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# ZYTEX COMPUTERS, INC.
TB486
Processor 80486DX
Processor Speed 33MHz
Chip Set ETEQ
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI/MR
Dimensions 330.2mm x 218.4mm
I/O OPTIONS 32-bit external memory card slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------------+----------+-------------+----------|
| Reset switch | J4 | Power LED & | JP26 |
| | | Keylock | |
|------------------------+----------+-------------+----------|
| External battery | JP2 | Speaker | JP27 |
|------------------------+----------+-------------+----------|
| 32-bit external memory | JP5 | Turbo LED | T1 |
| card | | | |
|------------------------+----------+-------------+----------|
| Turbo switch | JP25 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Monitor type select monochrome | J4 | Open |
|---+------------------------------------+--------+----------|
| | Monitor type select color | J4 | Closed |
|---+------------------------------------+--------+----------|
| » | Filter circuitry disabled | JP3 | Closed |
|---+------------------------------------+--------+----------|
| | Filter circuitry enabled | JP3 | Open |
|---+------------------------------------+--------+----------|
| » | NPU read speed select 3 wait | JP24 | Open |
| | states | | |
|---+------------------------------------+--------+----------|
| | NPU read speed select 2 wait | JP24 | Closed |
| | states | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (2) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (2) 8K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP19 | JP20 | JP21 | JP22 | JP23 |
|-------+-------------+-----------+--------+--------+--------|
| 64KB | pins 2 & 3 | pins 2 & | Open | Open | Open |
| | closed | 3 closed | | | |
|-------+-------------+-----------+--------+--------+--------|
| 256KB | pins 1 & 2 | pins 1 & | Closed | Closed | Closed |
| | closed | 2 closed | | | |
+------------------------------------------------------------+