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# UNIDENTIFIED
ISA-S486B
Processor 80486SX/80486DX/80486DX2
Processor Speed 16/20/25/33/50(internal)/50MHz
Chip Set Symphony
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Power LED & keylock | JP5 | Speaker | JP16 |
|---------------------+----------+----------------+----------|
| Turbo switch | JP10 | Reset switch | JP19 |
|---------------------+----------+----------------+----------|
| Turbo LED | JP11 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|---------------------------------------+---------+----------|
| » | Factory configured - do not alter | JP1 | N/A |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | JP2 | N/A |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | JP3 | N/A |
|---+-----------------------------------+---------+----------|
| » | Monitor type select color | JP6 | Closed |
|---+-----------------------------------+---------+----------|
| | Monitor type select monochrome | JP6 | Open |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | JP8 | N/A |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | JP9 | N/A |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | JP33 | N/A |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | JP35 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 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) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M 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) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP22 | JP23 | JP34 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | JP100 | JP101 |
|-------+--------------------------+-------------------------|
| 64KB | pins 1 & 3, 5 & 7, 9 & | pins 1 & 3, 5 & 7, 9 & |
| | 11, 13 & 15 closed | 11, 13 & 15 closed |
|-------+--------------------------+-------------------------|
| 128KB | pins 2 & 4, 6 & 8, 10 & | pins 2 & 4, 6 & 8, 10 & |
| | 12, 14 & 16 closed | 12, 14 & 16 closed |
|-------+--------------------------+-------------------------|
| 256KB | pins 1 & 3, 5 & 7, 9 & | pins 1 & 3, 5 & 7, 9 & |
| | 11, 13 & 15 closed | 11, 13 & 15 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP12 | JP13 | JP14 |
|--------------+------------+-------------------+------------|
| 80486SX | Open | pins 2 & 3 closed | Open |
|--------------+------------+-------------------+------------|
| 80486DX | Closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+