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# ADVANCED COMPUTER TECHNOLOGY, LTD.
T486SX-20/T486DX-25/T486DX-33
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33MHz
Chip Set ACT
Max. Onboard DRAM 32MB
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Power LED & Keylock | JP22 | Speaker | JP28 |
|---------------------+----------+----------------+----------|
| Reset switch | JP24 | Turbo switch | JP30 |
|---------------------+----------+----------------+----------|
| External battery | JP25 | Turbo LED | JP31 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-----------------------------------+-----------+------------|
| » | RAM speed select fast (40 to | JP4 & JP5 | pins 1 & 2 |
| | 70ns) | | closed |
|---+-------------------------------+-----------+------------|
| | RAM speed select slow (80 to | JP4 & JP5 | pins 2 & 3 |
| | 120ns) | | closed |
|---+-------------------------------+-----------+------------|
| » | Video BIOS cacheable | JP7 | pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| | Video BIOS non-cacheable | JP7 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| » | Factory configured - do not | JP11 | N/A |
| | alter | | |
|---+-------------------------------+-----------+------------|
| » | Monitor type select color | JP23 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| | Monitor type select | JP23 | pins 1 & 2 |
| | monochrome | | closed |
|---+-------------------------------+-----------+------------|
| » | Battery select internal | JP26 | pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| | Battery select external | JP26 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| » | Power good signal detect from | JP27 | pins 1 & 2 |
| | power supply | | closed |
|---+-------------------------------+-----------+------------|
| | Power good signal detect from | JP27 | pins 2 & 3 |
| | board | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 |
|------+-----------------+-----------------+-----------------|
| 1MB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 2MB | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 4MB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 8MB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 16MB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 32MB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP2 | JP3 | JP6 | JP12 |
|------------+-----------+-----------+-----------+-----------|
| 80486SX - | pins 1 & | pins 1 & | pins 1 & | pins 1 & |
| 20MHz | 2 closed | 2 closed | 2 closed | 2 closed |
|------------+-----------+-----------+-----------+-----------|
| 80486SX - | pins 2 & | pins 1 & | pins 1 & | pins 1 & |
| 33MHz | 3 closed | 2 closed | 2 closed | 2 closed |
|------------+-----------+-----------+-----------+-----------|
| 80487SX - | pins 1 & | pins 1 & | pins 2 & | pins 2 & |
| 20MHz | 2 closed | 2 closed | 3 closed | 3 closed |
|------------+-----------+-----------+-----------+-----------|
| 80486DX - | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| 25/33 MHz | 3 closed | 3 closed | 3 closed | 3 closed |
+------------------------------------------------------------+