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# EVEREX SYSTEMS, INC.
SYSTEM 3900 (EV-1851)
Processor 80386DX
Processor Speed 25/33MHz
Chip Set C & T
Max. Onboard DRAM 8MB
Cache 64KB
BIOS AMI
Dimensions 355mm x 304mm
I/O Options 32-bit external memory card slot
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Speaker | J17 | Keylock | J18 pin |
| | | | 9 |
|--------------+----------+-----------------------+----------|
| Power LED | J18 pin | External battery | J22 |
| | 1 | connector | |
|--------------+----------+-----------------------+----------|
| Turbo LED | J18 pin | Speaker | J23 |
| | 2 | enable/disable switch | |
|--------------+----------+-----------------------+----------|
| Reset switch | J18 pin | 32-bit external | S1 |
| | 6 | memory card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | DRAM speed select 4 wait states | J15 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | DRAM speed select 3 wait states | J15 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | NPU mode select 1 wait state | J16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | NPU mode select 0 wait states | J16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J19 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 256K x | (4) 256K x | (4) 256K x | (4) 256K x |
| | 9 | 9 | 9 | 9 |
|-------+-------------+------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------------------------------------------------------------|
| Note:Banks 2 & 3 are used when a 32-bit external memory |
| card is installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 64KB | (8) 64K x 1 |
|------------------------------------------------------------|
| Note:Cache is factory installed and is not configurable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CMOS CONFIGURATION |
|------------------------------------------------------------|
| Setting | W1 | W2 | W3 | W4 | W5 | W6 | W7 | W8 |
|----------+------+------+-----+-----+-----+-----+-----+-----|
| Internal | 2 & | 2 & | 2 & | 2 & | 2 & | 2 & | 2 & | 2 & |
| | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
|----------+------+------+-----+-----+-----+-----+-----+-----|
| External | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & |
| | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+