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80486SX/DX MOTHERBOARD
UNIDENTIFIED
80486SX/DX MOTHERBOARD
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Processor
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80486SX/80487SX/80486DX
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Processor Speed
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16/20/25/33MHz
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Chip Set
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Acer
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Max. Onboard DRAM
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32MB
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SRAM Cache
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None
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BIOS
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AMI/AWARD
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Dimensions
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230mm x 220mm
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I/O Options
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None
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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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J4
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Turbo LED
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J21/pins 1 & 2
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Reset switch
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J19
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Turbo switch
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J21/pins 4 & 5
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Speaker
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J20
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Power LED & keylock
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J22
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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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JP1
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pins 2 & 3 closed
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Monitor type select monochrome
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JP1
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pins 1 & 2 closed
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I/O BUS SPEED CONFIGURATION
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Jumper
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OSC1/5
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OSC1/6
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OSC1/8
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JP3
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pins 2 & 3 closed
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pins 1 & 2 closed
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pins 1 & 2 closed
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JP6
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pins 1 & 2 closed
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pins 2 & 3 closed
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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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CPU JUMPER CONFIGURATION
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CPU
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JP4
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JP5
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80486SX
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open
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pins 1 & 2 closed
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80487SX
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pins 1 & 2 closed
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pins 2 & 3 closed
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80486DX
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pins 2 & 3 closed
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pins 2 & 3 closed
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