9
Standard serial ports have either 5 pins or 25 pins. Although are also serial ports, USB and PS/2 ports do not obey this rule.
The traditional parallel port is a 25 "d-sub" connector. Serial ports come in two flavors, either 25 pin "d-sub" or 9 pin. USB (another serial communication standard) is a different animal. PS/2 is also a serial port and it has six pins.
9
9
15 pins
It refers to the 25-pin or 9-pin male serial port on the back of a PC. "A serial port conforms to the interface standard called RS-232c (Reference Standard 232 revision c), which is why a serial port is sometimes called the RS-232 port. The maximum cable length for a serial cable according to RS-232 standards is 50 feet. This interface standard originally called for 25 pins, but because microcomputers use only nine of those pins, manufacturers often installed a modified 9-pin port." -CompTIA A+ Guide to Managing & Maintaining You PC Sixth Edition
A video port has 15 pins (3 rows of 5 each) A video port, also known as a Serial Port, has 3 rows of 5 pins which is 15 pins.
It's called a COM port.
how many ports does com port have
If it has 15 pins it is NOT a serial port! A serial port will have either 9 pins (DB-9), or 25 pins (DB-25). The 15 pin connector (usually blue) is analog video or VGA, and yes if your graphics card is powerful enough it can run dual monitors. You can either buy a dual port graphics card or a splitter to run dual monitors
It is a D shaped connector and has got 9 pins in it.
9=pins