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2. Virtual COM port - Wikipedia

   en.wikipedia.org/wiki/Virtual_COM_port

   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.

3. USB-to-serial adapter - Wikipedia

   en.wikipedia.org/wiki/USB-to-serial_adapter

   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.

4. BNU (software) - Wikipedia

   en.wikipedia.org/wiki/BNU_(software)

   BNU is a high-performance communications device driver designed to provide enhanced support for serial port communications. The BNU serial port driver was specifically targeted for use with early (late 1980s - 1990s) DOS-based BBS software. The reason for BNU and other similar enhanced serial port drivers was to provide better support for ...

5. SIO (software) - Wikipedia

   en.wikipedia.org/wiki/SIO_(software)

   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.

6. Device driver - Wikipedia

   en.wikipedia.org/wiki/Device_driver

   Virtual devices may also operate in a non-virtualized environment. For example, a virtual network adapter is used with a virtual private network, while a virtual disk device is used with iSCSI. A good example for virtual device drivers can be Daemon Tools. There are several variants of virtual device drivers, such as VxDs, VLMs, and VDDs.

7. VxD - Wikipedia

   en.wikipedia.org/wiki/VxD

   Starting with Windows 2000, Windows NT-based operating systems have adopted the Windows Driver Model from Windows 98. VxDs should not be confused with the similarly named NTVDM -specific 'VDDs' (Virtual Device Drivers), which provide a method of emulating direct I/O under a Windows NT " DOS Box ".

8. Zilog SCC - Wikipedia

   en.wikipedia.org/wiki/Zilog_SCC

   Traditional serial communications are normally implemented using a device known as a UART, which translates data from the computer bus's internal parallel format to serial and back. This allows the computer to send data serially simply by doing a regular parallel write to an I/O register, and the UART will convert this to serial form and send ...

9. Memory-mapped I/O and port-mapped I/O - Wikipedia

   en.wikipedia.org/wiki/Memory-mapped_I/O_and_port...

   In Windows-based computers, memory can also be accessed via specific drivers such as DOLLx8KD which gives I/O access in 8-, 16- and 32-bit on most Windows platforms starting from Windows 95 up to Windows 7. Installing I/O port drivers will ensure memory access by activating the drivers with simple DLL calls allowing port I/O and when not needed ...