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In page COM (hardware interface):
"COM port came with the original IBM PC. IBM called the four well-defined communication RS-232 ports the "COM" ports, COM1 through COM4. In BASICA and PC DOS these ports can be opened as "COM1:" through "COM4:", and all PC compatibles using MS-DOS used the notation.[citation needed] Most PC-compatible computers in the 1980s and 1990s had one or two COM ports.
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