In serial communication, the chunks of the data are sent one after the other. Apple computers have never used a parallel port.Now, what the serial and parallel communication indicates here. The Apple Macintosh computers use SCSI as its interface, which is parallel, but a lot more flexible compared to the parallel port used with IBM compatible computers. Parallel port scanners are a popular alternative to SCSI scanners because of how easy they are to install.Įxternal drives - Parallel ports are popular with external drives such as the Iomega Zip drive, which can be removed from one computer and connected to another. Scanner - Another commonly used parallel device is a parallel port scanner. Printer - The most common use for the parallel port. However, below is a listing of various hardware components that were used with the parallel port. Today, the parallel port has widely been replaced by the USB port. Pin 17 - When low signal the PC has selected the printer and should in return prepare for data. Pin 16 - When low signal PC has requested that the printer initiate an internal reset. Pin 15 - Printer sends data to the computer telling it that an error has occurred. Pin 14 - When low signal PC has indicated that the printer inset a line feed after each line. Pin 13 - When high signal printer is indicating that it is on-line and ready to print. Pin 12 - Printer paper jam when signal is high or no signal if printer jam. Once this signal goes low and Pin 10 goes high, more data is ready to be accepted. Pin 11 - When the signal goes high indicate that the printer has accepted the data and its being processed. Pin 10 - Acknowledge that the data has finished processing and when the signal is high indicates ready for more. Pin1 - Data acknowledgement when the signal is low. PINīelow is an explanation of each of the above purposes. Pin 1 through 25 identified in the image above.
Below is additional information about each of the pins on this connector. Although there are 50 foot cables, it is not recommended that these cables be used as it can create poor connection and data signals.
The DB25 connector had an 8-bit data bus and a maximum cable length of 15-feet. Some of these modes include: IEEE-1284 (Auto), Centronics mode, Nibble Mode, SPP (unidirectional), bidirectional, EPP, and ECP. The computer is capable of having the parallel port run at different modes depending on your needs and available resources. The connection is in the shape of the letter D, is a female connector, and has 25 holes.
In the above picture, you can see the DB25 parallel port connection is easy to identify because it's the biggest connection on the back of the computer. Also, many new computers and laptops no longer have a parallel port. With the introduction of USB, FireWire, and other faster solutions, parallel ports are rarely used anymore.
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