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DECPC LPX+
DIGITAL EQUIPMENT CORPORATION
DECPC LPX+
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Processor
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SL80486SX/SL80486DX/SL80486DX2/SL80486DX4/P24T
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Processor Speed
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25/33/40/50(internal)/50/66(internal)/100(internal)MHz
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Chip Set
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Unidentified
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Video Chip Set
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None
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Maximum Onboard Memory
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64MB
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Maximum Video Memory
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None
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Cache
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128/256KB
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BIOS
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Unidentified
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Dimensions
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254mm x 218mm
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I/O Options
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32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)
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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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Parallel port
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CN1
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IDE interface
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CN5
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Serial port
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CN2
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Floppy drive interface
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CN6
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Serial port
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CN3
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32-bit VESA local bus slots
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SL1 & SL2
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PS/2 mouse port
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CN4
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USER CONFIGURABLE SETTINGS
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Function
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Label
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Position
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»
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Monitor type select monochrome
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J14
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Open
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Monitor type select color
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J14
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Closed
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»
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Password normal operation
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J15
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Open
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Password clear
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J15
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Closed
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»
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Reset switch enabled
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J24
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Closed
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Reset switch disabled
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J24
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Open
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»
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Factory configured – do not alter
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J36
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Closed
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»
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VLRDY >CPURDY connects to CPU bus ready
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J44
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Pins 1 & 2 closed
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VLRDY >LRDY synchronized through chipset
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J44
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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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4MB
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(2) 256K x 36
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(2) 256K x 36
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4MB
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(2) 512K x 36
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None
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8MB
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(2) 1M x 36
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None
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16MB
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(2) 2M x 36
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None
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16MB
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(2) 1M x 36
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(2) 1M x 36
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24MB
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(2) 2M x 36
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(2) 1M x 36
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32MB
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(2) 4M x 36
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None
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32MB
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(2) 2M x 36
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(2) 2M x 36
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40MB
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(2) 4M x 36
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(2) 1M x 36
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48MB
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(2) 4M x 36
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(2) 2M x 36
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64MB
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(2) 4M x 36
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(2) 4M x 36
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Note: The location of banks 0 & 1 are unidentified.
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CACHE CONFIGURATION
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Size
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Bank 0
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Bank 1
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TAG
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128KB
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(4) 32K x 8
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None
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(2) 32K x 8
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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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(2) 32K x 8
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Note: The location of banks 0 & 1 are unidentified.
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CACHE JUMPER CONFIGURATION
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Size
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J4
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J5
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J6
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J7
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None
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Open
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Open
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Open
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Open
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128KB
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Pins 1 & 2 closed
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Pins 1 & 2 closed
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Pins 1 & 2 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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Pins 2 & 3 closed
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Pins 2 & 3 closed
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Pins 2 & 3 closed
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CPU SPEED SELECTION
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Speed
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J1
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J2
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J3
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25MHz
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Open
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Closed
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Closed
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33MHz
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Closed
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Open
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Closed
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40MHz
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Closed
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Open
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Open
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50iMHz
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Open
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Closed
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Closed
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50MHz
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Open
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Open
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Open
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66iMHz
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Closed
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Open
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Closed
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100iMHz
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Closed
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Open
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Closed
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CPU TYPE SELECTION
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Type
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J35
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SL80486SX
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Pins 2 & 3 closed
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SL80486DX
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Pins 2 & 3 closed
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SL80486DX2
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Pins 2 & 3 closed
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SL80486DX4
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Pins 2 & 3 closed
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P24T
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Pins 1 & 2 closed
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VL BUS WAIT STATE SELECTION
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Setting
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J28
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| »
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0
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Pins 1 & 2 closed
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1
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Pins 2 & 3 closed
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