TANDY/RADIO SHACK

EGA/CGA GRAPHICS BOARD (250-3048A)

Card Type                   Video card
Video Processor             6845
Maximum Onboard Memory      256KB DRAM
Data Bus                    8-bit ISA
Video Types Supported       EGA
Highest Resolution          720 x 350
Supported

[Image]

             CONNECTIONS

     Function            Label

  9-pin video out         CN1

                        USER CONFIGURABLE SETTINGS

                   Setting                      Label        Position

  »   EGA mode base I/O address set to 3D0h     P3/A         Pins 1 & 2
                                                              closed

      EGA mode base I/O address set to 2D0h     P3/A         Pins 2 & 3
                                                              closed

  »   Card is installed in normal slot          P3/C         Pins 2 & 3
                                                              closed

      Card is installed in XT slot 8            P3/C         Pins 1 & 2
                                                              closed

  »   Factory configured - do not alter         SW1/7           Off

  »   Factory configured - do not alter         SW1/8           Off

                          MONITOR TYPE SELECTION

    Primary       Secondary      P1     SW1/1    SW1/2    SW1/3    SW1/4
    monitor        monitor

  Lo-res CGA     Monochrome     Pins     On       Off      Off       On
                                2 & 3

  Hi-res CGA     Monochrome     Pins     Off      Off      Off       On
                                2 & 3

  Lo-res EGA     Monochrome     Pins     On       On       On       Off
                                1 & 2

  Hi-res EGA     Monochrome     Pins     Off      On       On       Off
                                1 & 2

  Monochrome     Lo-res CGA     Pins     On       Off      On       Off
                                2 & 3

  Monochrome     Hi-res CGA     Pins     Off      Off      On       Off
                                2 & 3

            Note:Pins designated are in the closed position.

          VIDEO MODE SELECTION

   Setting        SW1/5        SW1/6

  Monochrome       Off           On

     CGA           On           Off

     EGA           On            On

                          AUTOMODE CONFIGURATION

           Setting                    P3/B                   P3/D

  »          Enabled           Pins 2 & 3 closed      Pins 1 & 2 closed

            Disabled           Pins 1 & 2 closed      Pins 2 & 3 closed