While USB is a universal technology, not all ports on a computer have been replaced with USB for a variety of reasons.
First, some older devices still use legacy ports that predate USB, such as PS/2 ports for mice and keyboards, VGA ports for displays, and serial or parallel ports for certain types of peripherals. While these ports are less common today, they may still be used in certain situations, and some devices may not be compatible with USB.
Second, USB has gone through several different iterations over the years, with different versions offering different speeds and capabilities. For example, USB 1.0 and 1.1 had a maximum data transfer rate of 12 Mbps, while USB 2.0 could transfer data at up to 480 Mbps, and USB 3.0 and later versions can transfer data at speeds up to 5 Gbps or higher. Therefore, some devices may require specific USB versions to operate properly.
Finally, there are other types of ports that offer specialized functionality that may not be provided by USB. For example, Thunderbolt ports provide high-speed data transfer and can also support multiple displays and power delivery, while Ethernet ports allow for wired network connectivity.
Therefore, while USB is a universal technology that has become ubiquitous in modern computers and devices, it has not completely replaced all other types of ports due to the need for backward compatibility, specialized functionality, and the evolution of technology.
