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MB-4F
JETPRO INFOTECH COMPANY, LTD.
MB-4F
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Processor
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80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
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Processor Speed
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20/25/33/40/50(internal)/66(internal)
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Chip Set
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FOREX
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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/AWARD
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Dimensions
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220mm x 340mm
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I/O Options
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None
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NPU Options
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80387
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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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JP2
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Turbo switch
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JP15
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Reset switch
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JP8
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Turbo LED
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JP16
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Power LED & keylock
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JP14
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Speaker
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JP17
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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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Parity check enabled
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JP5
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closed
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Parity check disabled
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JP5
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open
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Monitor type select color
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JP6
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closed
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Monitor type select monochrome
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JP6
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open
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Factory configured - do not alter
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JP19
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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) 1M x 9
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(4) 4M 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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CPU TYPE CONFIGURATION
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CPU
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JP12
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JP13
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JP30
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W1A-W1G
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W2A-W2H
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80486DX2
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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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80486DX
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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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80487SX
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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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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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80386DX
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N/A
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N/A
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N/A
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pins 2 & 3
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pins 2 & 3
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Note:Pins designated should be in the closed position.
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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(U26)
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TAG(U42)
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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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NONE
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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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NONE
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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) 8K x 8
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(1) 8K x 8
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Note:The exact locations of U26 and U42 are unknown.
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SRAM JUMPER CONFIGURATION
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Size
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JP8A
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JP8B
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JP8C
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JP8D
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JP8E
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JP8F
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64KB
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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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pins 2 & 3
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pins 1 & 2
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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 1 & 2
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pins 1 & 2
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pins 1 & 2
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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 1 & 2
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pins 2 & 3
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Note:Pins designated should be in the closed position.
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