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The drivers for a software-implemented modem create a virtual serial port for communication with the host operating system, since the modem is implemented entirely in the device driver and therefore there is no point where the serial data would be sent to the physical card.
When the USB to serial adapter is connected to the computer via the USB-port the driver on the computer creates a virtual COM port which shows up in Device Manager on Windows, and under /dev on Linux and MacOS. This virtual COM port can be accessed and used as if it was a built-in serial COM-port.
At a lower level, a device driver implementing these functions would communicate to the particular serial port controller installed on a user's computer. The commands needed to control a 16550 UART are much different from the commands needed to control an FTDI serial port converter, but each hardware-specific device driver abstracts these ...
Operating systems provide built-in drivers for some of them. The most widely used device class for embedded devices is the USB communications device class (CDC). A CDC device can appear as a virtual serial port to simplify the use of a new device for older applications. Another solution is UsbDk.
SIO is a serial port driver package for OS/2 written by Raymond L. Gwinn. It is designed to not only improve performance over OS/2's default serial drivers, but also improve compatibility. SIO contains a virtualized FOSSIL (VX00) driver that can be loaded to provide FOSSIL support to DOS based communications software.
A man has been arrested in connection with the kidnapping of a 75-year-old woman in Pearce, Arizona on Friday, Jan 3. According to a press release from Cochise County Sheriff's Office, the woman ...
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The U.S. Federal Reserve is expected to reduce its benchmark policy rate by a quarter of a percentage point at the end of its policy meeting on Thursday, a decision that may seem a footnote given ...