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# EVEREX SYSTEMS, INC.
STEP 386SX20 GATE ARRAY EV-18107C
Processor 80386SX
Processor 20MHz
Speed
Chip Set C & T
Max. onboard 16MB
DRAM
Cache 64KB
BIOS AMI
Dimensions 355mm x 304mm
I/O Options Floppy drive interface, IDE interface, parallel
port, serial ports (2)
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Parallel port | J7 | Floppy drive | U100 |
| | | interface | |
|------------------+----------+-------------------+----------|
| IDE interface | J8 | Serial port 2 | U106 |
|------------------+----------+-------------------+----------|
| Speaker | JP2 | Serial port 1 | U107 |
|------------------+----------+-------------------+----------|
| External battery | JP9 | LED connector | LED |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+--------+-------------|
| » | Cache LED disabled | J3 | Closed |
|---+---------------------------------+--------+-------------|
| | Cache LED enabled | J3 | Open |
|---+---------------------------------+--------+-------------|
| » | BIOS type select 27256 | JP8 | Open |
|---+---------------------------------+--------+-------------|
| | BIOS type select 27512 | JP8 | Closed |
|---+---------------------------------+--------+-------------|
| » | Floppy drive interface enabled | JP9 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | Floppy drive interface disabled | JP9 | pins 3 & 4 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (2) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 1MB | (2) 256K x 9 | (2) 256K x 9 |
|------------------+--------------------+--------------------|
| 2MB | (2) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 2.5MB | (2) 256K x 9 | (2) 1M x 9 |
|------------------+--------------------+--------------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (2) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8.5MB | (2) 256K x 9 | (2) 4M x 9 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 9 | (2) 4M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (2) 4M x 9 | (2)4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ONBOARD SERIAL/PARALLEL CONFIGURATION |
|------------------------------------------------------------|
| Port | Connector | IRQ | Address |
|-------------+-----------------+------------+---------------|
| COM1 | U107 | IRQ4 | 3F8h |
|-------------+-----------------+------------+---------------|
| COM2 | U106 | IRQ3 | 2F8h |
|-------------+-----------------+------------+---------------|
| LPT2 | J7 | IRQ7 | 378h |
|------------------------------------------------------------|
| Note:The onboard serial & parallel port configurations are |
| fixed and cannot be altered or disabled. |
+------------------------------------------------------------+