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# FIRST INTERNATIONAL COMPUTER, INC.
486SX-20 & DX-25/33 SC (REV. D)
Processor 80486SX/80486DX
Processor Speed 20/25/33MHz
Chip Set Symphony
Max. Onboard DRAM 32MB
Cache 64/128/256/1024KB
BIOS AMI/MR/Phoenix
Dimensions 355mm x 304mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | JP1 | Turbo switch | JP10 |
|---------------------+----------+----------------+----------|
| Reset switch | JP2 | Turbo LED | JP11 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | JP5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP6 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP6 | Closed |
|---+----------------------------------+--------+------------|
| » | CPU speed select iOSC/1 | JP27 | Closed |
|---+----------------------------------+--------+------------|
| » | CPU speed select iOSC/2 | JP27 | Open |
|---+----------------------------------+--------+------------|
| » | Cache write select 0 wait states | JP32 | Closed |
|---+----------------------------------+--------+------------|
| | Cache write select 1 wait state | JP32 | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP33 | pins 2 & 3 |
| | alter | | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 1024KB | (4) 128K x 8 | (4) 128K x 8 | (1) 128K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | JP22 | JP23 | JP24 | JP25 | JP26 |
|----------+----------+----------+--------+--------+---------|
| 64KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | Open |
|----------+----------+----------+--------+--------+---------|
| 128KB | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | Closed |
|----------+----------+----------+--------+--------+---------|
| 256KB | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | Open |
|----------+----------+----------+--------+--------+---------|
| 1MB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | JP28 | JP34 | JP35 | JP36 | JP37 |
|----------+----------+----------+---------+--------+--------|
| 64KB | Closed | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 128KB | Open | Open | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 256KB | Closed | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 1MB | Closed | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | JP38 | JP39 | JP40 | JP41 | JP42 |
|----------+----------+---------+---------+---------+--------|
| 64KB | Open | 2 & 3 | 2 & 3 | Open | 2 & 3 |
|----------+----------+---------+---------+---------+--------|
| 128KB | Closed | Open | 1 & 2 | Closed | 2 & 3 |
|----------+----------+---------+---------+---------+--------|
| 256KB | Open | 2 & 3 | 2 & 3 | Open | 2 & 3 |
|----------+----------+---------+---------+---------+--------|
| 1MB | Open | 2 & 3 | 2 & 3 | Open | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP12 | JP13 | JP14 |
|--------------+------------+-------------------+------------|
| 80486SX | Open | pins 2 & 3 closed | Open |
|--------------+------------+-------------------+------------|
| 80486DX | Closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+