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# ACHME COMPUTER, INC.
MS-4131 VLB 486 AL2
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 25/33/40/50(internal)/50/66(internal)MHz
Chip Set ALI
Max. Onboard DRAM 112MB
Cache 128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | JB | 32-bit VESA | S2 |
| | | Local bus slot | |
|---------------------+----------+----------------+----------|
| 32-bit VESA Local | S1 | 32-bit VESA | S3 |
| bus slot | | Local bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PIN OUT CONFIGURATION |
|------------------------------------------------------------|
| Connector | JFP |
|----------------------------+-------------------------------|
| Keylock | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Power LED | pins 3 & 5 closed |
|----------------------------+-------------------------------|
| Turbo LED | pins 12 & 13 closed |
|----------------------------+-------------------------------|
| Turbo switch | pins 15, 16, & 17 closed |
|----------------------------+-------------------------------|
| Reset | pins 19 & 20 closed |
|----------------------------+-------------------------------|
| Speaker | pins 7, 8, 9, & 10 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JC1 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JC2 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JC3 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JC5 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JC7 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | CPU PQFP not installed | JC8 | Closed |
|---+----------------------------------+--------+------------|
| | CPU PQFP installed | JC8 | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JC9 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JC10 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------+-------------+-------------+------------------------|
| 128KB | (4) 32K x 8 | NONE | (1)8K x 8/(1)16K x |
| | | | 8/(1)32K x 8 |
|-------+-------------+-------------+------------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8/(1) 32K x |
| | | | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JS1 | JS2 |
|------------------+--------------------+--------------------|
| 64KB | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 128KB | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JC4 | JC6 |
|------------------+--------------------+--------------------|
| 80486SX | pins 1 & 2 closed | Open |
|------------------+--------------------+--------------------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX2 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JK1 | JK2 | JK3 | JK4 | JP2 |
|---------+------------+----------+--------+--------+--------|
| 25MHz | 3 & 7 and | pins 1 & | pins 1 | Closed | pins 1 |
| | 4 & 8 | 2 | & 2 | | & 2 |
|---------+------------+----------+--------+--------+--------|
| 33MHz | 1 & 2 and | pins 1 & | pins 1 | Closed | pins 1 |
| | 4 & 8 | 2 | & 2 | | & 2 |
|---------+------------+----------+--------+--------+--------|
| 40MHz | 1 & 5 and | pins 2 & | pins 2 | Closed | pins 2 |
| | 2 & 6 | 3 | & 3 | | & 3 |
|---------+------------+----------+--------+--------+--------|
| 50i MHz | 3 & 7 and | pins 1 & | pins 1 | Closed | pins 1 |
| | 4 & 8 | 2 | & 2 | | & 2 |
|---------+------------+----------+--------+--------+--------|
| 50MHz | pins 2 & 6 | pins 2 & | pins 2 | Open | pins 2 |
| | | 3 | & 3 | | & 3 |
|---------+------------+----------+--------+--------+--------|
| 66i MHz | 1 & 2 and | pins 1 & | pins 1 | Closed | pins 1 |
| | 4 & 8 | 2 | & 2 | | & 2 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JP4/pins 1 & 2 | JP4/pins 3 & |
| | | | 4 |
|-----------+---------------+----------------+---------------|
| <= 33MHz | 0 wait states | Open | Open |
|-----------+---------------+----------------+---------------|
| > 33MHz | 1 wait state | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | None | None |
|------------+---------------+---------------+---------------|
| 4MB | None | (1) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 4MB | None | None | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | None | None |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | None | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | None | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | None | (1) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 8MB | None | None | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 256K x 9 | (1) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 9MB | (4) 256K x 9 | None | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | None | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | None | None |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | (1) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 16MB | None | (1) 2M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | None | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 4M x 9 | (1) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 24MB | (4) 4M x 9 | None | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | None | (1) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 32MB | None | None | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | (1) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | None | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | None | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | None | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CONT.) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 64MB | None | (1) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 64MB | None | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | None | None | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 65MB | (4) 256K x 9 | None | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 65MB | (4) 256K x 9 | (1) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 68MB | (4) 1M x 9 | (1) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 68MB | (4) 1M x 9 | None | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 88MB | (4) 4M x 9 | None | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 88MB | (4) 4M x 9 | (1) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 96MB | None | (1) 8M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 97MB | (4) 256K x 9 | (1) 8M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 100MB | (4) 1M x 9 | (1) 8M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 112MB | (4) 4M x 9 | (1) 8M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+