Open source · MIT

Things we build for the 6809.

Emulators that run real CoCo software, browser tools for everyday disk work, and utilities for reverse-engineering vintage code. Most of it lives on GitHub under an open license — fork it, flash it, improve it.

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[ TTGO-VGA running CoCo 3 — drop photo ]

PRJ_00 Coming soon

TTGO-VGA CoCo 2/3 Emulator

A self-contained Color Computer 2 & 3 emulator for TTGO-VGA microcontroller boards. Connect a VGA monitor and a PS/2 keyboard and you have a complete CoCo on a board that fits in your palm — no host PC, no OS, just a faithful 6809 machine powered on.

Machines: CoCo 2 / CoCo 3
Video: VGA · MC6847 / GIME
Input: PS/2 keyboard
Status: In development

ttgo-vgacoco2coco36809

Announcement on launch →

[ ESP32-S3 + TFT running CoCo 2 ]

PRJ_01Beta-2 · Mar 2026

ESP32 CoCo 2 — XRoar Port

A complete CoCo 2 emulator running on an ESP32-S3, ported from Ciaran Anscomb's XRoar. Cycle-accurate MC6809 CPU, MC6847 video with all graphics modes, dual 6821 PIAs, SAM6883, a WD1793 floppy controller with .DSK/.VDK support, USB-HID keyboard input and SPI TFT output — all on a chip.

Platform: ESP32-S3 · 8MB PSRAM
Display: ST7789 / ILI9341 TFT
Disks: .DSK · .VDK
License: MIT

esp32-s3xroartftusb-hid

View on GitHub →

[ Web Disk Manager screenshot ]

PRJ_02Live

Web Disk Manager

A browser-based workbench for CoCo disk images. Create and edit .DSK and .VDK volumes, browse directories, and move files between images and your machine — no native software to install. Hosted, fittingly, on port 6809.

Type: Hosted web tool
Formats: .DSK · .VDK
Access: Browser · :6809
Status: Live

web-tooldisk-imagesbrowser

Open the tool →

[ CoCo Image Viewer screenshot ]

PRJ_03Live

CoCo Image Viewer

Decode and display native Color Computer graphics on a modern machine — a fast way to peek at the artwork, title screens and saved images that lived on CoCo disks and cassettes, without booting real hardware.

Type: Image utility
Decodes: CoCo graphics formats
License: Open source
Status: Live

graphicsviewer

View on GitHub →

[ 6809 disassembly output ]

PRJ_04Live

6809 Disassembler Skill

An AI-assisted disassembler skill for Motorola 6809 / 6309 machine code. Turn raw CoCo binaries back into readable, annotated assembly — a leg-up for documenting, porting and preserving vintage software whose source has long been lost.

Type: Reverse-engineering skill
Targets: MC6809 · MC6309
License: Open source
Status: Live

68096309disassembler

View on GitHub →

[ Apple-1 monitor prompt ]

PRJ_05Live

Apple-I in Python

A side-quest beyond the 6809: a 1976 Apple-1 emulator written in Python, MOS 6502 and all. A compact, readable model of where personal computing began — and a fun companion piece to our Color Computer work.

Machine: Apple-1 (1976)
CPU: MOS 6502
Language: Python
Status: Live

apple-16502python

View on GitHub →