Although USB ports have largely replaced older connection types, many gaming motherboards and computers still come equipped with PS2 ports. This might seem surprising, given that PS2 was predominantly used for keyboards and mice and has been almost entirely supplanted by USB for these devices. However, there are compelling reasons for the continued presence of PS2 ports in modern systems.
Understanding PS2 Ports
The PS2 port, introduced by IBM in 1987 with its Personal System/2 series, is a 6-pin mini-DIN connector. Typically, these ports are color-coded—purple for keyboards and green for mice—and feature a corresponding icon to indicate their purpose. Although keyboard and mouse PS2 ports appear similar, they are not interchangeable due to the specific drivers required for each.
Key Reasons for Retaining PS2 Ports on Modern Motherboards
Enhanced Compatibility and BIOS Support
PS2 ports offer compatibility with older peripherals, which is crucial for users with high-end or specialized equipment not supported by USB. Additionally, PS2 peripherals often face fewer issues during BIOS setup as they are recognized directly by the motherboard, unlike USB devices that may not initialize until the OS boots.
Preferred by Gamers for Lower Latency
In competitive gaming, where every millisecond counts, the lower latency of PS2 ports can offer a slight edge. PS2 devices communicate interrupts directly to the CPU, avoiding the polling required by USB devices, which can introduce delays. While modern gaming equipment largely mitigates these issues, some gamers still prefer the minimal latency offered by PS2 connections.
Security Considerations
In environments where security is paramount, USB ports may be disabled to prevent unauthorized data transfers. PS2 ports provide a secure alternative for connecting essential peripherals like keyboards and mice, ensuring functionality without compromising security.
Technical Advantages of PS2 Ports
N-Key Rollover and Key Registration
PS2 keyboards support true N-Key rollover, allowing them to register multiple keys pressed simultaneously—an essential feature for certain professional and gaming applications. While modern USB keyboards have largely addressed these limitations, enthusiasts and professionals with specific needs may still prefer the guaranteed performance of PS2 keyboards.
Low Polling Rate and CPU Usage
PS2 ports operate with minimal CPU overhead as they do not require the constant polling typical of USB connections. This direct communication means that devices connected via PS2 can perform optimally without impacting the processor’s performance, which can be particularly beneficial in resource-intensive tasks.
The Case for Legacy-Free PCs
Despite the advantages, the trend towards legacy-free PCs is growing. These systems do away with older ports like PS2, freeing up space for additional modern connections and capabilities. This approach caters to users who prioritize future-proofing and maximizing performance without the constraints of outdated technology.
Conclusion
While it may appear outdated, the inclusion of PS2 ports on some motherboards is justified by specific needs in gaming, security, and legacy support. As technology evolves, the balance between maintaining legacy support and embracing modern standards will continue to shape motherboard designs. Whether or not to opt for a motherboard with PS2 ports depends on individual requirements and the value placed on the benefits they provide.
