They connect LPT header pins 1 - 25 to DB-25 connector pins 1 - 25 (but the pins are numbered differently). Generic LPT port cables are available, and inexpensive. If a straight ribbon cable is used to connect the LPT header (pins 1 - 25) to the DB-25 connector, then Gigabyte motherboards will leave DB-25 pin 25 unconnected (DB-25 pin 25 connects to LPT header pin 24). Pins 18 - 25 should be connected to ground. The DB-25 end of the LPT cable has 25 pins. Pin 26 is connected to ground, but usually pin 24 would be connected to ground. Unfortunately, pin 24 rather than pin 26 in not connected, which is what makes Gigabyte LPT headers different. (Gigabyte provides the pinout on their website and in their user manuals.) The header is in a 2x13 configuration, which seems to be what is used on all motherboards that have LPT headers. Gigabyte motherboards that have the LPT header have an unusual pinout. The quality is fine, but it's a generic cable, it's overpriced, and it's a hassle to order. (I already had a GA-EP45-UD3R motherboard). I bought the Gigabyte LPT cable, 12CF1-1LP001-01R, directly from Gigabyte USA because I couldn't find any retailer in the United States that sells it.
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