Each dot is produced by a tiny metal rod, also called a "wire" or "pin", which is driven forward by the power of a tiny electromagnet or solenoid, either directly or through small levers (pawls). Facing the ribbon and the paper is a small guide plate (often made of an artificial jewel such as sapphire or ruby[1]) pierced with holes to serve as guides for the pins. The moving portion of the printer is called the print head, and when running the printer as a generic text device generally prints one line of text at a time. Most dot matrix printers have a single vertical line of dot-making equipment on their print heads; others have a few interleaved rows in order to improve dot density.
These machines can be highly durable[2]. When they do wear out, it is generally due to ink invading the guide plate of the print head, causing grit to adhere to it; this grit slowly causes the channels in the guide plate to wear from circles into ovals or slots, providing less and less accurate guidance to the printing wires. Eventually, even with tungsten blocks and titanium pawls, the printing becomes too unclear to read
It has 25 pins. However, the plug on the other end of the cable often had 36 pins.
25
Parallel ata cable connecter have 40 pins.
notebook IDE connector= 44-pins Desktop IDE connector= 40-pins
34 pins in a FDD cable connector.
Parallel sockets are wide, with two rows of pins that total 25 in all. Printers and some other devices use 36 pins, but they look the same. There is a screw hole at either end to allow the connector to be fastened securely.
An RJ-45 connector has 8 pins.
A DIN connector has a 5-Pin connector
24 pins
A printer cable can connect to a serial printer using a 25-pin "RS-232", DB-25 connector, among other things. In many cases, only a few pins of the defined 25 pins are used (e.g., send, receive, common). There are also adapters that convert between the 25-pin connector and, say, RJ-11 phone cord, RJ-45 Cat 5, or even screw terminals for 3-conductor cable, or what-have-you, for connection to the computer (e.g., a DIN-8 in a Mac), or a converter for USB to RS-232. If it is a Male connector on PC it will be 25-pin Serial Port, If it is a female connector (purple colored if latest) it is parallel port, sometimes called Printer Port(LPT) - Naresh , InfoMax
== == 24-pins
The DB25 connector on the rear of a PC is used (if it has pins) to connect a printer or (if it has sockets) to connect a modem.
Parallel ATA connectors use a 40 pin female connector with one pin removed for keying.
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