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# MICROFIELD GRAPHICS, INC.
T8C
Category Video
Video Types Supported CGA/EGA/VGA/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 analog video port | J1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EMULATION TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | Address | JP1 | JP1A |
|---------------------+--------------+-----------+-----------|
| » | VGA/EGA with | 3DDh - 3DEh | Pins 1 &2 | Pins 1 & |
| | High Resolution | | closed | 2 closed |
|---+-----------------+--------------+-----------+-----------|
| | CGA with High | 3DDh - 3DEh | Pins 2 & | Pins 2 & |
| | Resolution | | 3 closed | 3 closed |
|---+-----------------+--------------+-----------+-----------|
| | High resolution | 3DDh - 3DEh | Pins 1 & | Pins 2 & |
| | | | 2 closed | 3 closed |
|---+-----------------+--------------+-----------+-----------|
| | High resolution | 30Dh - 30Eh | Pins 2 & | Pins 1 & |
| | | | 3 closed | 2 closed |
|------------------------------------------------------------|
| Note:Address setting 30Dh - 30Eh requires special |
| device driver software for operation. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ALTERNATE I/O PORT ADDRESS |
|------------------------------------------------------------|
| Address | S6 |
|----------------------------+-------------------------------|
| » | 3xx | Pins 1 & 2 closed |
|---+------------------------+-------------------------------|
| | 1xx | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS SIZE SELECT |
|------------------------------------------------------------|
| Size | J10 |
|----------------------------+-------------------------------|
| 16KB | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 32KB | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO FREQUENCY SETTINGS |
|------------------------------------------------------------|
| Frequency | Mode | S1 | S2 | S7 |
|------------+----------------+----------+---------+---------|
| 1280 x | Non-interlaced | Pins 2 & | Pins 2 | Open |
| 1024 | | 3 closed | & 3 | |
| | | | closed | |
|------------+----------------+----------+---------+---------|
| 1280 x | Interlaced | Pins 2 & | Pins 1 | Open |
| 1024 | | 3 closed | & 2 | |
| | | | closed | |
|------------+----------------+----------+---------+---------|
| 1280 x | Non-interlaced | Pins 2 & | Pins 2 | Closed |
| 1024 | | 3 closed | & 3 | |
| | | | closed | |
|------------+----------------+----------+---------+---------|
| 1024 x 768 | Non-interlaced | Pins 1 & | Pins 1 | Closed |
| | | 2 closed | & 2 | |
| | | | closed | |
|------------------------------------------------------------|
| Note: The last two settings require an optional dual |
| crystal and 512KB microcode EPROM. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECT |
|------------------------------------------------------------|
| 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 SELECT |
|------------------------------------------------------------|
| IRQ | S3 |
|----------------------------+-------------------------------|
| » | IRQ10 | Pins 3 & 4 closed |
|---+------------------------+-------------------------------|
| | IRQ9 | Pins 1 & 2 closed |
|---+------------------------+-------------------------------|
| | IRQ11 | Pins 5 & 6 closed |
|---+------------------------+-------------------------------|
| | IRQ12 | Pins 7 & 8 closed |
|---+------------------------+-------------------------------|
| | Disabled | Pins 9 & 10 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR CONNECTOR SENSE |
|------------------------------------------------------------|
| Connector Sense | J8 | J9 |
|--------------------------+----------------+----------------|
| » | Disabled | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed |
|---------+----------------+----------------+----------------|
| | Enabled | Pins 2 & 3 | Pins 2 & 3 |
| | | closed | closed |
|------------------------------------------------------------|
| Note: An optional microcode EPROM must be installed before |
| Connector Sense can be enabled. |
+------------------------------------------------------------+