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5/486 MOTHERBOARD
UNIDENTIFIED
5/486 MOTHERBOARD
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Processor
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80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
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Processor Speed
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25/33/40/50(internal)/50/66(internal)MHz
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Chip Set
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Unknown
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Max. Onboard DRAM
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128MB
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Cache
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128/256KB
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BIOS
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AMI
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Dimensions
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330mm x 218mm
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I/O Options
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32-bit VESA local bus slots (3)
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NPU Options
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None
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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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External battery
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J2
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Power LED & keylock
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JP123
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Reset switch
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JP119
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32-bit memory expansion slot
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S1
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Turbo switch
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JP120
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32-bit memory expansion slot
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S2
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Turbo LED
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JP121
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32-bit memory expansion slot
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S3
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Speaker
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JP122
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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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»
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Monitor type select color
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JP31
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Closed
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Monitor type select monochrome
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JP31
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Open
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»
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CMOS memory normal operation
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JP33
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pins 1 & 2 closed
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CMOS memory clear
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JP33
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pins 2 & 3 closed
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»
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VESA clock normal
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JP118
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pins 1 & 2 closed
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VESA clock adjusted
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JP118
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pins 2 & 3 closed
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CPU SPEED
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Speed
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JP34
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JP35
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JP36
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25MHz
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Closed
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Open
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Closed
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33MHz
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Closed
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Closed
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Open
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40MHz
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Open
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Open
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Closed
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50iMHz
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Closed
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Open
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Closed
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50MHz
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Open
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Closed
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Open
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66iMHz
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Closed
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Closed
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Open
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CPU TYPE CONFIGURATION
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Type
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JP30
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80486SX
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pins 5 & 6 closed
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80487SX
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pins 1 & 2, 4 & 5, 6 & 7 closed
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80486DX
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pins 2 & 3, 4 & 5, 6 & 7 closed
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80486DX2
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pins 2 & 3, 4 & 5, 6 & 7 closed
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Pentium Overdrive
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pins 1 & 2, 4 & 5, 6 & 7 closed
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CACHE CONFIGURATION
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Size
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U51, U52, U53, U54
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U55, U56, U57, U58
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TAG
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JP58
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128KB
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(4) 32K x 8
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NONE
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(1) 8K x 8
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Pins 1 & 2 closed
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256KB
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(4) 32K x 8
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(4) 32K x 8
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(1) 32K x 8
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Pins 2 & 3 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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5MB
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(4) 1M x 9
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(4) 256K x 9
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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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17MB
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(4) 4M x 9
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(4) 256K x 9
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20MB
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(4) 4M x 9
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(4) 1M x 9
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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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64MB
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(4) 16M x 9
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NONE
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65MB
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(4) 16M x 9
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(4) 256K x 9
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68MB
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(4) 16M x 9
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(4) 1M x 9
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80MB
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(4) 16M x 9
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(4) 4M x 9
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128MB
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(4) 16M x 9
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(4) 16M x 9
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