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# MODULAR CIRCUIT TECHNOLOGY
MCT-M486EV-66
Processor 80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed 25/33/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 128MB
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+----------------------+-----------|
| Turbo LED | J3 | Speaker | J6 |
|--------------+----------+----------------------+-----------|
| Turbo switch | J4 | Power LED & keylock | J7 |
|--------------+----------+----------------------+-----------|
| Reset switch | J5 | 32-bit VESA local | SL1 & SL2 |
| | | bus slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select monochrome | JP14 | Closed |
|---+----------------------------------+---------+-----------|
| | Monitor type select color | JP14 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 65MB | (4) 256K x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 65MB | (4) 16M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 68MB | (4) 1M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 68MB | (4) 16M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 80MB | (4) 4M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 80MB | (4) 16M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (4) 4K x 4 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (4) 4K x 4 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (4) 4K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 | JP10 | JP11 | JP12 | JP13 |
|--------+--------+--------+--------+--------+-------+-------|
| 64KB | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
|--------+--------+--------+--------+--------+-------+-------|
| 128KB | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|--------+--------+--------+--------+--------+-------+-------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 4 & 5 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP8 | JP9 |
|-------------------+--------------------+-------------------|
| 80486SX | pins 2 & 3 closed | Open |
|-------------------+--------------------+-------------------|
| 80486DX | pins 1 & 2, 3 & 4 | pins 1 & 2 closed |
| | closed | |
|-------------------+--------------------+-------------------|
| 80486DX2 | pins 1 & 2, 3 & 4 | pins 1 & 2 closed |
| | closed | |
|-------------------+--------------------+-------------------|
| Pentium Overdrive | pins 1 & 2, 3 & 4 | pins 2 & 3 closed |
| | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP6 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP5 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+