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# UNIDENTIFIED
486TC4
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33MHz
Chip Set C & T
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | JP2 | Turbo LED | JP10 |
|-------------------+----------+------------------+----------|
| Speaker | JP7 | Turbo switch | JP11 |
|-------------------+----------+------------------+----------|
| Power LED & | JP8 | 32-bit external | S1 |
| keylock | | memory card | |
|-------------------+----------+------------------+----------|
| Reset switch | JP9 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J3 | unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J4 | unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Battery select internal | JP1 | closed |
|---+----------------------------------+--------+------------|
| | Battery select external | JP1 | open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP3 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP15 | unknown |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP12 | JP13 | JP16 |
|----------+-------------------+-------------------+---------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed | closed |
|----------+-------------------+-------------------+---------|
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed | closed |
|----------+-------------------+-------------------+---------|
| 80486SX | pins 2 & 3 closed | pins 1 & 2 closed | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 64KB | 128KB | 256KB |
|--------+-----------------+----------------+----------------|
| SR1 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR4 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR5 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR6 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR7 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR8 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR9 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR10 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| SR11 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG (U35) | TAG (U37) |
|-------+------------+-------------+------------+------------|
| 32KB | (4) 8K x 8 | Bank 0 | (1) 8K x 8 | NONE |
|-------+------------+-------------+------------+------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 | (1) 8K x 8 |
|-------+------------+-------------+------------+------------|
| 128KB | (4) 32K x | Bank 0 | (1) 8K x 8 | NONE |
| | 8 | | | |
|-------+------------+-------------+------------+------------|
| 256KB | (8) 32K x | Banks 0 & 1 | (1) 8K x 8 | (1) 8K x 8 |
| | 8 | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | JP6 |
|--------+---------------+---------------+-------------------|
| 1MB | (4) 256K x 9 | NONE | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 4MB | (4) 1M x 9 | NONE | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 | pins 2 & 3 closed |
|--------+---------------+---------------+-------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 16MB | (4) 4M x 9 | NONE | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 | pins 2 & 3 closed |
|--------+---------------+---------------+-------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 | pins 2 & 3 closed |
|--------+---------------+---------------+-------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | pins 1 & 2 closed |
+------------------------------------------------------------+