Ok so I found this out
Atari 400,800,822,850,1010,1200XL - 9V,1.7A
Plug Type: 5.5X2.1 Male Barrel Connector
Polarity Center Negative??
Alternative: Check HERE
Hey guys I found an Atari 400 at Goodwill and bought it yesterday. The problem is there is no power cable and I dont want to pay the $25 for the ones on ebay. Is there any new stuff that works? I thought maybe this would work but I wanna be sure it would fit the adapter plugin on the 400. Thnx
Post something in the Marketplace wanted forum here at Atari Age. You'll probably find one quickly that way. Or try Best Electronics, B & C Computervisions, or Video 61 websites.