Ampro Corporation LITTLE BOARD P5X - Manual (Page 25)

Little Board/P5x Technical Manual
2–7
Jumper Summary
Ampro installs option jumpers in default positions so that in most cases the Little Board/P5x
requires no special jumpering for standard AT operation. You can connect the power and
peripherals and operate it immediately.
Jumper-pin arrays are designated W1, W2, and so forth. Jumper pins are spaced 2 mm apart. A
square solder pad identifies pin 1 of each jumper array. Table 2– 2 is a summary of jumper use.
Factory settings are shown in the Default column. Some jumpers are set at the factory to configure
options that are not user-settable. These are indicated in the table. Do not change these settings.
Table 2– 2. Configuration Jumper Summary
Jumper
Group Function Default
W1 Serial 1 RS-485 100 Ohm Termination
ON=Terminated, OFF=Unterminated OFF
W2 SCSI Termination Power
ON Connects Termination Power to SCSI Bus OFF
W3, W4,
W5
Bus/CPU Speed Setting
(Factory settings - do not change) As Req’d.
W6 CPU Voltage (Factory setting - do not change)
1/2=3.3V
2/3=2.5V As Req’d
W7 Serial 3 RS-485 100 Ohm Termination (this is a
factory option. May not be implemented on your
board)
ON=Terminated, OFF=Unterminated OFF
W8 Watchdog timer reset enable
ON=Enabled, OFF=Disabled OFF
W9 System Bus Frequency Selection (Factory option -
do not change)
ON=60 MHz, OFF=66 MHz OFF
W10 External BIOS Board Enable/Cable Connection
ON=Normal, OFF=External Cable ON
W11 BIOS Flash EPROM Programming Power
ON=Programming enabled
OFF= Programming disabled ON
W12 Compact Flash IDE Master/Slave
ON=Master, OFF=Slave ON