UNIDENTIFIED

TOP SEGA 800

Category                  Video card
Video Type                EGA/Monochrome
Video Processor           Unidentified
Highest Resolution        800 x 600
Supported
Data Bus Type             8-bit ISA
Memory Type               DRAM
Maximum Onboard Memory    64KB (Location unknown)

[Image]

                                CONNECTIONS

         Purpose            Location          Purpose          Location

  Feature connector            J1        RCA jack 2               J4

  Light pen connector          J2        9-pin analog video       J5
                                         port

  RCA jack 1                   J3

                      I/O PORT ADDRESS CONFIGURATION

                 Port                                 JMP1

  »                3xxh                         Pins 2 & 3 closed

                   2xxh                         Pins 1 & 2 closed

                            MONITOR TYPE SELECT

                 Type                                 JMP2

  »                 EGA                         Pins 1 & 2 closed

                   Other                        Pins 2 & 3 closed

                    BIOS TYPE SELECT

            Type                       JMP3

           27128             Pins 1 & 2, 4 & 5 closed

           27256             Pins 2 & 3, 5 & 6 closed

                          CARD MODE CONFIGURATION

                Mode                        SW1/5             SW1/6

  »                EGA                       On                 On

                   CGA                       Off                On

           Monochrome/Hercules               Off               Off

                           DISPLAY CONFIGURATION

   EGA Adapter     Monochrome      CGA      SW1/1   SW1/2   SW1/3   SW1/4
                    Adapter      Adapter

  Color 40 x 25    Secondary       N/A       On     Off     Off      On

  Color 80 x 25    Secondary       N/A      Off     Off     Off      On

    EGA normal     Secondary       N/A       On      On      On     Off
      color

       EGA         Secondary       N/A      Off      On      On     Off
  Hi-resolution

   Monochrome         N/A        Color 40    On     Off      On     Off
                                  x 25

   Monochrome         N/A        Color 80   Off     Off      On     Off
                                  x 25

  Color 40 x 25     Primary        N/A       On      On      On      On

  Color 80 x 25     Primary        N/A      Off      On      On      On

    EGA normal      Primary        N/A       On     Off      On      On
      color

       EGA          Primary        N/A      Off     Off      On      On
  Hi-resolution

   Monochrome         N/A        Color 40    On      On     Off      On
                                  x 25

   Monochrome         N/A        Color 80   Off      On     Off      On
                                  x 25