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386SX-16-20-25
ARNOS INSTRUMENTS & COMPUTER SYSTEMS, INC.
386SX-16-20-25
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Processor
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80386SX
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Processor Speed
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16/20/25MHz
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Chip Set
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None
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Max. Onboard DRAM
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8MB
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Cache
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None
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BIOS
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Quadtel
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Dimensions
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330mm x 218mm
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I/O Options
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None
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NPU Options
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80387SX
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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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X6
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Power LED & keylock
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X14
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Turbo LED
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X11
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Status display
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X17
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Reset switch
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X12
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Speaker
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X21
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Turbo switch
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X13
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USER CONFIGURABLE SETTINGS
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Function
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Jumper/Switch
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Position
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Battery installed < 5VDC
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S1
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pins 1 & 2 closed
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Battery installed > 5VDC
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S1
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pins 2 & 3 closed
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CPU speed select switchable at keyboard
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S2
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pins 2 & 3 closed
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CPU speed select switchable at turbo switch
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S2
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pins 1 & 2 closed
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Factory configured - do not alter
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SW1/1
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N/A
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NPU enabled
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SW1/2
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Off
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NPU disabled
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SW1/2
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On
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Normal CPU speed during floppy operations
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SW1/3
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Off
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Slow CPU speed to 8MHz during floppy operations
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SW1/3
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On
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Monitor type select monochrome
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SW1/4
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Off
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Monitor type select color
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SW1/4
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On
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Factory configured - do not alter
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SW1/5
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N/A
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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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Bank 2
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Bank 3
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1MB
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(2) 256K x 9
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(2) 256K x 9
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NONE
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NONE
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2MB
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(2) 256K x 9
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(2) 256K x 9
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(2) 256K x 9
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(2) 256K x 9
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2MB
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(2) 1M x 9
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NONE
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NONE
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NONE
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4MB
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(2) 1M x 9
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(2) 1M x 9
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NONE
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NONE
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6MB
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(2) 1M x 9
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(2) 1M x 9
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(2) 1M x 9
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NONE
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8MB
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(2) 1M x 9
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(2) 1M x 9
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(2) 1M x 9
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(2) 1M x 9
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DRAM SWITCH CONFIGURATION
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Size
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Banks used
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SW1/6
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SW1/7
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SW1/8
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1MB
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0 & 1
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On
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On
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On
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2MB
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0, 1, 2 & 3
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On
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Off
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On
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2MB
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0
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On
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Off
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Off
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4MB
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0 & 1
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Off
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On
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On
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6MB
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0, 1 & 2
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Off
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Off
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On
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8MB
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0, 1, 2 & 3
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Off
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Off
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Off
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