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# TANDON CORPORATION
TOWER486
Processor 80486SX
Processor 25/33MHz
Speed
Chip Set Unidentified
Max. Onboard 64MB (4MB or 8MB installed on board)
DRAM
Cache None
BIOS Unidentified
Dimensions 355mm x 305mm
I/O Options External memory card, floppy drive interface, IDE
interface
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface | CN1 | External battery | J8 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN2 | External memory | SL1 |
| interface | | card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|----------------------------------------+--------+----------|
| » | 256KB - 512KB memory override | SW1/1 | Off |
| | disabled | | |
|---+------------------------------------+--------+----------|
| | 256KB - 512KB memory override | SW1/1 | On |
| | enabled | | |
|---+------------------------------------+--------+----------|
| » | 512KB - 640KB memory override | SW1/2 | Off |
| | disabled | | |
|---+------------------------------------+--------+----------|
| | 512KB - 640KB memory override | SW1/2 | On |
| | enabled | | |
|---+------------------------------------+--------+----------|
| » | Security enabled | SW1/3 | Off |
|---+------------------------------------+--------+----------|
| | Security disabled | SW1/3 | On |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/4 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (EXTERNAL CARD) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|--------------+-----------------------+---------------------|
| 2MB | (8) 256K x 9 | NONE |
|--------------+-----------------------+---------------------|
| 4MB | (8) 256K x 9 | (8) 256K x 9 |
|--------------+-----------------------+---------------------|
| 8MB | (8) 1M x 9 | NONE |
|--------------+-----------------------+---------------------|
| 10MB | (8) 1M x 9 | (8) 256K x 9 |
|--------------+-----------------------+---------------------|
| 16MB | (8) 1M x 9 | (8) 1M x 9 |
|--------------+-----------------------+---------------------|
| 32MB | (8) 4M x 9 | NONE |
|--------------+-----------------------+---------------------|
| 34MB | (8) 4M x 9 | (8) 256K x 9 |
|--------------+-----------------------+---------------------|
| 40MB | (8) 4M x 9 | (8) 1M x 9 |
|--------------+-----------------------+---------------------|
| 64MB | (8) 4M x 9 | (8) 4M x 9 |
|------------------------------------------------------------|
| Note: Board is factory installed with either 4MB or |
| 8MB. The location of the memory is unidentified. If |
| memory card is installed, the on board memory is |
| disabled. |
+------------------------------------------------------------+