The Dell Y9001 I/O Card is a genuine replacement component designed specifically for the OptiPlex GX520 workstation. This expansion card adds both a serial port and a PS/2 connector, enabling connection of legacy peripherals such as keyboards, mice, and serial devices without requiring external adapters. Engineered to match Dell’s original specifications, the card fits the GX520’s internal slot and integrates seamlessly with the system’s existing architecture. It provides reliable, plug‑and‑play functionality for users who need to maintain or restore traditional input and communication interfaces on their Dell desktop platform.