Atari 7800 Development Suite — powered by MADS assembler
// 001 — Software
A complete HTML-based toolchain for Atari 7800 homebrew development. All tools run in your browser — no install required. Build tilemaps, paint sprites, export ROMs.
Complete tilemap & sprite editor for 160A mode. 16×16 tiles, 10-column maps up to 999 rows, variable-width sprites (8–32px), 8 shared palettes in 2bpp. Full undo/redo, free placement, .eagle chunk-based save format.
Launch Tool →EPM format pixel editor with CIEDE2000 color matching against the Trebor palette. Supports PNG import with palette optimization and "skip odd px" for 160A double-wide pixel handling. Full PAL warm color generation.
Launch Tool →Export to S78 ROM format with proper Maria 160A interleaved layout. Generates complete display list architecture, A78 headers, and MADS-compatible assembly source. POKEY audio support included.
Launch Tool →Math table generators for 3D transforms, graphics converters with advanced dithering, and utility tools for palette management. Everything you need to complement the main editors.
Launch Tool →// 002 — Technical
Game Maker targets the Atari 7800's MARIA graphics chip in 160A mode — the sweet spot for homebrew game development.
// 003 — Showcase
Demoscene-grade visual effects running on the Atari 7800's hardware constraints. Pushing the MARIA chip to its limits.
Comanche-style voxel landscape renderer — heightmap + colormap raycasting on 6502
Wolfenstein-style raycasting engine with textured walls and variable draw distances
Classic demoscene infinite chessboard with 3D perspective projection and smooth scrolling
Real-time texture zoom and rotation with pre-computed math tables for 6502 performance
Hexagonal tunnel racing inspired by Terry Cavanagh's classic — pure Maria chip rendering
3D tube racing with perspective-corrected inner surface and ball physics
// 004 — Author
Eagle (Dariusz) is a 6502 assembly programmer and retro computing enthusiast specializing in Atari 7800 homebrew development. With deep expertise in the MARIA graphics chip and demoscene programming, Eagle builds tools that make 7800 development accessible to the homebrew community.
All tools are browser-based HTML applications — no install, no dependencies. Just open and create. The Game Maker suite is powered by the MADS assembler and outputs production-ready assembly source and ROM images.
These tools are free for the Atari 7800 homebrew community. If you build something cool with them, share it!