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# AMERICAN MEGATRENDS, INC.
ENTERPRISE III (VERSION 2)
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/ODP586SX
Processor 20/25/33/50(internal)/50/66(internal)
Speed
Chip Set AMI
Max. 256MB
Onboard
DRAM
Cache 256KB
BIOS AMI
Dimensions 355mm x 304mm
I/O Options 32-bit VESA local bus slots (2), PS/2 mouse port
(2)
NPU Options NONE
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| Turbo LED | D5 | Power LED & | J10 |
| | | keylock | |
|-----------------+----------+--------------------+----------|
| Diagnostic LED | J1 | Turbo switch | J14 |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | J3 | 10-pin PS/2 mouse | J100 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Speaker | J8 | 32-bit VESA Local | S1 |
| | | bus slot | |
|-----------------+----------+--------------------+----------|
| Reset switch | J9 | 32-bit VESA Local | S2 |
| | | bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-----------------------------+---------------+--------------|
| » | Flash BIOS disabled | J2 | Open |
|---+-------------------------+---------------+--------------|
| | Flash BIOS enabled | J2 | Closed |
|---+-------------------------+---------------+--------------|
| » | CPU type select 80486DX | J7 | Pins 1 & 2, |
| | | | 3 & 4 closed |
|---+-------------------------+---------------+--------------|
| | CPU type select 80486SX | J7 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------+---------------+--------------|
| » | PS/2 mouse enabled | J12 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------+---------------+--------------|
| | PS/2 mouse disabled | J12 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------+---------------+--------------|
| » | CPU priority select low | J19 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------+---------------+--------------|
| | CPU priority select | J19 | Pins 2 & 3 |
| | high | | closed |
|---+-------------------------+---------------+--------------|
| » | Local bus ID >=33MHz | J30 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------+---------------+--------------|
| | Local bus ID <=33MHz | J30 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------+---------------+--------------|
| » | Factory configured - do | SW1/1 | Off |
| | not alter | | |
|---+-------------------------+---------------+--------------|
| | Monitor type select | SW1/2 | Off |
| | monochrome | | |
|---+-------------------------+---------------+--------------|
| | Monitor type select CGA | SW1/2 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 6MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|-------+-------------+------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 18MB | (4) 256K x | (4) 256K x | (4) 4M x 9 | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|-------+-------------+------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|-------+-------------+------------+------------+------------|
| 64MB | (4) 16M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 128MB | (4) 16M x 9 | (4) 16M x | NONE | NONE |
| | | 9 | | |
|-------+-------------+------------+------------+------------|
| 192MB | (4) 16M x 9 | (4) 16M x | (4) 16M x | NONE |
| | | 9 | 9 | |
|-------+-------------+------------+------------+------------|
| 256MB | (4) 16M x 9 | (4) 16M x | (4) 16M x | (4) 16M x |
| | | 9 | 9 | 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECT |
|------------------------------------------------------------|
| Speed | J20 | J21 | J24 |
|---------------+---------------+--------------+-------------|
| 20MHz | Closed | Open | Open |
|---------------+---------------+--------------+-------------|
| 25MHz | Open | Open | Open |
|---------------+---------------+--------------+-------------|
| 33MHz | Open | Open | Open |
|---------------+---------------+--------------+-------------|
| 50I Mhz | Open | Open | Open |
|---------------+---------------+--------------+-------------|
| 50MHz | Open | Open | Open |
|---------------+---------------+--------------+-------------|
| 66I MHz | Open | Open | Open |
+------------------------------------------------------------+