The third seial port, here labelled COM4, belongs to the USB to serial adapter I have plugged in. On my desktop computer, the motherboard has two built in serial ports. It is usually a dongle which plugs into a USB port, with a nine pin male connecter at the other end. The USB to serial converter has arrived, and it can be used instead. Now times have changed and the serial port has vanished. Long long ago, almost all computers had two serial ports, called "COM1" and "COM2", one a with a nine pin and the other with a 25 pin connector.
The slower rate of the standard serial ports is not really a problem since non-Local Talk serial printers take much longer to process the information anyway than the computer takes to send it.īecause the two platforms (Macintosh computer systems and IBM computer systems) each use a different sort of port to connect to a printer, they can’t share the same printer without some sort of adaptation (or unless the printer is designed to support both platforms simultaneously).In order to set it up, first you have to find it on your computer. Local Talk is generally faster than the parallel ports on pcs, though the standard Mac serial ports are slower. While technically a serial port, Local Talk is much faster and more complex than the serial port used for modems and other serial printers like the Image Writer. Most Macintosh printers are serial printers, though the bulk of those use the Mac’s Local Talk network port. Parallel ports connect with cables that have parallel wires so they can transmit data faster they accommodate eight bits of data at a time (on a pc, however, parallel data can only flow in one direction at a time).
A serial port is the socket (also known as an “input/output connector”) where you plug in the cables to attach to a serial device, such as a printer or modem.ĭata is transmitted through a serial port in a single file, one bit at a time, but there are two data wires so a serial port can send and receive information simultaneously.
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