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# AMERICAN MEGATRENDS, INC.
ENTERPRISE-IV EISA VLB
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium
Overdrive
Processor 25/33/50(internal)/50/66(internal)MHz
Speed
Chip Set AMI
Max. Onboard 256MB
DRAM
Cache 256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2), floppy drive
interface,
IDE interface, parallel port, serial ports (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| Serial port 1 | J2 | Power LED & | J34 |
| | | keylock | |
|--------------------+----------+-----------------+----------|
| Serial port 2 | J3 | Turbo switch | J39 |
|--------------------+----------+-----------------+----------|
| Parallel port | J4 | Speaker | J40 |
|--------------------+----------+-----------------+----------|
| IDE interface LED | J5 | Reset switch | J41 |
|--------------------+----------+-----------------+----------|
| Floppy drive | J6 | Turbo LED | J42 |
| interface | | | |
|--------------------+----------+-----------------+----------|
| IDE interface | J9 | 32-bit VESA | S1 |
| | | Local bus slot | |
|--------------------+----------+-----------------+----------|
| PS/2 mouse | J11 | 32-bit VESA | S2 |
| | | Local bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | J10 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J21 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | CPU low priority | J31 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | CPU high priority | J31 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J38 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 1 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select | SW1/switch 2 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| | Monitor type select color | SW1/switch 2 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+---------------+------------+-----------+-----------|
| 1MB | (1) 256K x 36 | None | None | None |
|-------+---------------+------------+-----------+-----------|
| 2MB | (1) 256K x 36 | (1) 256K x | None | None |
| | | 36 | | |
|-------+---------------+------------+-----------+-----------|
| 4MB | (1) 1M x 36 | None | None | None |
|-------+---------------+------------+-----------+-----------|
| 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | None |
| | | 36 | 36 | |
|-------+---------------+------------+-----------+-----------|
| 8MB | (1) 1M x 36 | (1) 1M x | None | None |
| | | 36 | | |
|-------+---------------+------------+-----------+-----------|
| 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+---------------+------------+-----------+-----------|
| 12MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | None |
| | | 36 | 36 | |
|-------+---------------+------------+-----------+-----------|
| 16MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+---------------+------------+-----------+-----------|
| 16MB | (1) 4M x 36 | None | None | None |
|-------+---------------+------------+-----------+-----------|
| 18MB | (1) 256K x 36 | (1) 256K x | (1) 4M x | None |
| | | 36 | 36 | |
|-------+---------------+------------+-----------+-----------|
| 20MB | (1) 1M x 36 | (1) 4M x | None | None |
| | | 36 | | |
|-------+---------------+------------+-----------+-----------|
| 24MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | None |
| | | 36 | 36 | |
|-------+---------------+------------+-----------+-----------|
| 32MB | (1) 4M x 36 | (1) 4M x | None | None |
| | | 36 | | |
|-------+---------------+------------+-----------+-----------|
| 36MB | (1) 1M x 36 | (1) 4M x | (1) 4M x | None |
| | | 36 | 36 | |
|-------+---------------+------------+-----------+-----------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+---------------+------------+-----------+-----------|
| 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | None |
| | | 36 | 36 | |
|-------+---------------+------------+-----------+-----------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+---------------+------------+-----------+-----------|
| 64MB | (1) 16M x 36 | None | None | None |
|-------+---------------+------------+-----------+-----------|
| 128MB | (1) 16M x 36 | (1) 16M x | None | None |
| | | 36 | | |
|-------+---------------+------------+-----------+-----------|
| 192MB | (1) 16M x 36 | (1) 16M x | (1) 16M x | None |
| | | 36 | 36 | |
|-------+---------------+------------+-----------+-----------|
| 256MB | (1) 16M x 36 | (1) 16M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J12 | J13 | J14 |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Open | Open |
|---------------+--------------+--------------+--------------|
| 33MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50i MHz | Open | Open | Open |
|---------------+--------------+--------------+--------------|
| 50MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 66i MHz | Open | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| PGA CPU | PQFP CPU | J15 | J16 | J43 |
|---------------+-----------------+--------+--------+--------|
| None | 80486SX,80486DX | N/A | N/A | Open |
|---------------+-----------------+--------+--------+--------|
| ODP486SX, | 80486SX,80486DX | 1&2, | pins 2 | Closed |
| 80487SX, | | 3&4 | & 3 | |
| ODP586SX | | | | |
|---------------+-----------------+--------+--------+--------|
| ODP486SX, | None | 1&2, | pins 2 | N/A |
| 80487SX, | | 3&4 | & 3 | |
| ODP586SX | | | | |
|---------------+-----------------+--------+--------+--------|
| 80486DX, | None | 1&2, | pins 1 | N/A |
| 80486DX2 | | 3&4 | & 2 | |
|---------------+-----------------+--------+--------+--------|
| 80486DX, | 80486SX,80486DX | 1&2, | pins 1 | Closed |
| 80486DX2 | | 3&4 | & 2 | |
|---------------+-----------------+--------+--------+--------|
| 80486SX | None | pins 2 | N/A | N/A |
| | | & 3 | | |
|---------------+-----------------+--------+--------+--------|
| 80486SX | 80486SX,80486DX | pins 2 | N/A | Closed |
| | | & 3 | | |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT INTERRUPT SELECTION |
|------------------------------------------------------------|
| Port 1 | Port 2 (J3) | J22 | J23 |
| (J2) | | | |
|------------+-------------+----------------+----------------|
| » | IRQ4 | IRQ3 | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
|----+-------+-------------+----------------+----------------|
| | IRQ3 | IRQ4 | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
+------------------------------------------------------------+