By et al., David Groth, Faithe Wempen
The fitting A+ training and evaluate ToolFrom the writer of Sybex's best-selling A+ examine advisor comes the streamlined device you want to bone up on serious A+ details: A+ quick go. The enclosed CD enables you to perform, perform, perform so that you can procedure the tests with confidence.Coverage includes:Installing, configuring, and upgrading hardwareDiagnosing and troubleshooting problemsPerforming preventive maintenanceAddressing safeguard and environmental issuesWorking with motherboards, processors, and memoryWorking with printersUnderstanding actual networking techniquesUnderstanding OS fundamentalsInstalling, configuring, and upgrading working structures and applicationsDiagnosing and troubleshooting software program problemsConfiguring community software program
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Each device has two ports on it (most of the time). When hooking up external SCSI devices, you run a cable from the adapter to the first device. Then you run a cable from the first device to the second device, from the second to the third, and so on. Because there are two types of cabling devices, you have three ways to connect them. The methods differ by where the devices are located and whether the adapter has the terminator installed. The guide to remember here is that both ends of the bus must be terminated.
All DMA transfers use a special area of memory set aside to receive data from the expansion card (or CPU, if the transfer is going the other direction) known as a buffer. The basic architecture of the PC DMA buffers is limited in size and memory location. No DMA channel can be used by more than one device. If you accidentally choose a DMA channel that another card is using, the usual symptom is that no DMA transfers occur and the device is unavailable. Certain DMA channels are assigned to standard AT devices.
Know what other devices besides hard drives use IDE interfaces. With the popularity of IDE technology, manufacturers have introduced tape drives and CD-ROMs that use IDE interfaces. Understand RAID levels. Know that RAID 0 is performance enhancement with no fault tolerance, RAID 1 is fault tolerance with no performance enhancement, and RAID 5 is both. 7 Installing and Configuring Common SCSI Devices The small computer systems interface (SCSI) is a type of subsystem that is both highly flexible and robust.