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51 IRQ (Interrupt Request) A communications channel between a hardware device and the system processor. Originally, when hardware was added to the computer it had to be manually configured with a unique interrupt number between zero and 15. Plug-and-Play compatible systems configure resources automatically. The PCI bus introduced IRQ steering, which allowed IRQs to be shared. Modern computers use programmable interrupt controllers, allowing for hundreds of interrupts.
52 joystick A pivoting stick or lever attached to a base that is used to control movement on a device.
53 keyboard The oldest PC input device and still fundamental to operating a computer. There are many different designs and layouts for different countries. Some keyboards feature special keys.
54 KVM switch (Keyboard Video Mouse switch) A switch supporting a single set of input and output devices controlling a number of PCs. KVM are more typically used with servers but 2-port versions allow a single keyboard, mouse, and display to be used with two PCs.
55 mouse The essential device to implement a WIMP GUI, a mouse simply controls the movement of a cursor that can be used to select objects from the screen. All Windows mice feature two click buttons, which are configured to perform different actions. Many mice also feature a scroll wheel.
56 NFC (Near Field Communications) A Standard for peer-to-peer (2-way) radio communications over very short (around 4") distances, facilitating contactless payment and similar technologies. NFC is based on RFID.
57 Plug and Play A Plug and Play system (comprising a compatible BIOS, operating system, and hardware) is self-configuring. When a hardware device is added or removed, the operating system detects the change and automatically installs the appropriate drivers.
58 smart card A card with a chip containing data on it. Smart cards are typically used for authentication, with the chip storing authentication data such as a digital certificate.
59 system resources Settings that enable a device to communicate with the CPU and memory without the device conflicting with other devices.
6O touchpad Input device used on most laptops to replace the mouse. The touchpad allows the user to control the cursor by moving a finger over the pad's surface. There are usually buttons too but the pad may also recognize "tap" events and have scroll areas. 61 VR headset (Virtual Reality headset) A headset worn like goggles to interact with images displayed in the headset.
62 incident Something that is not normal and disrupts regular operations in the computing environment.
63 problem management A method of identifying, prioritizing, and establishing ownership of incidents.
64 cleaning unit Parts such as a blade, roller, or brush that rest on the surface of a laser printer's photosensitive drum that are used to clean excess toner and remove residual charge from the photoconductor.
65 corona An assembly within a laser printer that contains a wire (the corona wire), which is responsible for applying an electrostatic charge.
66 detac corona A strip that removes the charge to prevent paper curl in a laser printer.
67 developer roller A magnetized roller to which toner adheres during the printing process. See also developer unit.
68 developer unit Assembly that applies toner to areas of the photoconductor where charge has been removed by the laser. The main components are a toner hopper, transfer roller, waste toner hopper, a screw or blade to stir the toner, and a doctor blade to ensure the correct level of toner on the developer roller.
69 duplexing assembly A device that enables a printer or scanner to use both sides of a page automatically.
7O EP drum (Electrostatic Photographic drum) The component in a laser printer that carries the electrical charge to attract toner and then to transfer the toner to the paper.
71 formatter board In a laser printer, the unit that exposes and processes all of the data received from the computer and coordinates the steps needed to produce the finished page.