686LX2
3-6
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
FREQ.
RATIO
EXT.CLK.
MHz
NT.CLK.
MHz
CPU Type
OFF
ON
OFF
OFF
3
66
200
Pentium
II 200 MHz
ON
ON
OFF
OFF
3.5
66
233
Pentium
II 233 MHz
OFF
OFF
ON
OFF
4
66
266
Pentium
II 266 MHz
ON
OFF
ON
OFF
4.5
66
300
Pentium
II 300 MHz
OFF
ON
ON
OFF
5
66
333
Pentium
II 333 MHz
ON
ON
ON
OFF
5.5
66
366
Pentium
II 366 MHz
M
The CPU is a sensitive electric component and it can be easily
damaged by static electricity, so users must keep it away from
