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# UNIDENTIFIED
MST 486A GENERATION STANDARD
Processor 80486DX
Processor Speed 25MHz
Chip Set OPTI
Max. Onboard DRAM 16MB
SRAM Cache 128KB
BIOS AMI
Dimensions 330mm x 220mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | Reset switch | J4 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J2 | External battery | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| ยป | Monitor type select Color | JP1 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Monitor type select | JP1 | pins 2 & 3 |
| | Monochrome | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | Bank |
| | | | | | Type |
|------+--------------+----------+---------+---------+-------|
| 1MB | (4) 256K x 9 | NONE | NONE | NONE | A |
|------+--------------+----------+---------+---------+-------|
| 2MB | (4) 256K x 9 | (4) 256K | NONE | NONE | A |
| | | x 9 | | | |
|------+--------------+----------+---------+---------+-------|
| 3MB | (4) 256K x 9 | (4) 256K | (4) | NONE | A |
| | | x 9 | 256K x | | |
| | | | 9 | | |
|------+--------------+----------+---------+---------+-------|
| 4MB | NONE | NONE | NONE | (36) | B |
| | | | | 411000 | |
|------+--------------+----------+---------+---------+-------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE | A |
|------+--------------+----------+---------+---------+-------|
| 5MB | (4) 256K x 9 | (4) 1M x | NONE | NONE | A |
| | | 9 | | | |
|------+--------------+----------+---------+---------+-------|
| 6MB | (4) 256K x 9 | (4) 256K | (4) 1M | NONE | A |
| | | x 9 | x 9 | | |
|------+--------------+----------+---------+---------+-------|
| 7MB | (4) 256K x 9 | (4) 256K | (4) | (36) | B |
| | | x 9 | 256K x | 411000 | |
| | | | 9 | | |
|------+--------------+----------+---------+---------+-------|
| 8MB | (4) 1M x 9 | (4) 1M x | NONE | NONE | A |
| | | 9 | | | |
|------+--------------+----------+---------+---------+-------|
| 9MB | (4) 1M x 9 | (4) 1M x | (4) | NONE | A |
| | | 9 | 256K x | | |
| | | | 9 | | |
|------+--------------+----------+---------+---------+-------|
| 10MB | (4) 256K x 9 | (4) 256K | (4) 1M | (36) | B |
| | | x 9 | x 9 | 411000 | |
|------+--------------+----------+---------+---------+-------|
| 12MB | (4) 1M x 9 | (4) 1M x | (4) 1M | NONE | A |
| | | 9 | x 9 | | |
|------+--------------+----------+---------+---------+-------|
| 13MB | (4) 256k x 9 | (4) 1M x | (4) 1M | (36) | B |
| | | 9 | x 9 | 411000 | |
|------+--------------+----------+---------+---------+-------|
| 16MB | (4) 1 M x 9 | (4) 1M x | (4) 1M | (36) | B |
| | | 9 | x 9 | 411000 | |
|------------------------------------------------------------|
IMG IMG 2
| |
|------------------------------------------------------------|
| Note: pins are shown in the closed position |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache |
|----------------------------+-------------------------------|
| 128KB | (16) 8K x 8 |
+------------------------------------------------------------+