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  2. 16550 UART - Wikipedia

    en.wikipedia.org/wiki/16550_UART

    An on-chip FIFO buffer for both incoming and outgoing data; this gives the host system more time to respond to an interrupt generated by the UART, without loss of data. Both the computer hardware and software interface of the 16550 are backward compatible with the earlier 8250 UART and 16450 UART.

  3. 8250 UART - Wikipedia

    en.wikipedia.org/wiki/8250_UART

    The 8250 UART was used in several 8-bit computers at least since 1978. IBM used the 8250 UART in the IBM PC (1981). The 8250A and 8250B revisions were later released, and the 16450 was introduced with the IBM Personal Computer/AT (1984). The main difference between releases was the maximum communication speed. [4]

  4. Universal asynchronous receiver-transmitter - Wikipedia

    en.wikipedia.org/wiki/Universal_asynchronous...

    Modems for personal computers that plug into a motherboard slot must also include the UART function on the card. The original 8250 UART chip shipped with the IBM personal computer had a one character buffer for the receiver and the transmitter each, which meant that communications software performed poorly at speeds above 9600 bit/s, especially ...

  5. Write-only memory (engineering) - Wikipedia

    en.wikipedia.org/wiki/Write-only_memory...

    An example that is still of contemporary relevance can be found in the 16550 UART, whose derivatives are still in widespread use. To add a data FIFO without breaking compatibility with the 8250 UART 's eight configuration registers, the write-only "FIFO control register" was assigned the same port address as the read-only "interrupt ...

  6. Serial port - Wikipedia

    en.wikipedia.org/wiki/Serial_port

    On Linux, 8250/16550 UART hardware serial ports are named /dev/ttyS*, USB adapters appear as /dev/ttyUSB* and various types of virtual serial ports do not necessarily have names starting with tty. The DOS and Windows environments refer to serial ports as COM ports: COM1, COM2,..etc. [15]

  7. Universal synchronous and asynchronous receiver-transmitter

    en.wikipedia.org/wiki/Universal_synchronous_and...

    The USART's synchronous capabilities were primarily intended to support synchronous protocols like IBM's synchronous transmit-receive (STR), binary synchronous communications (BSC), synchronous data link control (SDLC), and the ISO-standard high-level data link control (HDLC) synchronous link-layer protocols, which were used with synchronous voice-frequency modems.

  8. Internet protocol suite - Wikipedia

    en.wikipedia.org/wiki/Internet_protocol_suite

    The typical home PC of the time had an external Hayes-compatible modem connected via an RS-232 port with an 8250 or 16550 UART which required this type of stack. Later, Microsoft would release their own TCP/IP add-on stack for Windows for Workgroups 3.11 and a native stack in Windows 95.

  9. COM (hardware interface) - Wikipedia

    en.wikipedia.org/wiki/COM_(hardware_interface)

    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.