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8yo.brand.320x132
8YoRetro.com
  • Cartridges
    • Atari 8-bit Hybrid Multi-Cart PCB
      • Overview
      • Build Guide
  • Diagnostic Tools
    • Port Box
      • Overview
      • Build Guide
      • Port Box User Guide
      • Technical Reference Manual
  • Display Solutions
    • Retro Alphanumeric LED Display
      • Overview
      • Build Guide
  • Keyboard Solutions
    • Atari 400 Keyboards
      • Drop-in Replacements
        • Low Profile (Kailh v2)
          • Overview
          • Build Guide
        • Standard Profile (MX)
          • Overview
          • Build Guide
      • System Integrated
        • Low Profile (Kailh v2)
          • Overview
          • Build Guide
        • Standard Profile (MX)
          • Overview
          • Build Guide
8yo.brand.320x132
8YoRetro.com

JY4_0V

  • webmaster@8yoretro.comwebmaster@8yoretro.com
  • July 20, 2026

Controller/Joystick (Joystick) port 4: Zero-volt line (ground)

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