TANDY/RADIO SHACK

EGA/CGA GRAPHICS BOARD (250-3048)

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

[Image]

                                CONNECTIONS

          Function            Label            Function             Label

  Not used                     J1     9-pin video out connector      J3

  Not used                     J2     Not used                       J4

                        USER CONFIGURABLE SETTINGS

                 Setting                    Label          Position

  »   Factory configured - do not alter       P1         Unidentified

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

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

  »   Card will use EGA mode by default     SW1/5             Off

      Card will use CGA or monochrome       SW1/5             On
      mode by default

            Note:SW1/5 must always be turned off for Tandy SX and TX
            model mainboards.

                          MONITOR TYPE SELECTION

   Setting        P2         SW1/1       SW1/2       SW1/3        SW1/4

  Monochrome    Pins 2 &      Off         Off          On          Off
                   3

     CGA        Pins 2 &      Off         Off         Off          On
                   3

     EGA        Pins 1 &      Off          On          On          Off
                   2

            Note:Pins designated are in the closed position.