Serial Ports
The serial port, also known as RS-232 or COM (communication) ports (see Figure 8.4), historically has rivaled the parallel port in versatility. Serial ports have been used to connect
External modems
Serial mouse or pointing devices such as trackballs or touchpads
Plotters
Label printers
Serial printers
File transfer programs such as Direct Cable Connection, LapLink, and Interlink
Figure 8.4. A 9-pin serial port (DB-9M connector, top) and a 25-pin serial port (DB-25M connector, bottom) on a typical extension bracket from an ISA multi-I/O card. The ribbon cables used to connect the ports to the card can be seen in the background.
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