1-18 Dell OptiPlex Gs and Gs+ Systems Service ManualD MA Channel AssignmentsTable 1-2. System-Board Jumper DescriptionsJumper Description Settings100, 150,and 120Reserved Do not install a jumper.133 MicroprocessorspeedInstall jumper if the microprocessor’sinternal speed is 133 MHz; otherwise thejumper should not be installed.166 MicroprocessorspeedInstall jumper if the microprocessor’sinternal speed is 166 MHz; otherwise thejumper should not be installed.200 MicroprocessorspeedInstall jumper if the microprocessor’sinternal speed is 200 MHz; otherwise thejumper should not be installed.PSWD Passwordenable ordisableInstall to enable the password features.BIOS Reserved Do not install a jumper.NICRST NIC enable ordisableService procedure only. Install jumper and bootthe system to clear NIC settings and to reset thebase address to 200h. Then remove the jumper toallow configuration changes.Table 1-3. DREQ Line AssignmentsDREQ Line Used By/AvailableDREQ0 AvailableDREQ1 AvailableDREQ2 Generated by super I/O controller to initiate DMA cycle forattached diskette driveDREQ3 AvailableDREQ4 Generated by bus controller chip to activate second DMA con-trollerDREQ5 AvailableDREQ6 AvailableDREQ7 Available
