Epson ActionTower 8000, User Manual

Page: 73 / 187

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 *
J P 1 1 *
2 5 6 K B O f f O f f
5 1 2 K B O n O f f
1 M B O n O n
Installing
and Removing Options 4-9