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2-6 Hardware Description
Motherboard
Motherboard
General
Description
The Vanguard 6435 motherboard contains 4 Mbytes FLASH and has 16 Mbytes of
SDRAM (synchronous DRAM) on an attached DIMM (expandable to 32 Mbytes of
SDRAM). The Vanguard 6455 has 32 Mbytes of SDRAM.
The motherboard has connectors for:
• FLASH expansion: 4 Mbyte SIMM
• Vanguard 6435 - SDRAM Expansion: 16 Mbyte DIMM standard, 32 Mbyte
optional. When using 8Mbyte flash, 32 Mbyte is recommended.
• Vanguard 6455- 32 Mbyte recommended
• Data Compression/Encryption SIMM
• Two DIMS
• Three Vanguard Daughtercards
• Two Enhanced Vanguard Daughtercards
There are three DIP switches:
• Two DIM DIP switches
• One Test Mode switch
There is a battery which provides power for the unit’s real time clock.
Figure 2-6 shows the location of the motherboard components.
Figure 2-6. Vanguard 6435/6455 Motherboard
Test Mode
DIP Switches
SDRAM
Data Compression/
Flash SIMM Slot
Daughtercard Slot 2
Daughtercard Slot 1
Daughtercard Slot 3 Port 2 Switch 1
Port 1 Switch 3
DIM Slot 2
DIM Slot 1
Battery
Encryption SIMM Slot
DIMM Slot
Slots 2 and 1
LCD Display
Connector *
Power Supply
Connector *
Fan Connector *
* 6435 only.
Enhanced Vanguard Daughtercard