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