UNIDENTIFIED

VGA GRAPHICS ADAPTER

Category                     Video
Video Types Supported        XVGA
Video Processor              Trident TVGA 8900
Highest Resolution Supported 1024 x768
Data Bus Type                16-bit ISA
Memory Type                  DRAM
Maximum Onboard Memory       2MB

[Image]

                                CONNECTIONS

         Purpose           Location           Purpose          Location

  15-pin analog video         CN1        9-pin TTL port           CN3
  port

  VGA feature connector       CN2

                                 INTERRUPT

                  IRQ9                                  J1

  »               Disabled                       Pins 2 & 3 closed

                   Enabled                       Pins 1 & 2 closed

                              MONITOR SELECT

         Setting                  SW1/A                    SW1/B

           VBA                      On                       On

           EGA                     Off                       On

           CGA                      On                      Off

      MDA/Hercules                 Off                      Off

  Note:SW1/A & B affects 9-pin TTL connection. Not present on all cards.

             REFRESH RATE

       Rate              SW1/C

  Less than 48MHz          On

     48-49MHz             Off

                              ADDRESS DECODE

                 Setting                               SW1/E

  »          Fast address decode                        Off

             Slow address decode                         On

                              8/16 BUS SELECT

                Setting                                SW1/F

  »                16-bit                               Off

                    8-bit                               On

                     BUS SIZE DETECTION

           Setting                          J2

          Autodetect                Pins 2 & 3 closed

      Standard interface            Pins 1 & 2 closed

  Note: J2 orientation varies. Check pin numbers on card.

                                CLOCK SPEED

                 Setting                                 J4

  »              40MHz(512KB)                     Pins 2 & 3 closed

                48Mhz(1 & 2MB)                    Pins 1 & 2 closed

  Note: Location of J4 unidentified. Not present on all cards.

[Image] J3

                                 DRAM SIZE

       Size              JP1                JP2                J3

      512KB              Open             Closed        Pins 1 & 2, 4 & 5
                                                             closed

       1MB               Open             Closed        Pins 1 & 4, 2 & 5
                                                             closed

       2MB              Closed             Open         Pins 2 & 3, 5 & 6
                                                             closed

       Note: JP1 & 2 are jumper blocks, number of pins unidentified. Not
       present on all cards. Orientation of J3 unidentified

                      DRAM CONFIGURATION

      Size          Bank 0          Bank 1          Bank 2

     512KB       (2)256KB x 4        None            None

      1MB        (2)256KB x 4    (2)256KB x 4        None

      2MB        (2)256KB x 4    (2)256KB x 4    (4)256KB x 4

  Note: DRAM not configurable on all cards.

  FACTORY CONFIGURED SETTINGS

     Switch         Position

     SW1/D             On