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686LX2
3.4. DRAM INSTALLATION
The mainboard can be installed with 4 / 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, 2 & bank 3.
Because the 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 ~ 1 GB EDO /
512MB 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 system's speed is fixed to 66.6MHz. The user can change the DIP
SWITCH (SW) selection to set up the CPU speed for 200 - 633MHz
processor. The CPU speed must match with the frequency RATIO. It will
cause system hanging up if the frequency RATIO is higher than CPU's.
DIP SWITCH (S1)
1
2
3
4
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
OFF
M
The CPU is a sensitive electric component and it can be easily
damaged by static electricity, so users must keep it away from
FREQ.
EXT.CLK.
NT.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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