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BASIC EGA
WESTERN DIGITAL CORPORATION
BASIC EGA
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Category
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Video
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Video Types Supported
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EGA/Monochrome
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Video Processor
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WD PEGA1A
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Highest Resolution Supported
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800 x 600
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Data Bus Type
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8-bit ISA
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Memory Type
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DRAM
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Maximum Onboard Memory
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256KB
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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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15-pin analog video port
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CN1
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Light pen connector
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CN4
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Composite video connectors
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CN2 & CN3
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VGA feature connector
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CN5
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MONITOR STARTUP CONFIGURATION
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Power Up Default
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SW1/5
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EGA operation
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Off
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Compatible operation
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On
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Note: Compatible operation further defaults to CGA/Plantronics operation if standard or enhanced RGB monitor is connected, or MDA/Hercules operation if monochrome monitor is connected.
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MONITOR TYPE SELECTION
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Type
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JP2
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SW1/1
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SW1/2
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SW1/3
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SW1/4
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Monochrome
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Pins 1 & 2 closed
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Off
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Off
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On
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Off
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Standard RGB
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Pins 1 & 2 closed
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Off
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Off
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Off
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On
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Enhanced RGB
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Pins 2 & 3 closed
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Off
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On
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On
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Off
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TWO MONITOR CONFIGURATION (BASIC EGA PRIMARY, IBM MONOCHROME SECONDARY)
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Primary Mode
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SW1/1
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SW1/2
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SW1/3
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SW1/4
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40 column on standard RGB
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On
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Off
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Off
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On
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80 column on standard RGB
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Off
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Off
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Off
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On
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200 lines on enhanced RGB
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On
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On
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On
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Off
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350 lines on enhanced RGB
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Off
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On
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On
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Off
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TWO MONITOR CONFIGURATION (IBM MONOCHROME PRIMARY, BASIC EGA SECONDARY)
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Primary Mode
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SW1/1
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SW1/2
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SW1/3
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SW1/4
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40 column on standard RGB
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On
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On
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On
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On
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80 column on standard RGB
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Off
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On
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On
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On
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200 lines on enhanced RGB
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On
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Off
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On
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On
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350 lines on enhanced RGB
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Off
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Off
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On
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On
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TWO MONITOR CONFIGURATION (BASIC EGA PRIMARY, IBM COLOR/GRAPHICS SECONDARY)
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Primary Mode
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SW1/1
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SW1/2
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SW1/3
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SW1/4
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40 column on RGB/composite
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On
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Off
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On
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Off
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80 column on RGB/composite
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Off
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Off
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On
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Off
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TWO MONITOR CONFIGURATION (IBM COLOR/GRAPHICS PRIMARY, BASIC EGA SECONDARY)
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Primary Mode
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SW1/1
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SW1/2
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SW1/3
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SW1/4
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40 column on RGB/composite
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On
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On
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Off
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On
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80 column on RGB/composite
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Off
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On
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Off
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On
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FACTORY CONFIGURED - DO NOT ALTER
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Jumper
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Position
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JP1
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Pins 1 & 2 closed
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