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Chapter 11: Advanced Personal Computers 15Most SCSI buses can handle a total of seven devices and a SCSI controller. The channelsare numbered from 0 through 7. Some versions of SCSI support a total of 15 devices plusthe SCSI controller. These channels are numbered 0 through 15. Each device on a SCSIchannel must have a unique SCSI ID. For example, the primary drive would be 0 and thecontroller card is usually 7. The SCSI ID is generally set by jumpers on a SCSI drive.The SCSI bus was originally 8 bits wide and operated at a transfer rate of 5 MBps. LaterSCSI technologies used a 16-bit bus and operated at 320–640 MBps. Table 11-1 shows thedifferent types of SCSIs. Current and future SCSI technologies use a serial interface forincreased speed.Table 11-1SCSI TypesSCSI Type Also Called Connector Maximum Throughput (MBps)SCSI-1 — 50-pinCentronics 50-pin 5Fast SCSI Plain SCSI 50-pinCentronics 50-pin 10Fast Wide SCSI — 50-pin68-pin 20Ultra SCSI Fast-20 50-pin 20Ultra Wide SCSI — 68-pin 40Ultra2 SCSI Fast-40 50-pin 40Ultra2 Wide SCSI — 68-pin80-pin 80Ultra3 SCSI Ultra-160 68-pin80-pin 160Ultra320 SCSI — 68-pin80-pin 320Narrow SCSI is 8 bits wide and Wide SCSI is 16 bits wide. Narrow SCSI uses 50-pin connectorsand Wide SCSI uses 68-pin connectors. Internal connections use 80-pin connectors.
16 IT Essentials: PC Harware and Software Companion GuideSelect Input and Output DevicesAn input device can be any piece of equipment that transfers information into a computer:■■■■■■■MouseKeyboardScannerCameraProcess control sensorMIDI interfaceMicrophoneAn output device transfers information to the outside of the computer:■■■■■Display monitorProjectorPrinterProcess-control equipmentSpeakerTo select input and output devices, you should first find out what the customer wants. Next,you should select the hardware and software by researching the Internet for possible solutions.After you determine which input or output device the customer needs, you mustdetermine how to connect it to the computer. Figures 11-12 shows common input and outputport symbols.Figure 11-12 Common Input and Output Port Symbols
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iiiTrademark AcknowledgmentsAll ter
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vAbout the Technical ReviewersDavid
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ixIdentify the Names, Purposes, and
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CHAPTER 1Introduction to the Person
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CHAPTER 5Fundamental Operating Syst
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CHAPTER 7Fundamental Printers and S
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CHAPTER 13Advanced Laptops and Port
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CHAPTER 14Advanced Printers and Sca
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CHAPTER 15Advanced NetworksObjectiv
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GlossaryThis glossary defines many
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ase station 3AppleTalk A protocol s
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CMOS battery 5bus topology A networ
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desktop computer 7crosstalk Interfe
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dynamic routing 9Domain Name System
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floppy data cable 11FFast Ethernet
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IEEE 802.11 13Hardware Compatibilit
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Internet service provider 15infrare
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media-handling options 17line of si
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network operating system 19multithr
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ping 21Page Description Language (P
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Regedit 23Printer Control Language
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three-claw part retriever 27surge s
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virtual memory 29Uninterruptible Po
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zero insertion force (ZIF) socket 3
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