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# NOVACOR, INC.
OPTimum EISA486SD - 6A5B1
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33/40/50MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256/512KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | J4 | Reset switch | S9 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| ยป | Monitor type select color | JP4 | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP4 | open |
|---+--------------------------------+--------+--------------|
| | CPU speed select iOCS/1 | JP8 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CPU speed select iOCS/2 | JP8 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP7 | JP9 |
|----------+-----------------------------+-------------------|
| 80486DX | pins 1 & 2 and 3 & 4 closed | pins 2 & 3 closed |
|----------+-----------------------------+-------------------|
| 80487SX | pins 1 & 2 and 3 & 4 closed | pins 1 & 2 closed |
|----------+-----------------------------+-------------------|
| 80486SX | pins 2 & 3 closed | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP1 | JP2 | JP3 | JP6 |
|---------+----------+---------+-------------------+---------|
| 50MHz | closed | closed | pins 1 & 2 closed | open |
|---------+----------+---------+-------------------+---------|
| 40MHz | open | closed | pins 1 & 2 closed | open |
|---------+----------+---------+-------------------+---------|
| 33MHz | closed | open | pins 1 & 2 closed | open |
|---------+----------+---------+-------------------+---------|
| 25MHz | open | open | pins 1 & 2 closed | open |
|---------+----------+---------+-------------------+---------|
| 20MHz | open | open | pins 2 & 3 closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
|Size | JP5 | JP10 | JP11 | JP12 | JP13 | JP14 | JP15 |
|-----+------------+------+------+------+------+------+------|
|64KB | pins 2 & 3 | open | open | open | open | open | open |
| | closed | | | | | | |
|-----+------------+------+------+------+------+------+------|
|128KB| pins 1 & 2 | open | open |closed| open |closed| open |
| | closed | | | | | | |
|-----+------------+------+------+------+------+------+------|
|256KB| pins 2 & 3 | open |closed|closed|closed|closed| open |
| | closed | | | | | | |
|-----+------------+------+------+------+------+------+------|
|512KB| pins 1 & 2 |closed|closed|closed|closed|closed|closed|
| | closed | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG | TAG | Dirty bit |
| | SRAM | | (U50) | (U51) | (U64) |
|--------+---------+----------+---------+--------+-----------|
| 64KB | (8) 8K | Banks 0 | (1) 8K | N/A | (1) 16K x |
| | x 8 | & 1 | x 8 | | 1 |
|--------+---------+----------+---------+--------+-----------|
| 128KB | (4) 32K | Bank 0 | (1) 8K | N/A | (1) 16K x |
| | x 8 | | x 8 | | 1 |
|--------+---------+----------+---------+--------+-----------|
| 256KB | (8) 32K | Banks 0 | (1) 8K | (1) 8K | (1) 16K x |
| | x 8 | & 1 | x 8 | x 8 | 1 |
|--------+---------+----------+---------+--------+-----------|
| 512KB | (4) | Bank 0 | (1) 32K | N/A | (1) 64K x |
| | 128K x | | x 8 | | 1 |
| | 8 | | | | |
|------------------------------------------------------------|
| Note:Dirty bit (U64) can always accommodate (1) 64K x 1 |
| for any of the four configurations. |
+------------------------------------------------------------+