Epson ActionTower 8100 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

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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 *
JP16
pins 1-2
JP16
pins 3-4
50 MHz (for 75 MHz CPU)
Off
Off
60 MHz (for 90 MHz CPU)
Off
On
66 MHz (for 100 MHz CPU)
On
On
*
Default setting depends on speed of CPU
Parallel port ECP mode DMA channel (DRQ) settings
Jumper number
DRQ1 DMA channel
DRQ3 DMA channel
JP8
On pins 1-2 *
On pins 2-3
JP9
On pins 1-2 *
On pins 2-3
External cache size jumper settings
External cache size
J P 1 0 *
JP11*
256KB
O f f
Off
512KB
O n
Off
1 M B
O
n
On
Installing
and Removing Options
4-9