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# FOCUS INFORMATION SYSTEMS, INC.
486IU
Processor 80486SX/80487SX/80486DX
Processor Speed 25/33/40/50MHz
Chip Set UMC
Max. Onboard DRAM 64MB
Cache 64/128/256/512/1024KB
BIOS AMI/MR
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J2 | Power LED & | J9 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo switch | J7 | Turbo LED | W14 |
|------------------+----------+-------------------+----------|
| Speaker | J8 | Reset switch | W15 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | J1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | J1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | W1 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | W1 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (4) 256K x | (4) 256K x | (4) 256K x | NONE |
| | 9 | 9 | 9 | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 256K x |
| | 9 | 9 | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (4) 256K x | (4) 1M x 9 | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 6MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------+-------------+-------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | W3 | W17 | W18 | W19 |
|-----------+--------+----------+--------------+-------------|
| 80486SX | Open | Open | Open | pins 2 & 3 |
| | | | | closed |
|-----------+--------+----------+--------------+-------------|
| 80487SX | Open | Closed | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
|-----------+--------+----------+--------------+-------------|
| 80486DX | Open | Closed | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
|------------------------------------------------------------|
| Note:When a 20MHz 80486SX CPU is used, W3 is closed and a |
| 40MHz clock is installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG (U25, | TAG (U36) |
| | | | U34, U35) | |
|--------+------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (3) 16K x | NONE |
| | | | 4 | |
|--------+------------+------------+------------+------------|
| 128KB | (4) 32K x | NONE | (3) 16K x | NONE |
| | 8 | | 4 | |
|--------+------------+------------+------------+------------|
| 256KB | (4) 32K x | (4) 32K x | (3) 16K x | NONE |
| | 8 | 8 | 4 | |
|--------+------------+------------+------------+------------|
| 512KB | (4) 128K x | NONE | (3) 64K x | (1) 64K x |
| | 8 | | 4 | 4 |
|--------+------------+------------+------------+------------|
| 1024KB | (4) 128K x | (4) 128K x | (3) 64K x | (1) 64K x |
| | 8 | 8 | 4 | 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W7 | W8 |W9 |W10 |W12 | W13 | W20 |W21 | W22 | W23 |
|------+----+----+---+----+----+------+-----+----+-----+-----|
| 64KB |1 & |1 & |1 &|1 & |1 & |Closed|1 & 2|2 & |Open |Open |
| | 2 | 2 | 2 | 2 | 2 | | | 3 | | |
|------+----+----+---+----+----+------+-----+----+-----+-----|
|128KB |1 & |1 & |2 &|1 & |1 & |Closed|2 & 3|1 & |Open |Open |
| | 2 | 2 | 3 | 2 | 2 | | | 2 | | |
|------+----+----+---+----+----+------+-----+----+-----+-----|
|256KB |1 & |2 & |2 &|1 & |1 & |Closed|1 & 2|2 & |Open |Open |
| | 2 | 3 | 3 | 2 | 2 | | | 3 | | |
|------+----+----+---+----+----+------+-----+----+-----+-----|
|512KB |2 & |2 & |2 &|2 & |1 & | Open |Open |1 & |2 & 3|1 & 2|
| | 3 | 3 | 3 | 3 | 2 | | | 2 | | |
|------+----+----+---+----+----+------+-----+----+-----+-----|
|1024KB|2 & |2 & |2 &|2 & |2 & | Open |Open |1 & |1 & 2|2 & 3|
| | 3 | 3 | 3 | 3 | 3 | | | 2 | | |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+