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== Prerequisites == Before beginning troubleshooting: * A digital multimeter (DMM) capable of DC voltage, continuity, and resistance measurement is essential. * An oscilloscope is helpful for diagnosing clock and timing issues but is not strictly required for most common faults. * An Atari diagnostic cartridge is a valuable tool โ it provides hardware-level testing via the cartridge port and can output diagnostics over the serial port even when the display is not functioning.<ref name="diagcart">{{cite web |url=https://www.atari-wiki.com/index.php?title=Basic_Troubleshooting_-_Diagnostic_Cartridge_basics |title=Basic Troubleshooting - Diagnostic Cartridge Basics |publisher=Atari Wiki |access-date=2026-03-27}}</ref> * A known-good external floppy drive, spare TOS ROMs, and spare RAM chips are useful for substitution testing.
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