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COM (hardware interface)
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COM (hardware interface) : ウィキペディア英語版
COM (hardware interface)

COM (Communication port〔(【引用サイトリンク】url=http://publib.boulder.ibm.com/infocenter/domhelp/v8r0/index.jsp?topic=%2Fcom.ibm.help.domino.admin.doc%2FDOC%2FH_SETTING_UP_A_COMMUNICATION_PORT_STEPS.html )〕) is the original, yet still common, name of the serial port interface on IBM PC-compatible computers. It might refer not only to physical ports, but also to virtual ports, such as ports created by Bluetooth or USB-to-serial adapters.
==History==
Most PC-compatible computers in the 1980s and 1990s had one or two COM ports. As of 2007, most computers ship with one or no physical COM ports.
As of 2014, most PC-compatible computers don't include any COM ports. A lot of them do still include a COM header.
After the RS-232 COM port was removed from most IBM PC compatible computers in the 2000s, an external USB-to-UART serial adapter cable was used to compensate for the loss. A major supplier of these chips is FTDI.〔(Products; FTDI. )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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