Ports and Connectors
Serial: Male, 1 bit at a time and contain 9 or 25 pins.
Parallel: Female, transfer 8 bits at a time and contains 25 pins. Game port: Female, 15 pins in 2 rows. (Been replaced by USB) Mouse: PS/2 6 pin or USB
Network Interface Card (NIC): Connects computer to local network or internet. It converts parallel to serial and uses RJ-45 connector. Dial up Modem: Slowest internet connection. Standard speed is 56 Kbps. Converts analog signal to digital and does the opposite when sending info. Modern CPU's come with 2 type of video output ports.
VGA: D-Type, has 15 pins in 3 rows
Other is DVI visual port
USB: Universal Serial Busses are replacing ports and the are hot swappable, which means you can plug in while the computer is running and they will work without a reboot needed. USB 1.0: transmits at 12Mbps and cord is 3 meters.
USB 2.0: transmits at 480 Mbps and cord is 5 meters.
SCSI: Small Computer System Interface.
Narrow has 50 pins and is type A
Wide has 68 pins and is type P
IEEE 1394 (Also known as firewire): Uses serial communication, is fast, and hot swappable. Used for streaming media. (Expected to replace SCSI
Two types of computer monitors are on the market today and the are: CRT: Older and uses Cathode Ray Tube similar to tv's
LCD: Newer and Liquid Crystal Display uses TFT (Thin Film Transistor) or known as active matrix. Display is from use of backlighting to project through polarized panels. Screen size is measured diagonally from corner to corner.
Contrast Ratio: Ratio of purest white to purist black. (Bigger is better) CRT
Refresh rate: Times per second CRT beam writes to screen. (Higher number the better) Interlacing: Describes situation in which beam writes to alternating lines. (Compensates for slower refresh rate). Dot pitch: Distance between phosphorescent dots.
Resolution: Number of addressable points on a screen. Higher resolution = Sharper Picture (ex: 640x480, 1024x768) LCD
Response time: Time...
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