Parallel Ports

Unlike serial ports, parallel ports allow your computer to communicate one entire byte at a time. Eight wires are included in the cable to permit the transmission of each of the eight data bits simultaneously. Extra wires are included in the cable for control signals. Your Computer uses the industry standard “Centronics-compatible” parallel printer port interface.

MS-DOS uses the label “LPTl” (Line Printer #l) for the first parallel port. Additional parallel ports can be added to your computer through the use of multi-function boards. These ports would be labeled LPT2, LPT3, etc.

Connecting Printers

Most, but not all, printers use the Centronics-compatible parallel port.

To install this type of printer, connect an appropriate cable between the parallel port connector on the rear panel of the system motherboard in the main system unit and the input connector on the printer. Information on the correct cable will be found in your printer’s manual.

serial interface port. See the printer’s manual for complete

7-4 Expanding Your System