TANDY/RADIO SHACK

ENHANCED GRAPHICS ADAPTER (250-4037)

Card Type                 Video card
Video Processor           Unidentified
Maximum Onboard Memory    256KB DRAM
I/O Options               Light pen port
Data Bus                  8-bit ISA
Video Types Supported     EGA
Highest Resolution        640 x 350
Supported

[Image]

                                CONNECTIONS

          Function             Label           Function             Label

  Light pen port                J5     9-pin video out               P3

                        USER CONFIGURABLE SETTINGS

                   Setting                      Label        Position

  »   Factory configured - do not alter          J4          Pins 2 & 3
                                                              closed

  »   Factory configured - do not alter         SW1/5           N/A

  »   Factory configured - do not alter         SW1/6           N/A

                   DISPLAY MODE SELECTION (EGA PRIMARY)

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

  Monochrome      None         Off         Off         On          Off

  Lo-res CGA      None          On         Off         Off         On

  Hi-res CGA      None         Off         Off         Off         On

  Lo-res EGA      None          On          On         On          Off

  Hi-res EGA      None         Off          On         On          Off

     None       Monochrome     Off          On         On          On

  Lo-res CGA    Monochrome      On          On         On          On

  Hi-res CGA    Monochrome     Off          On         On          On

  Lo-res EGA    Monochrome      On          On         On          On

  Hi-res EGA    Monochrome     Off         Off         On          On

  Monochrome    Lo-res CGA      On         Off         On          Off

  Monochrome    Hi-res CGA     Off         Off         On          Off

                  DISPLAY MODE SELECTION (EGA SECONDARY)

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

  Monochrome      None         Off          On         On          On

  Monochrome    Lo-res CGA      On          On         On          On

  Monochrome    Hi-res CGA     Off          On         On          On

  Monochrome    Lo-res EGA      On         Off         On          On

  Monochrome    Hi-res EGA     Off         Off         On          On

  Lo-res CGA    Monochrome      On          On         Off         On

  Hi-res CGA    Monochrome     Off          On         Off         On

                          MONITOR TYPE SELECTION

       Setting               J2               SW1/7            SW1/8

     Monochrome           Pins 2 & 3           On               Off
                           closed

         CGA              Pins 2 & 3           On               Off
                           closed

   400-line 25MHz         Pins 2 & 3           Off               On
                           closed

         EGA              Pins 1 & 2           On               Off
                           closed