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8MHz SYSTEM BOARD
UNIDENTIFIED
8MHz SYSTEM BOARD
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Processor
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8088
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Processor Speed
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4.77/8MHz
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Chip Set
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Unknown
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Max. Onboard DRAM
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640KB
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Cache
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None
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BIOS
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ATI
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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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8087
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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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Speaker
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CN1
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Reset switch
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JP1
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USER CONFIGURABLE SETTINGS
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Function
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Switch
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Position
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»
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Factory configured - do not alter
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SW1/1
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Off
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»
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NPU enabled
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SW1/2
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On
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NPU disabled
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SW1/2
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Off
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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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JP3
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SW1/3
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SW1/4
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256KB
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(9) 4164
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(9) 4164
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(9) 4164
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(9) 4164
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pins 1 & 2
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On
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Off
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640KB
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(9) 41256
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(9) 41256
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(9) 41256
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(9) 41256
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pins 2 & 3
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Off
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On
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Note:Pins designated should be in the closed position.
The exact locations of Banks 0 through 4 is unknown.
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MONITOR TYPE CONFIGURATION
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Type
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SW1/5
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SW1/6
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No display adapter
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On
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On
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Color (40 x 20 mode)
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Off
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On
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Color (80 x 25 mode)
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On
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Off
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Monochrome or both
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Off
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Off
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FLOPPY DRIVES INSTALLED
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Drive(s) Installed
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SW1/switch 7
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SW1/switch 8
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1
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On
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On
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2
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Off
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On
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3
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On
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Off
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4
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Off
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Off
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CPU SPEED CONFIGURATION
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Speed
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JP2
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4.77MHz
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pins 2 & 3 closed
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8MHz
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Open
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Note:The system runs at 8MHz when the power is switched on but can be changed to 4mhz by pressing <CTRL> <ALT> <-> and closing pins 1 & 2. To return back to high speed, press the three keys once again.
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