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686LX3
3.4. DRAM INSTALLATION
The mainboard can be installed with 8 / 16 / 32 / 64 / 128 / 256 MB 168 pins
DIMM module DRAM, and the DRAM speed must be 50 or 60 ns for EDO &
67~100 MHz for SDRAM. The DRAM memory system on mainboard consists
of bank 0, 1 & bank 2.
Since 168 pins DIMM module is 64 bits width, using 1 PCS which can match a
64 bits system. The total memory size is 8 MB ~ 768 MB EDO / 384MB SDRAM.
The DRAM installation position refer to Figure 3.1, and notice the Pin 1 of
DIMM module must match with the Pin 1 of DIMM socket. Insert the DRAM
DIMM module into the DIMM socket at Vertical angle. If there is a wrong
direction of Pin 1, the DRAM DIMM module couldn't be inserted into socket
completely.
3.5. CPU SPEED SETUP
The default system bus speed is 66MHz. The user can change the DIP
SWITCH (SW) selection to set up the CPU speed for 200 - 366MHz processor.
The CPU speed must match with the frequency RATIO and external clock
frequency. It will cause system hanging up if the frequency RATIO and external
clock frequency are higher than that of CPU.
DIP SWITCH (SW)
1
2
3
4
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
FREQ.
EXT.CLK.
INT.CLK.
RATIO
MHz
MHz
3
66
200
3.5
66
233
4
66
266
4.5
66
300
5
66
333
5.5
66
366
3-6
CPU Type
Pentium II 200 MHz
Pentium II 233 MHz
Pentium II 266 MHz
Pentium II 300 MHz
Pentium II 333 MHz
Pentium II 366 MHz
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