
MICROFIELD GRAPHICS, INC.

T8

Category                    Video
Video Types Supported       XVGA
Video Processor             Trident
Highest Resolution          1280 x 1024
Supported
Data Bus Type               16-bit ISA
Memory Type                 VRAM
Maximum Onboard Memory      2048KB

[Image]

           CONNECTIONS

       Purpose         Location

  15-pin video port       J1

                       EMULATION TYPE CONFIGURATION

           Type                 Address           JP1            JP1A

       VGA/EGA with High     3DDh - 3DEh      Pins 1 &2       Pins 1 &2
           Resolution                           closed          closed

          CGA with High       3DDh - 3DEh      Pins 2 & 3     Pins 2 & 3
           Resolution                           closed          closed

        High resolution       3DDh - 3DEh      Pins 1 &2      Pins 2 & 3
                                                closed          closed

        High resolution       30Dh - 30Eh      Pins 2 & 3      Pins 1 &2
                                                closed          closed

            Note: Address setting 30Dh - 30Eh requires special device
            driver software for operation.

                       VIDEO FREQUENCY CONFIGURATION

   Frequency            Mode             S1           S2           S7

      1280 x      Non-interlaced     Pins 1 & 2   Pins 1 & 2     Open
        1024                           closed       closed

       1280 x        Interlaced       Pins 1 & 2   Pins 2 & 3     Open
        1024                           closed       closed

       1280 x      Non-interlaced     Pins 1 & 2   Pins 1 & 2    Closed
       1024*                           closed       closed

       1024 x      Non-interlaced     Pins 2 & 3   Pins 2 & 3    Closed
        768*                           closed       closed

  Note: * This is an alternate setting which requires an optional dual
  crystal and 512K microcode EPROM.

                   ALTERNATE I/O PORT ADDRESS SELECTION

               Address                                 S6

                  3xx                         Pins 2 & 3 closed

                   1xx                          Pins 1 &2 closed

                           DMA CHANNEL SELECTION

       DRQ              Dack                S5                 S8

          7              7             Pins 1 & 2      Pins 1 & 2 closed
                                          closed

           6              6             Pins 3 & 4      Pins 3 & 4 closed
                                          closed

           5              5             Pins 5 & 6      Pins 5 & 6 closed
                                          closed

                         VIDEO INTERRUPT SELECTION

                  IRQ                                   S3

                    2/9                         Pins 1 & 2 closed

                     10                          Pins 3 & 4 closed

                     11                          Pins 5 & 6 closed

                     12                          Pins 7 & 8 closed

                  Disabled                      Pins 9 & 10 closed

