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Tag: Crystal Clock

Case Studies in Retro Computing Repair #15: Diagnosing and Fixing the Crystal Clock Oscillator Circuit in an Atari 800XL

November 22, 2025 moorejh28@gmail.com Hardware, Repair

Introduction I friend brought me his Atari 800XL that was not generating any video signal. I confirmed with a multimeter that the chips were all getting good voltages. None of the chips were overly hot, and I confirmed with a working machine that they were all good. Case Study Given

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