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# AMERICAN MEGATRENDS, INC.
SERIES 64 BABY EISA
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 128MB
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Mouse port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Mouse | J2 | Power LED & keylock | J30 |
|----------------+----------+---------------------+----------|
| Speaker | J22 | Reset switch | J31 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | CPU speed select iOSC/2 | J3 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | CPU speed select iOSC/1 | J3 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Channel ready signal | J29 | Open |
| | select IOCHRDY (ISA only) | | |
|---+---------------------------+---------------+------------|
| | Channel ready signal | J29 | Closed |
| | select EXRDY (EISA only) | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/1 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select | SW1/2 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| | Monitor type select color | SW1/2 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J14 | J15 | J18 | J19 | J28 |
|----------+----------+----------+---------+--------+--------|
| 64KB | Open | Open | Open | Open | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | Location | J9 |
|----------------+----------------+--------------------------|
| 80486SX | Primary | pins 2 & 3 closed |
|----------------+----------------+--------------------------|
| OPD486SX | Upgrade | pins 1 & 2, 3 & 4 closed |
|----------------+----------------+--------------------------|
| 80487SX | Upgrade | pins 1 & 2, 3 & 4 closed |
|----------------+----------------+--------------------------|
| 80486DX | Primary | pins 1 & 2, 3 & 4 closed |
|----------------+----------------+--------------------------|
| 80486DX2 | Primary | pins 1 & 2, 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J6 | J16 | J17 | J27 |
|----------+---------+---------+---------+-------------------|
| 20MHz | Closed | Open | Open | pins 2 & 3 closed |
|----------+---------+---------+---------+-------------------|
| 25MHz | Open | Open | Open | pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 33MHz | Open | Open | Closed | pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 50iMHz | Open | Open | Open | pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 50MHz | Open | Closed | Closed | pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 66iMHz | Open | Open | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+