JETWAY J-791A User Manual page 8

2. SDRAM Clock Selector: U2 #4
This selector can choose SDRAM clock Synchronous or Asynchronous to CPU Bus frequency. When
choose Asynchronous can let users have more choice of NON-PC100 SDRAM at over 66 MHz Bus
frequency .
U2 #4 ON
U2 #4 OFF
3. CMOS RAM: JBAT1 (Yellow color selector)
WARNING: Make sure your computer is POWER OFF when you are CLEAR CMOS.
Connect a jumper Cap over this jumper for a few seconds, will clears information stored in
the CMOS RAM Chip that input by user, such as hard disk information and passwords.
After CLEAR CMOS, you must enter the BIOS setup (by holding down <DEL> during
power-up) to re-enter BIOS information (see BIOS SETUP).
Selections
Normal
Clear CMOS
!
ON
ON
U4
1 2 3 4 1 2 3
233MHz
266MHz
ON
ON
U2
1 2 3 4
1 2 3
233MHz
266MHz
SDRAM clock same as AGP clock (66MHz) Asynchronous.
SDRAM clock same as CPU Bus clock (66MHz,75MHz,100MHz,
103MHz,112MHz): Synchronous.
JBAT1
1-2 (Default)
2-3 (momentarily)
JUBA1
1
2
3
Normal
CMOS RAM (Normal / Clear CMOS Data)
ON ON
1 2 3 4 1 2 3 4
4
333MHz
300MHz
ON
ON
1 2 3 4 1 2 3 4
4
300MHz 333MHz
JUBA1
1
2
3
Clear CMOS
7
ON ON
O N
1 2 3 4 1 2 3 4
1 2
350MHz 400MHz 450MHz
ON
ON ON
1 2 3 4 1 2
1 2 3 4
400MHz
350MHz 450MHz
3 4
3 4