End of a business URL

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COM.

Last seen on: USA Today Crossword – Mar 9 2021

Random information on the term “COM”:

COM (communication port) is the original, yet still common, name of the serial port interface on PC-compatible computers. It can refer not only to physical ports, but also to emulated ports, such as ports created by Bluetooth or USB adapters.

Most PC-compatible computers in the 1980s and 1990s had one or two COM ports. by 2007, most computers shipped with one or no physical COM ports. Today few consumer-grade PC-compatible computers include COM ports, though some of them do still include a COM header on the motherboard.

After the RS-232 COM port was removed from most consumer-grade computers, an external USB-to-UART serial adapter cable was used to compensate for the loss. A major supplier of these chips is FTDI.[citation needed]

The COM ports are interfaced by an integrated circuit such as 16550 UART. This IC has seven internal 8-bit registers which hold information and configuration data about which data is to be sent or was received, the baud rate, interrupt configuration and more. In the case of COM1, these registers can be accessed by writing to or reading from the I/O addresses 0x3F8 to 0x3FF.

COM on Wikipedia