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Atari Asteroids Deluxe Signature Analysis Guide

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    Page 1 ASTEROIDS DELUXESIGNATURE ANALYSISGUIDE
    Page 2 1IntroductionThis guide is intended as an aid to troubleshooting the Asteroids Deluxe video game PCB. The Signature Analyzer used to produce this guide was an HP5004a. If it is found that the signatures hold up for other makes/models of Signature Analyzers then please let me know and I can add some kind of compatibility list to the document. Suggestions of any kind to improve this document are always welcome. To get the most out of the guide you’ll need Signature Analyzer (HP5004a) Schematics for...
    Page 3 2The probe column refers to either the Start, Stop or Clock probes from the Signature Analyzer. The trigger column sets up the Start/Stop/Clock buttons on the front of the Analyzer. I have used –ve to indicate the negative going edge of the pulse (or the falling edge). I have used +ve to indicate the positive going edge of the pulse (or the rising edge). The IC Pin column refers to the point where the appropriate probe should be attached. The Test Pt. column refers to an equivalent Test Point on the...
    Page 4 4What To Do When You Find An Incorrect SignatureIf you find a signature that doesn’t match the guide, check your set up first. If your set up is OK then you’ll need to trace the fault. Rather than having a long winded ramble from me it would be better to look at the following link on Al Kossow’s page. If you haven’t already had a look at his site then I’d definitely recommend having a look as it’s a bit of a gold mine. http://www.spies.com/arcade/TE/SigAnalNotes.pdf After you’ve had a look through the...
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