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120 Chapter 4—SCSI and IDE Hard Drives and Optical Drives SCSI Configuration Troubleshooting When you are installing a chain of devices on a single SCSI bus, the installation can get complicated very quickly. Here are some tips for getting your setup to function quickly and efficiently: • Start by adding one device at a time—Rather than plugging numerous peripherals into a single SCSI card and then trying to configure them at the same time, start by installing the host adapter and a single hard disk. Then, you can continue installing devices one at a time, checking to make sure that everything works before moving on. • Keep good documentation—When you add a SCSI peripheral, write down the SCSI ID address and any other switch and jumper settings, such as SCSI Parity, Terminator Power, and Delayed or Remote Start. For the host adapter, record the BIOS addresses, IRQ, DMA channel, and I/O Port addresses used by the adapter, and any other jumper or configuration settings (such as termination) that might be important to know later. • Use proper termination—Each end of the bus must be terminated, preferably with active or Forced Perfect (FPT) terminators. If you are using any Fast SCSI-2 device, you must use active terminators rather than the cheaper, passive types. Even with standard (slow) SCSI devices, active termination is highly recommended. If you have only internal or external devices on the bus, the host adapter and last device on the chain should be terminated. If you have external and internal devices on the chain, you generally will terminate the first and last of these devices but not the SCSI host adapter (which is in the middle of the bus). • Use high-quality shielded SCSI cables—Make sure that your cable connectors match your devices. Use high-quality shielded cables and observe the SCSI bus-length limitations. Use cables designed for SCSI use and, if possible, stick to the same brand of cable throughout a single SCSI bus. Various brands of cables have different impedance values, which sometimes causes problems, especially in long or high-speed SCSI implementations. • Have the correct driver for your SCSI host adapter and for each device—SCSI, unlike IDE, is not controlled by your computer’s motherboard BIOS, but by software drivers. A SCSI device cannot be used unless the appropriate software drivers are installed for it. As with any other software-driven peripheral, these drivers are often updated periodically. Check for improved drivers and install them as needed.
Following these tips will help minimize problems and leave you with a trouble-free SCSI installation. Use Table 4.17 to help you record SCSI information. Table 4.18 shows a form I use to record data about my system. You can attach this information to the System Template referred to in Chapter 2, “System Components and Configuration.” Table 4.17 SCSI Device Data Sheet Interface I/O Port Card Interface card Notes and details Device information Include SCSI interface card and all devices below IRQ DMA Address Cable/ Slot Type Device ID Device Internal or Connector Y/N Name External Type Terminated? 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SCSI Configuration Troubleshooting 121
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UPGRADING AND REPAIRING PCs TECHNIC
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Associate Publisher Greg Wiegand Se
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Contents 1 General Technical Refere
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Contents vii IDE Hard Drive Identif
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Serial Port Configuration 172 Avoid
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Contents xi Sound Quality Standards
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About the Authors Scott Mueller is
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watch, photograph, and (occasionall
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Tell Us What You Think! As the read
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Chapter 1 General Technical Referen
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Understanding Bits, Nibbles, and By
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Note Glossary of Essential Terms 5
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Glossary of Essential Terms 7 Table
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Glossary of Essential Terms 9 Table
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Table 1.5 Hexadecimal/ASCII Convers
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Hexadecimal/ASCII Conversions 13 Ta
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Table 1.5 Hexadecimal/ASCII Convers
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Hexadecimal/ASCII Conversions 17 Ta
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20 Chapter 2—System Components an
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36 Caution Chapter 2—System Compo
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38 Table 2.15 Troubleshooting Power
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44 modules can be divided by 9, but
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50 Other Add-On Card Configuration
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Page 87 and 88: Chapter 3 3 BIOS Configurations and
Page 89 and 90: Where BIOS Updates Come From 71 Tab
Page 91 and 92: How to Recover from a Failed BIOS U
Page 93 and 94: Note A complete list of PnP device
Page 95 and 96: Other BIOS Troubleshooting Tips 77
Page 97 and 98: Determining the Motherboard Manufac
Page 99 and 100: Determining the Motherboard Manufac
Page 101 and 102: Table 3.8 Common Keystrokes Used to
Page 103 and 104: Phoenix BIOS Beep Codes The followi
Page 105 and 106: Port 80h Beep Code Codes Error Mess
Page 107 and 108: BIOS Configuration Worksheet 89 BIO
Page 109 and 110: BIOS Configuration Worksheet 91 Sha
Page 111 and 112: 4 SCSI and IDE Hard Drives and Opti
Page 113 and 114: Cable key prevents improperly plugg
Page 115 and 116: Breaking the 504MB (528-Million-Byt
Page 117 and 118: Table 4.3 Using LBA Mode Operating
Page 119 and 120: 5. Use the #4 option—View Current
Page 121 and 122: Using LBA Mode 103 Table 4.6 Why ID
Page 123 and 124: Sources for BIOS Upgrades 105 Table
Page 125 and 126: Improving Hard Disk Speed 107 Figur
Page 127 and 128: Bus-Mastering Chipsets for IDE 109
Page 129 and 130: Table 4.13 Bus-Mastering Chipsets b
Page 131 and 132: Table 4.14 Other IDE Drive Installa
Page 133 and 134: standard single-ended SCSI devices
Page 135 and 136: SCSI Drive and Device Configuration
Page 137: SCSI Drive and Device Configuration
Page 141 and 142: SCSI Configuration Troubleshooting
Page 143 and 144: Using FDISK 125 Using FDISK FDISK i
Page 145 and 146: Benefits of Hard Disk Partitioning
Page 147 and 148: How FDISK and the Operating System
Page 149 and 150: How FDISK and the Operating System
Page 151 and 152: Now, the operating system can use t
Page 153 and 154: The command switches are explained
Page 155 and 156: MS-DOS Command-Line Access to CD-RO
Page 157 and 158: • Make sure the drive shows up as
Page 159: Troubleshooting Optical Drives 141
Page 162 and 163: 144 Chapter 5—Floppy, Removable,
Page 174 and 175: 156 • OnStream’s ADR (Advanced
Page 178 and 179: 160 Table 5.13 High-Performance Tap
Page 184 and 185: 166 Chapter 6—Serial Ports and Mo
Page 186 and 187: 168 Table 6.2 25-Pin (PC, XT, and P
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170 Table 6.4 Overview of UART Chip
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172 Chapter 6—Serial Ports and Mo
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188 (These settings require changes
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190 Chapter 7—Parallel Ports, Pri
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192 Building a Parallel Loopback Pl
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