Category Archives: Notes

Notes for A+ Exams

MOUSE

A mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. The mouse‘s motion typically translates into the motion of a cursor on a display, which allows for fine control of a graphical user … Continue reading

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PCI DSS COMPLIANCE SUMMARY

PCI DSS COMPLIANCE SUMMARY The PCI Data Security Standard consists of 12 requirements that have been laid down under 6 different categories. Objectives PCI DSS Requirements Build and Maintain a Secure Network and Systems 1.    Install and maintain a firewall configuration to … Continue reading

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HOT SWAPPING

Hot swapping describe the function of replacing computer system components without shutting down the system. More specifically, hot swapping describes replacing components without significant interruption to the system. Hot swapping is useful for the following reasons: * configuration changes *It … Continue reading

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DMA (DIRECT MEMORY ACCESS)

Direct memory access (DMA) is a feature of modern computers that allows certain hardware subsystems within the computer to access system memory independently of the central processing unit (CPU). Without DMA, when the CPU is using programmed input/output, it is … Continue reading

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I/O ADDRESSES

Memory-mapped I/O (not to be confused with memory-mapped file I/O) uses the same address bus to address both memory and I/O devices ‒ the memory and registers of the I/O devices are mapped to (associated with) address values. So when … Continue reading

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CONTINUITY AND CONTINUITY TEST

CONTINUITY: An unbroken electrical path in an electronic circuit or connector. In electronics, a continuity test is the checking of an electric circuit to see if current flows (that it is in fact a complete circuit). A continuity test is … Continue reading

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