The Atari 1090 XL Expansion System was slated to be shipped along with several Atari produced Expansion cards that Atari XL home computer users could purchase to install and expand their computer systems with by installing them into the 1090 XL Expansion box.  Here are several of the Expansion Cards.

 

Atari Z-80 CP/M Expansion Card

Atari 80 Column Video Card

Atari 64K Memory Card

Atari Serial/Parallel Card

Atari Prototyping/Hobbyist Card

Atari BSR/RTC X10 Card

 

 

Are you a former Atari engineer?  Did you work on the 1090 or have direct knowledge of this project? 

Please contact the Atari Museum:  CLICK HERE