andrejg's starred repositories
Dragon-32-Soak-Test-Cartridge
Soak Test Cartridge for the Dragon 32 computer
Dragon3264Keyboard
Reproduction keyboard for Dragon 32 and 64 using modern switches
D32-Joystick-Adapter
Joystick adapter so that Atari-style joysticks can be used on the Dragon 32/64 and Radioshack CoCo line of computers.
Dragon-32-Repair-Ramboard
Plugin ram board for Dragon 32 Mk2 Issue 6, to replace 4116 chips with 4164
CoCoDragon-32K-EPROM-Cartridge-CC1-32KEC-0001.1
CoCoDragon-32K-EPROM-Cartridge-CC1-32KEC-0001.1 is the 32K Version of the CoCoDragon-8K-EPROM-Cartridge-CC1-8KEC-0001.1 - It is a 32K EPROM Cartridge for the Tandy Radio Shack TRS-80 Color Computer 1, 2, 3 and Dragon Data Dragon computers. This was one of the very first things that my nephew created when he was teaching himself electronics and computer design - it works, but could be better. He made and sold about 30 or so of these almost ten years ago. The design was meant to be as small as possible so as to fit entirely inside the cartridge Program Pak port and was useful for DriveWire or CoCoNet. It uses a 27256 EPROM. Updated to version 0001.1 on 5 May 2019 by “Ankle” Bob and released under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License [https://creativecommons.org/licenses/by-sa/4.0/] - there is definitely a lot of room for improvement and “Little John” made many improved versions which will be shared as I get more time to do so. There is a github page for this project here: https://github.com/TheLittleEngineers/CoCoDragon-32K-EPROM-Cartridge-CC1-32KEC-0001.1 and an OSHpark page here: https://oshpark.com/shared_projects/mqju7EpZ Notes: The CoCo 1, 2 and Dragon can only access the first 16K. The CoCo 3 can access the entire 32K, minus the 0xFFnn I/O and Vector page. Many other similar (but much improved) cartridges are forthcoming. There are much better designs in my possession and I intend to post them all, in no particular order. Please note: This is derived from an original design by "Little" John Eric and/or his father "Big" John Robert (J.R.) by "Uncle" Robert Allen. It should be thoroughly scrutinized and verified prior to actual use of any kind. DISCLAIMER: The following article is provided for informational purposes only. Any attempt to modify your computer without the proper skills to do so may void your computer. Any attempt to modify your computer without unplugging it first may void you. This Information is provided "as-is" with no guarantee of fitness for any purpose, either explicit or implied. We disclaim any and all responsibility for losses incurred through the use of this information. By using this information, you are deemed to have accepted these conditions of use, and you agree NOT to sue us. CLARIFICATION: The above disclaimer states as plainly as possible that if you decide to make use of any of the information contained within this document that you do so at your own risk. Designing hardware for the CoCo (ColorComputer) and other vintage hardware is a hobby of ours and is not motivated by any desire of profits. As this is a not for profit venture, obviously we can't afford not to disclaim the use of this information.
3d-junkyard
Random 3D models
A8PicoCart
UnoCart on a Raspberry Pi Pico clone
micropicodrive
Internal microdrive replacement for the Sinclair QL
pico-stuff
Misc things related to the Raspberry Pi Pico / RP2040
Retina-Display-eDP-Adapter-For-UP-Board
This project contains the design files for an eDP adapter and backlight driver for ipad 3 retina displays. A .brd file for a connector for CN31 is included too which can be manufactured by OSH Park flex service and costs next to nothing.
pico-rgb2hdmi
A microprocessed RGB to HDMI Converter with USB capture
zx-spectrum-pico-rom
A Raspberry Pi Pico based device to emulate a ROM on a ZX Spectrum
TI99_HOMEBREW
Repository for TI99 Homebrew Games
flashrom99
A Flash ROM Cartridge for the TI 99/4A
finalgrom99
A cartridge for the TI 99/4A that runs ROM and GROM images from an SD card
JaguarDemos
A collection of new demos for Atari Jaguar
TCB-Star-Wars-Scroller-Reverse-Engineering
Reverse engineering of "Cuddly Demos – The Star-Wars Scroller by The Carebears" on Atari ST
CPC-plus-cartridge
A CPC-plus cartridge
MOS_CPU_Replacer
MOS CPU Replacer – replace rare/expensive/unreliable MOS CPUs