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6ZM7/6ZM7A
GD: Green LED
1
PIN 1 : LED anode (+)
PIN 2 : LED cathode ( )
3.4. DRAM INSTALLATION
The main board can be installed with 16 / 32 / 64 / 128 / 256 MB 168 pins DIMM
module DRAM, and the DRAM speed must be 50 or 60 ns for EDO & 67MHz for
SDRAM when system bus speed is set to 66MHz. The DRAM memory system
on main board consists of bank 0 and bank 1.
Since 168 pins DIMM module is 64 bits width, therefore 1 piece of DIMM
module may match a 64 bits system. The total memory size is 16 MB ~ 256MB
SDRAM, EDO DRAM size is 16MB ~ 256MB. 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 DIMM module into the DIMM socket at Vertical
angle. If there is a wrong direction of Pin 1, the SDRAM DIMM module could
not be inserted into socket completely.
3.5. CPU SPEED SETUP
The system bus frequency can be switched between 66MHz and 133MHz by
adjusting DIP SW2. The CPU frequency ratio can be switched from X3 to X9.5
by adjusting DIP SW1. The user can set up CPU speed for 366~533MHz
processors by adjusting SW1 and SW2 properly.
SW1: (O:ON / X:OFF)
FREQ. RATIO
X 3
X 3.5
X 4
X 4.5
X 5
X 5.5
X 6
X 6.5
X 7
DIP SWITCH (SW)
1
2
3
O
X
O
X
X
O
O
O
X
X
O
X
O
X
X
X
X
X
O
O
O
X
O
O
O
X
O
3-6
4
O
O
O
O
O
O
X
X
X
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