ORCHID TECHNOLOGY

TURBO PGA

Category                  Video
Video Types Supported     CGA
Video Processor           Unidentified
Highest Resolution        720 x 350
Supported
Data Bus Type             16-bit ISA
Memory Type               Unidentified
Maximum Onboard Memory    Unidentified

[Image]

                           CONNECTIONS

             Purpose                         Location

  15-pin analog video connector                CN1

               ON BOARD ROM SELECT

         Setting                    W1

  On board ROM enabled             Open

  On board ROM disabled           Closed

                          DUAL PORTED RAM SELECT

                Setting                                 W2

        Dual-ported RAM enabled                 Pins 2 & 3 closed

       Dual ported RAM disabled                 Pins 1 & 2 closed

      8-bit RAM Transfers enabled                    All open

       Note:If the mother board clock is 6hz then enable the dual ported
       RAM. If the clock is higher than 6hz and failure occurs disable
       the Dual ported RAM. If you have other boards at address 0C000h or
       0D000h then remove the W2 jumper this will force 8-bit transfers.

                           VIDEO SYNC SELECT

          Setting                    W7                     W8

          IBM CGA            Pins 1 & 2 closed      Pins 1 & 2 closed

  IBM/Hercules monochome     Pins 1 & 2 closed      Pins 2 & 3 closed

      Hsync positive         Pins 1 & 2 closed             N/A

      Hsync negative         Pins 2 & 3 closed             N/A

      Vsync positive                N/A             Pins 1 & 2 closed

      Vsync negative                N/A             Pins 2 & 3 closed

  Composite sync positive    Pins 1 & 2 closed           All open

  Composite sync negative    Pins 2 & 3 closed           All open

                          SECONDARY VIDEO SELECT

      Setting              W9                W10               W11

      IBM CGA           Pins 3 & 4        Pins 3 & 4        Pins 3 & 4
                         closed            closed             closed

    Monochrome       Pins 1 & 2, 3 &   Pins 1 & 2, 3 &    Pins 1 & 2, 3 &
                        4 closed          4 closed           4 closed

                        FACTORY CONFIGURED SETTINGS

              Jumper                               Setting

                W3                                 Closed

                W4                            Pins 2 & 3 closed

                W5                            Closed (Soldered)

                W6                            Closed (Soldered)

       Note:The manufacturers documentation does not provide the
       locations of the jumpers W5 & W6. They do warn that removing the
       solder will cause failure of the board.