The 16550 UART (universal asynchronous receiver-transmitter) is an integrated circuit designed for implementing the interface for serial communications. The corrected -A version was released in 1987 by National Semiconductor. [1]

The D16450 is a soft Core of a Universal Asynchronous Receiver/Transmitter (UART) functionally identical to the TL16C450. D16450 performs serial-to-parallel conversion on data characters received from a peripheral device or a MODEM, and parallel-to-serial conversion on data characters received from the CPU.

The PC16550D is an improved version of the original 16450 Universal Asynchronous Receiver/Transmitter (UART). This device performs serilization/deserialization (ser/des) on data between a peripheral device, such as a modem, and the central processing unit (CPU).

The 16450 UART is a very long established industry component. Data written a byte at a time into the transmit buffer is converted to serial pulses on the output (Tx) pin. Serial pulses on the input (Rx) pin are recognized and converted to byte values, which can be read from the receive buffer.

UART means Universal Asynchronous Receiver/Transmitter. This is a chip which receives and transmits data serially; each serial port you have will use one, though it is possible that several may be integrated into one chip. 8250, 16450 and 16550 are all common types of UARTs. The 8250 is an old chip which cannot run at high speed.

A 16550 UART is the minimum any modern modem user should use. All of the Byte Runner cards incorporate a 16550 as a minimum, and many even have 16650, 16750 and 16950 UARTs.

May 4, 2023 · The original IBM PC introduced BIOS functions to initialize (max 9600bps) and transfer/receive char. I am not an expert in BIOS programming (x86/16bit mode), but the above code should be much simpler than the previous uart-chip direct approach

The ST16C450 is a universal asynchronous receiver and transmitter. The ST16C450 is an improved version of the NS16450 UART with higher operating speed and lower access time. A programmable baud rate generator is provided to select transmit and receive clock rates from 50 bps to 1.5 Mbps.

Feb 3, 2018 · Assuming someone wants to use an alternate serial UART for a serial console, then one would have to disable the “ttyTHS#”. I am wondering if there is overlap in enabling/disabling DMA in some way which has an impact on operation in 16450 mode versus 16550 mode.

The PC16550D is an improved version of the original 16450 Universal Asynchronous Receiver/Transmitter (UART). Functionally identical to the 16450 on powerup (CHARAC- TER mode)* the PC16550D can be put into an alternate mode (FIFO mode) to relieve the CPU of excessive software overhead.