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# FIRST INTERNATIONAL COMPUTER, INC.
486-20/25/33/50SC (REV. A)
Processor 80486SX/80486DX
Processor Speed 20/25/33/50MHz
Chip Set Symphony
Max. Onboard DRAM 32MB
Cache 64/128/256/1024KB
BIOS AMI
Dimensions 330.2mm x 218.4mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Turbo switch | JP12 | Speaker | JP18 |
|----------------+----------+---------------------+----------|
| Turbo LED | JP14 | Power LED & keylock | JP19 |
|----------------+----------+---------------------+----------|
| Reset switch | JP17 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | JP4 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | CPU speed select iOSC/2 | JP5/6 | Off |
|---+---------------------------+---------------+------------|
| | CPU speed select iOSC/1 | JP5/6 | On |
|---+---------------------------+---------------+------------|
| » | Monitor type select | JP5/8 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| | Monitor type select color | JP5/8 | On |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | JP20 | pins 1 & 2 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | JP21 | pins 1 & 2 |
| | not 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) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M 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 |
|------------------------------------------------------------|
| Size |JP3 |JP6 | JP7 |JP8 |JP9 |JP10 |JP11 |JP13 |JP15|JP16|
|------+----+----+-----+----+----+-----+-----+-----+----+----|
| 64KB |1 & |2 & |1 & 2|2 & |1 & |1 & 2|1 & 2|2 & 3|2 & |2 & |
| | 2 | 3 | | 3 | 2 | | | | 3 | 3 |
|------+----+----+-----+----+----+-----+-----+-----+----+----|
|128KB |1 & |1 & |Open |1 & |1 & |1 & 2|2 & 3|open |1 & |1 & |
| | 2 | 2 | | 2 | 2 | | | | 2 | 2 |
|------+----+----+-----+----+----+-----+-----+-----+----+----|
|256KB |1 & |2 & |2 & 3|2 & |1 & |2 & 3|2 & 3|2 & 3|2 & |2 & |
| | 2 | 3 | | 3 | 2 | | | | 3 | 3 |
|------+----+----+-----+----+----+-----+-----+-----+----+----|
|1024KB|2 & |2 & |2 & 3|2 & |2 & |2 & 3|2 & 3|2 & 3|2 & |2 & |
| | 3 | 3 | | 3 | 3 | | | | 3 | 3 |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5/3 | JP5/4 | JP5/5 | JP5/7 |
|---------+------------+------------+------------+-----------|
| 64KB | Off | Off | Off | On |
|---------+------------+------------+------------+-----------|
| 128KB | On | On | On | Off |
|---------+------------+------------+------------+-----------|
| 256KB | Off | Off | Off | On |
|---------+------------+------------+------------+-----------|
| 1024KB | Off | Off | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP2 | JP5/1 | JP5/2 |
|--------------+-------------------+------------+------------|
| 80486SX | pins 2 & 3 closed | Off | Off |
|--------------+-------------------+------------+------------|
| 80486DX | pins 1 & 2 closed | On | On |
+------------------------------------------------------------+