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# BEC COMPUTER ENTERPRISE
80486AT (Ver. 1.0)
Processor 80486DX
Processor Speed 25/33MHz
Chip Set None
Max. Onboard DRAM 16MB
SRAM Cache 64/256KB
BIOS AMI
Dimensions 355mm x 304mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Reset switch | W1 | Power LED & keylock | W5 |
|----------------+----------+---------------------+----------|
| Turbo switch | W3 | Speaker | W10 |
|----------------+----------+---------------------+----------|
| Turbo LED | W4 | External battery | W11 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (4) 256K x | (4) 256K x | (4) 256K x | NONE |
| | 9 | 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 |
|------+-------------+-------------+------------+------------|
| 5MB | (4) 256K x | (4) 1M x 9 | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 6MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 7MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 1M x 9 |
| | 9 | 9 | 9 | |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 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 |
|------+-------------+-------------+------------+------------|
| 13MB | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SWITCH (SW2) CONFIGURATION |
|------------------------------------------------------------|
| Size | SW2/switch 1 | SW2/switch | SW2/switch | SW2/switch |
| | | 2 | 3 | 4 |
|------+--------------+------------+------------+------------|
| 1MB | open | open | open | open |
|------+--------------+------------+------------+------------|
| 2MB | closed | open | open | open |
|------+--------------+------------+------------+------------|
| 3MB | open | closed | open | open |
|------+--------------+------------+------------+------------|
| 4MB | closed | closed | open | open |
|------+--------------+------------+------------+------------|
| 4MB | open | open | closed | open |
|------+--------------+------------+------------+------------|
| 5MB | open | open | closed | closed |
|------+--------------+------------+------------+------------|
| 6MB | open | closed | open | closed |
|------+--------------+------------+------------+------------|
| 7MB | closed | open | open | closed |
|------+--------------+------------+------------+------------|
| 8MB | closed | open | closed | open |
|------+--------------+------------+------------+------------|
| 9MB | open | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 10MB | closed | closed | open | closed |
|------+--------------+------------+------------+------------|
| 12MB | open | closed | closed | open |
|------+--------------+------------+------------+------------|
| 13MB | closed | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 16MB | closed | closed | closed | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | Jumper W6 | Jumper W8 | Jumper W9 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (2) 16K x 4 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (2) 16K x 4 |
+------------------------------------------------------------+