Retro Challenge Web Site

Retro Challenge 2021/10 Entrants List

Retro Challenge Twitter Page

MarkO_'s Twitter Page

Brett M Gordon's RetroChallenge Page

Twitter Feeds I am Following
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Mark Wickens
Adam Green
Michael Sternberg
John W. Linville
Brett M Gordon
Simon Jonassen
Allen Huffman
Sub-Etha Software
Davy Mitchell

Old Retrochallenge Links
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Retro Challenge Web Site

Retro Challenge 2016/10 Entrants List

Retro Challenge 2016/01 Entrants List

IRATA.ONLINE, an On-line PLATO System that you can access!!!

How To Ask Questions The Smart Way
I'm a CoCoNut!
CoCoTALK! Live!
The Forum for Tandy Color Computers and Dragons
The Rainbow, Online
CoCo Model Information


CoCo Coding site
Learning the 6809
* Learning the 6809 ( Book )
* Learning the 6809 ( Audio )
* Learning the 6809 ( Data Sheets and References )


Brett Gordon's YA-DOS



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IoT WiFi and Bluetooth
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Expressif ESP-8266
Expressif ESP-32
ESP-32 with Microchip LAN-8722

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Wendell Sanders' Apple's TelePong ( Apple Game Networking )

Multiplayer games that could be played between computers via a serial link

SpeedyG's APPLEBOX site
A Utility for Converting Modern Graphics to Apple II Graphics
Images in PNG, JPG, or XPM format to Apple II

Rick's Apple ][ Page
Rick Auricchio's Page

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William Astle's Dungeons of Dagorath ( Source of Original )
William Astle's Dungeons of Dagorath ( Source with Enhancements )

Dunjunz: Dragon version by Ciaran Anscomb
Return of the Beast: sorchard
Return of the Beast ( Source Code ): sorchard

Eamon Adventurer's Guild Online
Eamon ( tribute site )

Fuzix OS for Tandy CoCo


MOOH for Dragon & Tandy CoCo 1&2


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Richard's DynoSprite
Richard's DynoSprite Demo's
REM's Sprite Engine

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Rooms and Mazes: A Procedural Dungeon Generator

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Color Computer Game Master Cartridge ( CoCoGMC )

VGM (Video Game Music) Specification

VGM (Video Game Music) "Original" Specification

Color Computer Programmable Sound Generator ( CoCoPSG )
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DASMx : a disassembler for a range of common microprocessors.
Bud Pass Cross Assemblers and Debugers ( PC/MS-DOS Based )

Alien Clonepure is now compatible with the ECHO+

Bug Book Computer Museum
Don Lancaster's The Guru's Lair

Techno's CoCo Pages
Bill Yakowenk's CoCo Pages ( Bit-Banged Serial Routines )
SockMaster's Page
John Kowalski, Robert Gault and Nickolas Marentes Hi-Rez Mouse Page

TeraTerm ( current )
TeraTerm ( classic )

Carte Blanche 2.0 ( Overview )
Carte Blanche 2.0 ( Home )

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Schematic Capture/PCB Layout
Copper Connection ( Windows )
Osmond PCB ( Macintosh )


Alberta Printed Circuits


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F18A ( TMS9918A, 9928, and 9929 VDP)
Apple ][ F18A Adapter


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Lantronix UDS-10 Boxes and your TI


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AppleWin (GitHub )


Michael Pohoreski's AppleWin NTSC


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VR64, Virtual Reality Goggles for the Commodore 64


8-bit Bookmobile, A New Retroprogramming Podcast for the Commodore 64


Grant Searle's bits and bobs....


Kevin's FIRST Robotics Competition Code Repository

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Mac OS X versions
Mac Mini versions


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ZX-81 Programming Article
ZX81: On to Machine Code


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Notes on Video Conversions

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C64 -- C1541 Parallel Data