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Presence of a 25-pin D-sub connector does not necessarily indicate an RS-232-C compliant interface. For example, on the original IBM PC, a male D-sub was an RS-232-C DTE port (with a non-standard current loop interface on reserved pins), but the female D-sub connector on the same PC model was used for the parallel "Centronics" printer port ...
7.84 MB/s: PC Card 16-bit 100 ns byte mode: 80 Mbit/s: 10 MB/s: PC Card 16-bit 100 ns word mode: 160 Mbit/s: 20 MB/s: PC Card 32-bit (CardBus) byte mode: 267 Mbit/s: 33.33 MB/s: ExpressCard 1.2 USB 2.0 mode: 480 Mbit/s: 60 MB/s: 2003 PC Card 32-bit (CardBus) word mode: 533 Mbit/s: 66.66 MB/s: PC Card 32-bit (CardBus) doubleword mode: 1067 Mbit ...
It is frequently used to implement the serial port for IBM PC compatible personal computers, where it is often connected to an RS-232 interface for modems, serial mice, printers, and similar peripherals. It was the first serial chip used in the IBM PS/2 line, which were introduced in 1987. [2] [3] [4]
Today, few consumer-grade PC-compatible computers include COM ports, [3] though some of them do still include a COM header on the motherboard. [4] After the RS-232 COM port was removed from most consumer-grade computers, an external USB-to-UART serial adapter cable was used to compensate for the loss. A major supplier of these chips is FTDI.
PCI Express variants can also allow the CPU to transfer data between itself and the UART with 8-, 16-, or 32-bit transfers when using programmed I/O. 16C950 16954 Quad-port version of the 16950/16C950. 128-byte buffers. This UART can handle a maximum standard serial port speed of 921.6 kbit/s if the maximum interrupt latency is 1 millisecond ...
A male D-subminiature DE-9 connector on an IBM PC compatible computer (with serial port symbol) used for an RS-232 serial port A female D-subminiature DE-9 connector on an RS-232 cable. A serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. [1]