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# EVEREX SYSTEMS, INC.
STEP 386/20 REV.E (EV-1816A)
Processor 80386DX
Processor Speed 20MHz
Chip Set C & T
Max. Onboard DRAM 8MB
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card
NPU Options 80387DX
IMG IMG 1
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Monitor select color | C/M | Closed |
|---+------------------------------------+--------+----------|
| | Monitor select monochrome | C/M | Open |
|---+------------------------------------+--------+----------|
| » | NPU enabled | W3 | Closed |
|---+------------------------------------+--------+----------|
| | NPU disabled | W3 | Open |
|---+------------------------------------+--------+----------|
| » | External memory card disabled | W14 | Closed |
|---+------------------------------------+--------+----------|
| | External memory card enabled | W14 | Open |
|---+------------------------------------+--------+----------|
| » | Base memory select 512KB | W16 | Closed |
|---+------------------------------------+--------+----------|
| | Base memory select 640KB | W16 | Open |
|---+------------------------------------+--------+----------|
| » | Bus speed select 6.7MHz | W17 | Closed |
|---+------------------------------------+--------+----------|
| | Bus speed select 10MHz | W17 | Open |
|---+------------------------------------+--------+----------|
| » | External memory card parity | W20 | Closed |
| | checking disabled | | |
|---+------------------------------------+--------+----------|
| | External memory card parity | W20 | Open |
| | checking disabled | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Mainboard | Total | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
| mem. | memory | | | | |
|------------+---------+---------+---------+--------+--------|
| 1MB | 1MB | (4) | NONE | NONE | NONE |
| | | 256K x | | | |
| | | 9 | | | |
|------------+---------+---------+---------+--------+--------|
| 2MB | 2MB | (4) | (4) | NONE | NONE |
| | | 256K x | 256K x | | |
| | | 9 | 9 | | |
|------------+---------+---------+---------+--------+--------|
| 2MB | 4MB | (4) | (4) | (4) | (4) |
| | | 256K x | 256K x | 256K x | 256K x |
| | | 9 | 9 | 9 | 9 |
|------------+---------+---------+---------+--------+--------|
| 4MB | 4MB | (4) 1M | NONE | NONE | NONE |
| | | x 9 | | | |
|------------+---------+---------+---------+--------+--------|
| 8MB | 8MB | (4) 1M | (4) 1M | NONE | NONE |
| | | x 9 | x 9 | | |
|------------+---------+---------+---------+--------+--------|
| 8MB | 16MB | (4) 1M | (4) 1M | (4) 1M | (4) 1M |
| | | x 9 | x 9 | x 9 | x 9 |
|------------------------------------------------------------|
| Note: Banks 2 & 3 are located on the external memory card. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W1 | W15 | W21 | PAL |
|----------------+--------+--------+--------+----------------|
| 1MB | Closed | Closed | Closed | ICX-1816A-107C |
|----------------+--------+--------+--------+----------------|
| 2MB | Closed | Closed | Open | ICX-1816-107A |
|----------------+--------+--------+--------+----------------|
| 4MB (256K x 9) | Closed | Closed | Closed | ICX-1816A-107C |
|----------------+--------+--------+--------+----------------|
| 4MB (1M x 9) | Open | Open | Open | ICX-1816-107A |
|----------------+--------+--------+--------+----------------|
| 8MB | Open | Open | Open | ICX-1816-107A |
|----------------+--------+--------+--------+----------------|
| 16MB | Open | Open | Open | ICX-1816-107A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 64KB | (8) 16K x 4 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 128KB | (8) 16K x 4 | (8) 16K x | NONE | NONE |
| | | 4 | | |
|-------+-------------+------------+------------+------------|
| 256KB | (8) 16K x 4 | (8) 16K x | (8) 16K x | (8) 16K x |
| | | 4 | 4 | 4 |
|------------------------------------------------------------|
| Note: Banks 2 & 3 are located on the external memory card. |
+------------------------------------------------------------+
IMG IMG 2