The really old EGA and CGA video connector used a DB-9 connector, but on the box they were female.
Also, if you are looking at a really old computer, you might confuse a serial port for the video port. But you can quickly tell the difference because a serial connector on the back of a computer is male and only has 9 pins where a VGA connector has 15 pins and is female (usually colored blue). It is sometimes confused with the VGA connector because of similar physical size. Note: this is usually the ONLY male connector on the back of your PC. Max data rate: 1.5 Mbps (with 16550A UART) Number found on a system: 2 possible of 4 Now let's take a look at some of the various cable types.Ĭonnector Name: DB-9 (most common) sometimes DB-25 The connector has a definite shape like a capital D (also could be called a trapezoid with rounded angles). What this is describing is the shape of the connector. DB: This term you will see in the context of DB-25 or DB-9.The outlet is the female side of the connector. The side that goes from your monitor into the wall is the male. Female Connector: I’m not going too far into this, but a male connector is the side of a connection that has the prongs-like the power plug on your computer monitor. Now technology has advanced so there is now IRQ sharing, but be mindful when working with ISA cards and older systems as you can run out fast. This used to limit the numbers of things you can put in a system. 0 is the most important and 15 is the least). The priority is determined from least to greatest (i.e. There are specific numbers to tell the CPU which peripheral needs time and the priority. This is how a peripheral tells the CPU it needs its attention. Cons: There is timing so you could say that there are blank spaces.Because the timing is uniform, there is no need for a start and stop bit. Synchronous: In this setup, data is sent as strict blocks of information.In other words, if you send 100 KB of information then it takes 120 KB to get it all there. Cons: With the use of start and stop bits you have 20% overhead.Pros: If one computer needs to send data then it can do so without having to keep stopping during each clock cycle.
There is a start bit and a stop bit to notify the other end when communication starts and stops. Instead of a timing mechanism you have communication rules. Communication without any timing mechanism. I am not here to show the weird and bizarre so when you see these types of things, look in the manual. We see a lot of this in the laptop world. There are a million differnent types of cables out there and many of them are proprietary to a particular company or product. There is also the weird and bizarre factor. Being able to recognize it may get you a job and respect from the senior members faster than if you have to look up all the old stuff. Even though you may have a tendency to turn nose up at the old stuff, you may have to work with it. In reading this, please remember that there are legacy and cutting-edge products.
This will help in troubleshooting bottlenecks and other miscellaneous problems. Also my “in the field” will describe some things to remember about these cables.
It is important to know how to recognize which cable is which by looking at it or its connector and how to troubleshoot any problems that may come up with them or their setup. This paper is meant to help you with passing the A+ exam, in building your own PC, and most importantly, on the job. Fatal error: Call to a member function sql_error() on a non-object in /host/Personal Computer Components: Cables and Connectors