![]() ![]() The 9-pin ones are called DE-9 (or more commonly, DB-9 even though DE-9 is its technical name) and the 25-pin ones are called DB-25. ![]() 9-pin is smaller and is used more often though in the past the 25-pin ones were used more often. 25-pin ports are not any better, they just have more pins (most unused) and are bigger. ![]() There are actually two kinds of serial port: 25-pin and 9-pin. The Wikipedia page on Serial ports has a lot of information, and it is summarised here. 3 Programming the Serial Communications Port.Many emulators such as QEMU and Bochs allow the redirection of serial output to either stdio or a file on the host computer. It is common for operating-system developers to use a system's serial ports for debugging purposes, since they do not require sophisticated hardware setups and are useful for transmitting information in the early stages of an operating-system's initialization. Serial ports are of particular interest to operating-system developers since they are much easier to implement drivers for than USB, and are still commonly found in many x86 systems. The DE-9 interface is the one most commonly used connector for serial ports in modern systems. Modern serial ports typically implement the RS-232 standard, and can use a variety of different connector interfaces. This is the hardware chip responsible for encoding and decoding the data sent over the serial interface. Serial ports are typically controlled by UART hardware. Historically it was common for many dial-up modems to be connected via a computer's serial port, and the design of the underlying UART hardware itself reflects this. Use of serial ports for connecting peripherals has largely been deprecated in favor of USB and other modern peripheral interfaces, however it is still commonly used in certain industries for interfacing with industrial hardware such as CNC machines or commercial devices such as POS terminals. Serial ports are a legacy communications port common on IBM-PC compatible computers. ![]()
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