Epson ActionTower 8400 User Manual - Page 73
Changing the Jumper Settings, and Removing Options
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Changing the Jumper Settings The jumpers on the system board are preset to factory default positions, indicated by an asterisk (*) in the tables below. (See the illustration under "Locating the System Board Components" to locate jumpers.) Use the information in this section to change jumper settings, if necessary. Note Any jumpers not listed in the following tables are for service purposes only. Do not change their settings. CPU clock jumper settings CPU clock speed * 50 MHz (for 75 MHz CPU) 60 MHz (for 90 MHz CPU) 66 MHz (for 100 MHz CPU) JP16 pins 1-2 Off Off On JP16 pins 3-4 Off On On * Default setting depends on speed of CPU Parallel port ECP mode DMA channel (DRQ) settings Jumper number JP8 JP9 DRQ1 DMA channel On pins 1-2 * On pins 1-2 * DRQ3 DMA channel On pins 2-3 On pins 2-3 External cache size jumper settings External cache size JP10* 256KB Off 512KB On 1MB On JP11* Off Off On Installing and Removing Options 4-9