A tool used by either hardware to alert software of a need or by software to control a function of hardware. Hardware and software need a way to communicate with each other, and they do so by using a combination of four system resources:
IRQ �� Hardware devices use the IRQ bus on a motherboard to signal the CPU for attention.
port addresses �� Software addresses a hardware device using the device��s port, or I/O, address. The device “listens” to the bus to determine if it is being requested.
memory addresses �� Software communicates with physical memory located in either RAM or ROM chips using memory addresses.
DMA channel �� Data travels back and forth between memory and a hardware device using this channel.
- system requirements
The hardware and software components of a computer system that are required to install and use software efficiently. The software manufacturer will list the system requirements on the software package. If your computer system does not meet the system requirements then the software may not work correctly after installation. System requirements for operating systems will […]
- System Tray
Introduced with Windows 95, the system tray is located in the Windows taskbar (usually at the bottom next to the clock) and contains miniature icons for easy access to system functions such as fax, printer, modem, volume, and more. Double click or right click on an icon to view and access the details and controls.
- System Unit
)The main part of a personal computer. The system unit includes the chassis, microprocessor, main memory, bus, and ports, but does not include the keyboard or monitor, or any peripheral devices. A system unit is sometimes called a box or main unit.
- system weight
See travel weight.
- systems analyst
A programmer or consultant who designs and manages the development of business applications. Typically, systems analysts are more involved in design issues than in day-to-day coding. However, systems analyst is a somewhat arbitrary title, so different companies define the role differently.