Category Archives: Notes

Notes for A+ Exams

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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BROWN OUTS: THE EFFECTS OF BROWN OUT ON CIRCUITS, COMPONENTS AND MOTORS

A brownout is an intentional or unintentional drop in voltage in an electrical power supply system. Intentional brownouts are used for load reduction in an emergency. The reduction lasts for minutes or hours, as opposed to short-term voltage sag or … Continue reading

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HP SLATE 7: SERVICE TECH USAGE

HP SLATE 7: SERVICE TECH USAGE HP SLATE 7 ON EBAY I have to say that I absolutely love my hp slate 7. It works great. It does what it needs to. Its a nice tablet that I use to … Continue reading

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CABLE MODEM

A cable modem is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a HFC and RFoG infrastructure. Cable modems are primarily used to deliver broadband Internet access in the form of … Continue reading

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CRT MONITORS: RULE OF THUMB WHEN REPAIRING

Never use an anti-static wrist strap while working on a CRT monitor, even if it is unplugged. CRT monitors operate on very high voltages — sometimes as high as 40,000 volts — and can hold these voltages for a long … Continue reading

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