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# AMERICAN DIGICOM CORPORATION
486E CACHE MAINBOARD
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set OPTI
Max. onboard DRAM 128MB
SRAM Cache 64/128/256/512KB
BIOS AMI
Dimensions 330.2mm x 215.8mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | J4 | Turbo LED | JP17 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J5 | Reset switch | S9 |
|---------------------+----------+----------------+----------|
| Turbo switch | JP16 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | I/O bus mode select EISA | JP0 | Open |
|---+------------------------------------+--------+----------|
| | I/O bus mode select ISA | JP0 | Closed |
|---+------------------------------------+--------+----------|
| » | Monitor type select color | JP4 | Closed |
|---+------------------------------------+--------+----------|
| | Monitor type select monochrome | JP4 | Open |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP6 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 80486SX | 80487SX | 80486DX/DX2 |
|--------+------------+-------------------+------------------|
| JP7 | pins 2 & 3 | pins 1 & 2 and 3 | pins 1 & 2 and 3 |
| | closed | & 4 closed | & 4 closed |
|--------+------------+-------------------+------------------|
| JP9 | Open | pins 1 & 2 closed | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | iOSC | JP1 | JP2 | JP3 | JP8 |
|---------+-------+--------+--------+------------+-----------|
| 20MHz | 40MHz | Open | Closed | pins 2 & 3 | pins 2 & |
| | | | | | 3 |
|---------+-------+--------+--------+------------+-----------|
| 25MHz | 50MHz | Open | Open | pins 1 & 2 | pins 2 & |
| | | | | | 3 |
|---------+-------+--------+--------+------------+-----------|
| 33MHz | 66MHz | Closed | Open | pins 1 & 2 | pins 2 & |
| | | | | | 3 |
|---------+-------+--------+--------+------------+-----------|
| 40MHz | 80MHz | Open | Closed | pins 1 & 2 | pins 2 & |
| | | | | | 3 |
|---------+-------+--------+--------+------------+-----------|
| 50i MHz | 50MHz | Open | Open | pins 1 & 2 | pins 2 & |
| | | | | | 3 |
|---------+-------+--------+--------+------------+-----------|
| 50MHz | 50MHz | Closed | Closed | pins 1 & 2 | pins 1 & |
| | | | | | 2 |
|---------+-------+--------+--------+------------+-----------|
| 66i MHz | 66MHz | Closed | Open | pins 1 & 2 | pins 2 & |
| | | | | | 3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-----------+------------------------+-----------------------|
| 4MB | (4) 1M x 9 | NONE |
|-----------+------------------------+-----------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|-----------+------------------------+-----------------------|
| 16MB | (4) 4M x 9 | NONE |
|-----------+------------------------+-----------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 64MB | (4) 16M x 9 | NONE |
|-----------+------------------------+-----------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | U49 | U50 | U51 | U64 |
|-------+---------+---------+-------+-------+--------+-------|
| 64KB | (4) 8K | (4) 8K | (1) | (1) | NONE | (1) |
| | x 8 | x 8 | 64K x | 8K x | | 16K x |
| | | | 1 | 8 | | 1 |
|-------+---------+---------+-------+-------+--------+-------|
| 128KB | (4) 32K | NONE | (1) | (1) | NONE | (1) |
| | x 8 | | 64K x | 8K x | | 16K x |
| | | | 1 | 8 | | 1 |
|-------+---------+---------+-------+-------+--------+-------|
| 256KB | (4) 32K | (4) 32K | (1) | (1) | (1) 8K | (1) |
| | x 8 | x 8 | 64K x | 8K x | x 8 | 16K x |
| | | | 1 | 8 | | 1 |
|-------+---------+---------+-------+-------+--------+-------|
| 512KB | (4) | NONE | (1) | (1) | NONE | (1) |
| | 128K x | | 64K x | 32K x | | 64K x |
| | 8 | | 1 | 8 | | 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 64KB | 128KB | 256KB | 512KB |
|--------+------------+------------+------------+------------|
| JP5 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| JP10 | Open | Open | Open | Closed |
|--------+------------+------------+------------+------------|
| JP11 | Open | Open | Closed | Closed |
|--------+------------+------------+------------+------------|
| JP12 | Open | Closed | Closed | Closed |
|--------+------------+------------+------------+------------|
| JP13 | Open | Open | Closed | Closed |
|--------+------------+------------+------------+------------|
| JP14 | Open | Closed | Closed | Closed |
|--------+------------+------------+------------+------------|
| JP15 | Open | Open | Open | Closed |
+------------------------------------------------------------+