Welcome to the Atari 1090 Expansion Projects
It is the intention of this website to help bring together as much technical knowledge on the Atari PBI (Parallel Bus Interface) and its XE version the ECI (Enhanced Cartridge Interface) to allow those interested in creating PBI/ECI based upgrades for the XL/XE lines of computers and also with modifications, an Atari 800 can be PBI equipped.
The new 1090 Expansion System box project
Technical Data and files
Older non-1090 Enhancement Projects
New 1090 PBI Card project