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# ORCHID TECHNOLOGY
TURBO PGA
Category Video
Video Types Supported CGA
Video Processor Unidentified
Highest Resolution Supported 720 x 350
Data Bus Type 16-bit ISA
Memory Type Unidentified
Maximum Onboard Memory Unidentified
IMG IMG 1
+------------------------------------------------------------+
| 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 | Pins 1 & 2 |
| | closed | closed |
|----------------------+------------------+------------------|
| IBM/Hercules | Pins 1 & 2 | Pins 2 & 3 |
| monochome | closed | closed |
|----------------------+------------------+------------------|
| Hsync positive | Pins 1 & 2 | N/A |
| | closed | |
|----------------------+------------------+------------------|
| Hsync negative | Pins 2 & 3 | N/A |
| | closed | |
|----------------------+------------------+------------------|
| Vsync positive | N/A | Pins 1 & 2 |
| | | closed |
|----------------------+------------------+------------------|
| Vsync negative | N/A | Pins 2 & 3 |
| | | closed |
|----------------------+------------------+------------------|
| Composite sync | Pins 1 & 2 | All open |
| positive | closed | |
|----------------------+------------------+------------------|
| Composite sync | Pins 2 & 3 | All open |
| negative | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+