WESTERN DIGITAL CORPORATION

BASIC EGA

Category                  Video
Video Types Supported     EGA/Monochrome
Video Processor           WD PEGA1A
Highest Resolution        800 x 600
Supported
Data Bus Type             8-bit ISA
Memory Type               DRAM
Maximum Onboard Memory    256KB

[Image]

                                CONNECTIONS

        Purpose           Location           Purpose           Location

  15-pin analog video       CN1        Light pen                 CN4
  port                                 connector

  Composite video        CN2 & CN3     VGA feature               CN5
  connectors                           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