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# TWINHEAD INTERNATIONAL CORPORATION
CT-6280
Card Type Memory card
Chip Set Unidentified
Maximum Onboard Memory 640KB
Data Bus 8-bit ISA
IMG IMG 1
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| ยป | Factory configured - do not | SW1/7 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Parity check enabled | SW1/8 | On |
|---+---------------------------------+-------+--------------|
| | Parity check disabled | SW1/8 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 | Bank 3 |
|-------------+------------------+-------------+-------------|
| 0KB | None | None | None |
|-------------+------------------+-------------+-------------|
| 64KB | 64KB | None | None |
|-------------+------------------+-------------+-------------|
| 128KB | 64KB | 64KB | None |
|-------------+------------------+-------------+-------------|
| 192KB | 64KB | 64KB | 64KB |
|-------------+------------------+-------------+-------------|
| 256KB | 256KB | None | None |
|-------------+------------------+-------------+-------------|
| 320KB | 256KB | 64KB | None |
|-------------+------------------+-------------+-------------|
| 384KB | 256KB | 64KB | 64KB |
|-------------+------------------+-------------+-------------|
| 448KB | 256KB | 256KB | None |
|-------------+------------------+-------------+-------------|
| 512KB | 256KB | 256KB | None |
|-------------+------------------+-------------+-------------|
| 576KB | 256KB | 256KB | 64KB |
|-------------+------------------+-------------+-------------|
| 640KB | 256KB | 256KB | 256KB |
|------------------------------------------------------------|
| Note: It is recommended that 4164 or 4125 RAM chips of |
| 150ns or faster be used. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
|------------+-----------+-----------+-----------+-----------|
| 0KB | Off | Off | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 64KB | On | Off | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 128KB | Off | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 192KB | On | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 256KB | Off | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 320KB | On | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 384KB | Off | On | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 448KB | On | On | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 512KB | Off | Off | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 576KB | On | Off | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 640KB | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| STARTING ADDRESS SELECTION |
|------------------------------------------------------------|
| Address | SW1/1 | SW1/2 |
|--------------------+-------------------+-------------------|
| 00000h (0KB) | Off | Off |
|--------------------+-------------------+-------------------|
| 10000h (64KB) | On | Off |
|--------------------+-------------------+-------------------|
| 20000h (128KB) | Off | On |
|--------------------+-------------------+-------------------|
| 40000h (256KB) | On | On |
+------------------------------------------------------------+