skaboytd Posted March 4, 2019 Share Posted March 4, 2019 (edited) So I am working on a Atari 400 I picked up at a rummage sale (I am new to classic Atari systems) Blank screen so I do a little research and pop it open and find this board inside. It is connected to a SPDT switch that needed to be replaced. I got the 400 working but have no clue what this is or what the switch does. Any help is greatly appreciated. Edited March 4, 2019 by skaboytd 1 Quote Link to comment Share on other sites More sharing options...
AtariGeezer Posted March 4, 2019 Share Posted March 4, 2019 Looks like a Impossible OS, switch is needed to boot it up... 4 Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted March 4, 2019 Share Posted March 4, 2019 switchable ROM? looks like you have a 48k RAM upgrade too 4 Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted March 5, 2019 Share Posted March 5, 2019 Found a previous discussion about it: http://atariage.com/forums/topic/178245-atari-800-impossible-disk-backup-board/ 3 Quote Link to comment Share on other sites More sharing options...
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