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GA-386UM 33/40 MAIN BOARD
GIGA-BYTE TECHNOLOGY CO., LTD
GA-386UM 33/40 MAIN BOARD
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Processor
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80386DX
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Processor Speed
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33/40MHz
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Chip Set
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OPTI
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Max. Onboard DRAM
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32MB
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SRAM Cache
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64/128/256KB
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BIOS
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AMI
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Dimensions
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220mm x 260mm
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I/O Options
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None
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NPU Options
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80387/3167
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CONNECTIONS
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Purpose
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Location
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Purpose
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Location
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Power LED & keylock
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J1
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Turbo switch
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J4
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Speaker
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J2
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Turbo LED
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J5
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Reset switch
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J3
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External battery
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J11
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Note:Board may be supplied with either a PGA (socketed) or PQFP (surface mounted) CPU.
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USER CONFIGURABLE SETTINGS
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Function
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Jumper
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Position
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NPU absent
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J7
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open
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NPU present
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J7
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closed
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Monitor type select color
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J8
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closed
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Monitor type select monochrome
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J8
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open
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CMOS memory normal operation
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J9
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pins 2 & 3 closed
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CMOS memory clear
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J9
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pins 1 & 2 closed
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DRAM CONFIGURATION
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Size
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Bank 0
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Bank 1
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1MB
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(4) 256K x 9
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NONE
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2MB
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(4) 256K x 9
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(4) 256K x 9
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4MB
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(4) 1M x 9
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NONE
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8MB
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(4) 1M x 9
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(4) 1M x 9
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16MB
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(4) 4M x 9
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NONE
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32MB
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(4) 4M x 9
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(4) 4M x 9
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SRAM CONFIGURATION
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Size
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Cache SRAM
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Location
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TAG
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64KB
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(8) 8K x 8
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Banks 0 & 1
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(1) 8K x 8
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128KB
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(4) 32K x 8
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Bank 0
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(1) 8K x 8
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256KB
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(8) 32K x 8
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Banks 0 & 1
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(1) 32K x 8
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SRAM JUMPER CONFIGURATION
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Size
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WC1
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WC2
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WC3
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WC4
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WC5
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64KB
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pins 2 & 3 closed
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open
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open
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pins 1 & 2 closed
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pins 1 & 2 closed
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128KB
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pins 1 & 2 closed
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open
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closed
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pins 2 & 3 closed
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pins 1 & 2 closed
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256KB
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pins 2 & 3 closed
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closed
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closed
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pins 2 & 3 closed
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pins 2 & 3 closed
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