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3/486 MAINBOARD
UNITRON COMPUTER, INC.
3/486 MAINBOARD
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Processor
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80386DX/CX486DLC/80486SX/80486DX/ODP486SX/80486DX2
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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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UMC
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Max. Onboard DRAM
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32MB
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SRAM Cache
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32/64/128/256KB
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BIOS
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AMI/Phoenix
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Dimensions
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230mm x 218mm
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I/O Options
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32-bit proprietary local bus slot, 32-bit VESA local bus slot
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NPU Options
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80387DX/CX487DLC
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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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J1
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Speaker
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J29
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Turbo LED
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J25
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Power LED & keylock
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J30
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Reset switch
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J26
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32-bit local bus slot
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S1
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Turbo switch
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J28
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32-bit VESA local bus slot
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S2
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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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Monitor type select color
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J6
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pins 2 & 3 closed
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Monitor type select monochrome
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J6
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pins 1 & 2 closed
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Parity enabled
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J9
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pins 2 & 3 closed
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Parity disabled
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J9
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pins 1 & 2 closed
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Factory configured - do not alter
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J21
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Open
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Factory configured - do not alter
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J31
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Open
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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) 256K x 9
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(4) 1M 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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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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SRAM CONFIGURATION
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Size
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Cache
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Location
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TAG
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32KB
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(8) 8K x 8
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Bank 0
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(1) 8K x8
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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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J7
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J8
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J11
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J12
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J13 & J19
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J17
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J18
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32KB
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Open
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pins 2 & 3
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pins 1 & 2
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pins 1 & 2
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pins 1 & 2
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pins 1 & 2
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pins 1 & 2
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64KB
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Open
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pins 1 & 2
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pins 1 & 2
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pins 2 & 3
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pins 1 & 2
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pins 1 & 2
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pins 2 & 3
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128KB
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pins 1 & 2
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pins 2 & 3
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pins 1 & 2
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pins 2 & 3
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pins 2 & 3
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pins 1 & 2
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pins 2 & 3
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256KB
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pins 2 & 3
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pins 1 & 2
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pins 2 & 3
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pins 2 & 3
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pins 2 & 3
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pins 2 & 3
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pins 2 & 3
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Note: Pins designated should in the closed position.
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VESA MODE CONFIGURATION
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Mode
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J22
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J23
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J24
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Master
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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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Slave
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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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Note: VESA master mode can only be enabled when IC PAL 16R4 is installed.
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CPU TYPE CONFIGURATION
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CPU Type
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J10
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J14
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J15
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J16
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J20
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80386DX with NPU
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pins 1 & 2
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N/A
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pins 1 & 2
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N/A
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N/A
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80386DX w/o NPU
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pins 1 & 2
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N/A
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pins 2 & 3
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N/A
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N/A
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80486SX PQFP
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pins 2 & 3
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Open
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pins 2 & 3
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pins 2 & 3
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Open
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80486SX PGA
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pins 2 & 3
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Open
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pins 2 & 3
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pins 2 & 3
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pins 2 & 3
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80486SX
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pins 2 & 3
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pins 2 & 3
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pins 2 & 3
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pins 1 & 2
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pins 1 & 2
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80486SX + 487SX OD
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pins 2 & 3
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pins 1 & 2
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pins 2 & 3
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pins 1 & 2, 3 & 4
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pins 2 & 3
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80486SX + 486DX PGA
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pins 2 & 3
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pins 1 & 2
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pins 2 & 3
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pins 1 & 2, 3 & 4
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pins 2 & 3
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80486DX
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pins 2 & 3
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pins 2 & 3
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pins 2 & 3
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pins 1 & 2, 3 & 4
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pins 2 & 3
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80486DX2
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pins 2 & 3
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pins 2 & 3
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pins 2 & 3
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pins 1 & 2, 3 & 4
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pins 2 & 3
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CPU SPEED CONFIGURATION
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ICS2494 ( CPU Clock Generator)
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Speed
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J2
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J3
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J4
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J5
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25MHz
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pins 1 & 2 closed
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pins 2 & 3 closed
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pins 2 & 3 closed
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pins 1 & 2 closed
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33MHz
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pins 1 & 2 closed
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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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40MHz
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pins 2 & 3 closed
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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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50iMHz
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pins 1 & 2 closed
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pins 2 & 3 closed
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pins 2 & 3 closed
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pins 1 & 2 closed
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50MHz
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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 1 & 2 closed
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66iMHz
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pins 2 & 3 closed
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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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CPU SPEED CONFIGURATION
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IMISC425 ( CPU Clock Generator)
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Speed
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J2
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J3
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J4
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J5
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25MHz
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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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pins 1 & 2 closed
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33MHz
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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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pins 1 & 2 closed
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40MHz
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pins 1 & 2 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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50iMHz
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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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pins 1 & 2 closed
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50MHz
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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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pins 2 & 3 closed
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66iMHz
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pins 1 & 2 closed
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pins 1 & 2 closed
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pins 2 & 3 closed
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pins 2 & 3 closed
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