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# TYAN COMPUTER CORPORATION
486 BABY EISA (REV. 2.0)
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33/40/50MHz
Chip Set OPTI
Max. Onboard DRAM 128MB
Cache 64/128/256/512KB
BIOS AMI/Phoenix
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | J4 | Turbo LED | J7 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J5 | Reset switch | S9 |
|---------------------+----------+----------------+----------|
| Turbo switch | J6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Snooping/flush select 20MHz | JP8 | Closed |
|---+----------------------------------+--------+------------|
| | Snooping/flush select | JP8 | Open |
| | 25/33/40/50MHz | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP9 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP9 | Open |
|---+----------------------------------+--------+------------|
| » | CPU speed select iOSC/1 | JP12 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed select iOCS/2 | JP12 | 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 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | NONE |
|------------------+--------------------+--------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (4) 128K x 8 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TAG CONFIGURATION |
|------------------------------------------------------------|
| Size | TAG (U54) | TAG (U55) | TAG (U56) | TAG (U72) |
|-------+-------------+------------+------------+------------|
| 64KB | (1) 64K x 1 | (1) 8K x 8 | NONE | (1) 64K x |
| | | | | 1 |
|-------+-------------+------------+------------+------------|
| 128KB | (1) 64K x 1 | (1) 8K x 8 | NONE | (1) 64K x |
| | | | | 1 |
|-------+-------------+------------+------------+------------|
| 256KB | (1) 64K x 1 | (1) 8K x 8 | (1) 8K x 8 | (1) 64K x |
| | | | | 1 |
|-------+-------------+------------+------------+------------|
| 512KB | (1) 64K x 1 | (1) 32K x | NONE | (1) 64K x |
| | | 8 | | 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP2 | JP3 | JP4 | JP5 | JP16 | JP17 | JP18 |
|-------+-------+-------+-------+-------+------+------+------|
| 64KB | 2 & 3 | Open | Open | Open | Open | Open | Open |
|-------+-------+-------+-------+-------+------+------+------|
| 128KB | 1 & 2 |Closed |Closed | Open |Closed| Open | Open |
|-------+-------+-------+-------+-------+------+------+------|
| 256KB | 2 & 3 |Closed |Closed | Open |Closed| Open |Closed|
|-------+-------+-------+-------+-------+------+------+------|
| 512KB | 1 & 2 |Closed |Closed |Closed |Closed|Closed|Closed|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP10 | JP11 |
|---------+------------+------------------------+------------|
| 80486SX | pins 2 & 3 | pins 2 & 3 closed | Open |
| | closed | | |
|---------+------------+------------------------+------------|
| 80487SX | pins 2 & 3 | pins 1 & 2, 3 & 4 | pins 1 & 2 |
| | closed | closed | closed |
|---------+------------+------------------------+------------|
| 80486DX | pins 1 & 2 | pins 1 & 2, 3 & 4 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP6 | JP7 |
|-------------------+--------------------+-------------------|
| 20MHz | Open | Open |
|-------------------+--------------------+-------------------|
| 25MHz | Open | Open |
|-------------------+--------------------+-------------------|
| 33MHz | Open | Closed |
|-------------------+--------------------+-------------------|
| 40MHz | Closed | Open |
|-------------------+--------------------+-------------------|
| 50MHz | Closed | Closed |
+------------------------------------------------------------+