c-cpm-transfer

Toolset for transferring files between a modern computer and the Philips P2000C running CP/M 2.2 over a serial connection, with a custom protocol and Python automation.

p2000c cpm serial z80
Python Retro Computing
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ibm5150-memory-expansion-256-640

ISA memory expansion card for the IBM 5150, extending conventional RAM from 256 KiB to 640 KiB using the machine's expansion slots.

ibm5150 isa-card memory-expansion kicad
Retro Computing
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isa-option-rom-card

8-bit ISA card carrying an SST39SF010 flash ROM organised into four 32 KiB banks, designed to act as a legacy BIOS Option ROM during POST.

isa-card option-rom bios kicad
Retro Computing
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isa-post-card

Diagnostic POST card for XT-class ISA systems — reads and displays BIOS POST codes to help troubleshoot vintage PC hardware.

isa-card post-card diagnostics ibm-pc
Retro Computing
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8087-asm-math

Assembly examples demonstrating the Intel 8087 FPU in real-mode MS-DOS — FSIN, FCOS, and arithmetic operations tested on a real IBM 5150.

8087 8086 assembly ms-dos fpu
Assembly Retro Computing
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dos-8086-assembly-demos

Reference collection of small 8086 MS-DOS assembly programs: VGA color grids, file I/O, image display, CRC16, and more.

8086 assembly ms-dos dos
Assembly Retro Computing
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hf4msdos

Hartree-Fock quantum chemistry calculator compiled for MS-DOS with Borland C++, tested on an IBM 5150 with 256 KiB of memory and an 8087 FPU.

ms-dos ibm5150 hartree-fock quantum-chemistry
C Retro Computing
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c64-megacart

Multi-cartridge board for the Commodore 64 using an SST39SF040 flash ROM, allowing multiple C64 programs to be stored on and launched from a single cartridge.

c64 commodore64 cartridge flash-rom
Retro Computing
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dftcxx

C++ DFT program for educational purposes. Implements density functional theory from the ground up with a focus on clarity and correctness.

dft quantum-chemistry electron-density
C++ 63 Computational Chemistry
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pyqint

Python package for calculating one- and two-electron integrals using Gaussian-type orbitals. Foundation for many quantum chemistry workflows.

hartree-fock gaussian-type-orbitals molecular-integrals quantum-chemistry
Python 58 Computational Chemistry
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edp

Electron Density Plotter — render VASP CHGCAR/LOCPOT electron density maps as publication-quality images with flexible color schemes.

electron-density vasp visualization
C++ 40 Scientific Visualization
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hfcxx

Restricted Hartree-Fock program in C++ using Gaussian-type orbitals. Computes energies and electron densities for small molecules.

hartree-fock quantum-chemistry electron-density
C++ 34 Computational Chemistry
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pypwdft

Python plane-wave density functional theory code for educational purposes, accompanying lecture notes on plane-wave DFT.

density-functional-theory planewave-basis electronic-structure
Python 33 Computational Chemistry
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pydft

Localized-orbital DFT in pure Python — implements the full SCF procedure with Gaussian-type orbitals, designed for teaching and exploration.

density-functional-theory gaussian-type-orbitals quantum-chemistry
Python 20 Computational Chemistry
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sphecerix

Rotation of spherical harmonics using Wigner-D matrices — an essential building block for angular momentum theory in quantum chemistry.

spherical-harmonics wigner-d-matrix
Python 17 Computational Chemistry
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den2obj

Converts VASP density files (CHGCAR/LOCPOT) to mesh isosurfaces via the marching cubes algorithm — outputs Wavefront OBJ or OpenVDB.

isosurface marching-cubes electron-density vasp
C++ 14 Scientific Visualization
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wavefuse

Gray-Scott reaction-diffusion system simulated in 3D using CUDA. Generates intricate Turing-like chemical patterns at GPU speed.

cuda gray-scott-model reaction-diffusion finite-difference
C 12 Computational Chemistry
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turing

C++ implementation of Turing pattern generation via reaction-diffusion equations — a clean model of biological morphogenesis.

reaction-diffusion turing-patterns simulation
C++ 11 Computational Chemistry
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pylebedev

Python library for Lebedev quadrature points and weights on the unit sphere — used for accurate numerical integration in quantum chemistry.

lebedev quadrature unit-sphere
Python 9 Computational Chemistry
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pytessel

Python package for tessellating 3D scalar fields into isosurfaces using the marching cubes algorithm. Fast C++ backend, Python interface.

isosurface marching-cubes tesselation
C++ 5 Scientific Visualization
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bramble

Common Neighbor Analysis tool for identifying crystal structure environments in molecular dynamics trajectories.

cna common-neighbor-analysis materials-science
GLSL 4 Scientific Visualization
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den2bin

Converts VASP CHGCAR/LOCPOT density files to compact binary format for faster downstream processing and visualization.

electron-density vasp
C++ 4 Scientific Visualization
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atom-architect

Visualization and building tool for electronic structure calculations — reads VASP POSCAR/OUTCAR files and renders atomic structures in 3D.

vasp visualization materials-modelling
C++ 3 Scientific Visualization
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pymodia

Python package for visualizing molecular orbital diagrams — generate publication-ready MO diagrams from electronic structure data.

molecular-orbital mo-diagram quantum-chemistry
Python 3 Scientific Visualization
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managlyph

Stereographic rendering program for atomic systems — generate red-cyan anaglyph images of molecules and crystal surfaces.

3d-graphics anaglyph-image molecular-modeling
C++ 1 Scientific Visualization
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lafluxxy

Simulation environment for reaction-diffusion processes in maze geometries — explores how chemical patterns form within constrained spaces.

reaction-diffusion simulation
C++ Computational Chemistry
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lennard-jones-live-simulator

Interactive live Lennard-Jones molecular dynamics simulator for educational purposes. Watch particles self-organize in real time.

lennard-jones molecular-dynamics simulation
C++ Computational Chemistry
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opengl-cpp-course

Full course on writing OpenGL programs in C++ — from hello triangle to advanced lighting and shaders. Runs on Windows with GLFW.

opengl glsl graphics-programming course
C++ 34 Open Education
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pwdft-lecture-notes

Comprehensive LaTeX lecture notes on plane-wave density functional theory — from Bloch's theorem to pseudopotentials and PAW.

plane-wave-dft lecture-notes
TeX 7 Open Education
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hfhsl2021

Hartree-Fock workshop exercises for the Han-sur-Lesse Winterschool 2021 — Python notebooks walking through HF theory step by step.

hartree-fock electronic-structure workshop
Python 7 Open Education
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hfhsl

Hartree-Fock course materials for the Han-sur-Lesse Winterschool 2017 — C++ implementation with exercises.

hartree-fock course
C++ 7 Open Education
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hsl-pwdft-exercises

Plane-wave DFT exercises for the Han-sur-Lesse Winterschool 2024 — hands-on Python notebooks for the accompanying lecture notes.

plane-wave-dft workshop exercises
Python 1 Open Education
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electronic-structure-interactive-notebooks

Interactive Jupyter notebooks demonstrating electronic structure calculations from Elements of Electronic Structure Theory.

electronic-structure jupyter interactive
Jupyter Notebook Open Education
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pypractice

Gamified, browser-based Python learning app where students solve exercises, run code with Pyodide, earn XP, and unlock achievements — entirely client-side.

python-education pyodide gamification
JavaScript Open Education
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pico-sst39sf0x0-programmer

Raspberry Pi Pico-based flasher utility for SST39SF0x0 EEPROM chips — flash ROMs for retro computers without specialist hardware.

eeprom-programmer raspberry-pi-pico sst39sf040
C++ 12 Homebrew Hardware
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bytecradle-6502

Homebrew 65C02-based single board computer — complete hardware schematics, memory map, and assembly firmware built from scratch.

6502 65c02 single-board-computer
Assembly 5 Homebrew Hardware
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gameboy-cartridge-reader

ATmega 32u4-based Game Boy cartridge reader — dump ROM and RAM from original Game Boy, Color, and flash cartridges over USB.

gameboy gameboy-color cartridge-reader
C 2 Retro Computing
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sap-smd

Modular 8-bit SAP (Simple as Possible) computer built entirely with TTL logic chips — a Ben Eater-inspired homebrew CPU in SMD form.

homebrew-computer ttl-computer ben-eaters-cpu
Python 2 Homebrew Hardware
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cx16-kakuro

Kakuro logic puzzle game for the Commander X16 retro computer. Written in C with a clean text-mode UI.

cx16 retrogame kakuro
C 2 Homebrew Hardware
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cx16-othello

Othello (reversi) game for the Commander X16 — a faithful port of the classic strategy game with a computer opponent.

cx16 retrogame othello
C 2 Homebrew Hardware
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mmk

Mini Matrix Keyboard — a compact mechanical keyboard built around an STM32 microcontroller with custom PCB design.

mechanical-keyboard microcontroller pcb
C++ 2 Homebrew Hardware
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picobeam

Compact VGA text display generator for the Raspberry Pi Pico 2 — outputs 80×30 text at VGA resolution using PIO state machines.

raspberry-pi-pico-2 vga picovga
C 1 Homebrew Hardware
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atari-2600-composite-video-mod

Small PCB module to output clean composite video from an Atari 2600, replacing the aging RF modulator.

atari-2600 composite-video mod
1 Homebrew Hardware
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zeta-80

Single board computer designed around the Zilog Z80 processor — full hardware design with schematics and firmware.

z80 single-board-computer homebrew
Homebrew Hardware
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morseboard-8088

Single board computer built around the Intel 8088 processor — minimalist design with 8088 assembly firmware.

8088 intel-8088 single-board-computer
Assembly Homebrew Hardware
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bytecradle-6502-operating-system

Operating system for the ByteCradle 6502 Mini — provides a basic shell, memory management, and I/O drivers.

6502 65c02 operating-system
Assembly Homebrew Hardware
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slot-otter

8-bit ISA card to interface with a FAT32-formatted SD card — adds mass storage to vintage ISA-bus systems.

isa-card sdcard fat32
Assembly Homebrew Hardware
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nex-lang

A minimal, imperative, block-structured, dynamically typed programming language implemented in Python — with a lexer, parser, and tree-walking interpreter.

interpreter programming-language lexer parser
Python Languages and Tools
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plat-lang

Experimental interpreted programming language where code stays small, rules stay regular, and keywords can be localized, including Limburgish examples.

interpreter programming-language localization parser
C++ Languages and Tools
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plat-lang-ide

Qt 6 desktop IDE for plat-lang, with a project explorer, syntax-highlighted editor, integrated terminal, and light and dark themes.

ide programming-language qt6 developer-tools
C++ Languages and Tools
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t32-asm

T32 is a minimal instruction set architecture with exactly 32 instructions, combining a register file, stack, and memory tape into a compact computational model.

assembly isa esoteric-programming-language
C++ Languages and Tools
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OpForge65

Custom C++-based assembler for the 65C02 processor — generates binary output for the ByteCradle homebrew system.

65c02 assembler 6502
C++ Languages and Tools
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cpp65

A cycle-accurate 65C02 emulator written in C++ — implements all addressing modes and the complete WDC 65C02 extended instruction set.

65c02 6502-emulation emulator
C++ Languages and Tools
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