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Atari User Manuals
                                                     1How Atari Signature Analysis Works 
Written by Phillip Eaton - [email protected]   
*Comments and feedback welcome & appreciated* 
 
Revision 1.1 – 2001-09-20 
· Updated contact links 
· Minor text changes 
Revision 1.0 - 1999-12-26 
· Initial Release 
 
Introduction 
Ever wondered what all those 4-digit ‘signatures’ are, that are dotted around the Atari circuit 
diagrams? They are used for diagnosing game PCB faults with an Atari CAT Box. They are 
useful because, armed with a CAT Box and a game...