(TXT) View Source
       
       # MICROFIELD GRAPHICS, INC.
       
          T8
       
          Category                     Video                             
          Video Types Supported        XVGA                              
          Video Processor              Trident                           
          Highest Resolution Supported 1280 x 1024                       
          Data Bus Type                16-bit ISA                        
          Memory Type                  VRAM                              
          Maximum Onboard Memory       2048KB                            
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |               Purpose                |      Location       |
          |--------------------------------------+---------------------|
          | 15-pin video port                    |         J1          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                EMULATION TYPE CONFIGURATION                |
          |------------------------------------------------------------|
          |        Type         |   Address    |    JP1    |   JP1A    |
          |---------------------+--------------+-----------+-----------|
          | » |  VGA/EGA with   | 3DDh - 3DEh  | Pins 1 &2 | Pins 1 &2 |
          |   | High Resolution |              |  closed   |  closed   |
          |---+-----------------+--------------+-----------+-----------|
          |   |  CGA with High  | 3DDh - 3DEh  | Pins 2 &  | Pins 2 &  |
          |   |   Resolution    |              | 3 closed  | 3 closed  |
          |---+-----------------+--------------+-----------+-----------|
          |   | High resolution | 3DDh - 3DEh  | Pins 1 &2 | Pins 2 &  |
          |   |                 |              |  closed   | 3 closed  |
          |---+-----------------+--------------+-----------+-----------|
          |   | High resolution | 30Dh - 30Eh  | Pins 2 &  | Pins 1 &2 |
          |   |                 |              | 3 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 & | Pins 1  |  Open   |
          |   |  1024  |                | 2 closed |   & 2   |         |
          |   |        |                |          | closed  |         |
          |---+--------+----------------+----------+---------+---------|
          |   | 1280 x |   Interlaced   | Pins 1 & | Pins 2  |  Open   |
          |   |  1024  |                | 2 closed |   & 3   |         |
          |   |        |                |          | closed  |         |
          |---+--------+----------------+----------+---------+---------|
          |   | 1280 x | Non-interlaced | Pins 1 & | Pins 1  | Closed  |
          |   | 1024*  |                | 2 closed |   & 2   |         |
          |   |        |                |          | closed  |         |
          |---+--------+----------------+----------+---------+---------|
          |   | 1024 x | Non-interlaced | Pins 2 & | Pins 2  | Closed  |
          |   |  768*  |                | 3 closed |   & 3   |         |
          |   |        |                |          | 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 closed | Pins 1 & 2 closed |
          |---+------+---------+-------------------+-------------------|
          |   |  6   |    6    | Pins 3 & 4 closed | Pins 3 & 4 closed |
          |---+------+---------+-------------------+-------------------|
          |   |  5   |    5    | Pins 5 & 6 closed | Pins 5 & 6 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       |
          +------------------------------------------------------------+