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# TYAN COMPUTER CORPORATION
486VL EISA VESA LOCAL BUS (REV. 1.0)
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50 (Internal)/50/66 (Internal)MHz
Chip Set SIS
Max. Onboard DRAM 256MB
Cache 64/128/256/512/1024KB
BIOS AMI
Dimensions 330mm x 220mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Power LED & | JP20 | Turbo switch | JP23 |
| keylock | | | |
|--------------+----------+-----------------------+----------|
| Speaker | JP21 | Turbo LED | JP24 |
|--------------+----------+-----------------------+----------|
| Reset switch | JP22 | 32-bit VESA Local bus | S1 & S2 |
| | | slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|---------------------------------+---------------+----------|
| » | Factory configured - do not | JP18 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|-------+-------------+------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 28MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 |
|-------+-------------+------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|-------+-------------+------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 52MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|-------+-------------+------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|-------+-------------+------------+------------+------------|
| 64MB | (4) 16M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 128MB | (4) 16M x 9 | (4) 16M x | NONE | NONE |
| | | 9 | | |
|-------+-------------+------------+------------+------------|
| 192MB | (4) 16M x 9 | (4) 16M x | (4) 16M x | NONE |
| | | 9 | 9 | |
|-------+-------------+------------+------------+------------|
| 256MB | (4) 16M x 9 | (4) 16M x | (4) 16M x | (4) 16M x |
| | | 9 | 9 | 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG (U15) | TAG (U16) |
|--------+-------------+------------+------------+-----------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
|--------+-------------+------------+------------+-----------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 | NONE |
|--------+-------------+------------+------------+-----------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 8K x 8 | NONE |
| | | 8 | | |
|--------+-------------+------------+------------+-----------|
| 512KB | (8) 32K x 8 | (8) 32K x | (1) 32K x | NONE |
| | | 8 | 8 | |
|--------+-------------+------------+------------+-----------|
| 1024KB | (8) 128K x | NONE | (1) 32K x | (1) 32K x |
| | 8 | | 8 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP7 |JP8 |JP9 |JP10 |JP12 |JP13 |JP14|
|------+------+------+------+----+----+-----+-----+-----+----|
| 64KB | Open | Open | Open |2 & |1 & |1 & 2|Open |2 & 3|1 & |
| | | | | 3 | 2 | | | | 2 |
|------+------+------+------+----+----+-----+-----+-----+----|
|128KB |Closed| Open | Open |2 & |1 & |1 & 2|Open |1 & 2|1 & |
| | | | | 3 | 2 | | | | 2 |
|------+------+------+------+----+----+-----+-----+-----+----|
|256KB |Closed|Closed| Open |2 & |2 & |1 & 2|Open |2 & 3|2 & |
| | | | | 3 | 3 | | | | 3 |
|------+------+------+------+----+----+-----+-----+-----+----|
|512KB |Closed|Closed|Closed|2 & |1 & |1 & 2|1 & 2|1 & 2|1 & |
| | | | | 3 | 2 | | | | 2 |
|------+------+------+------+----+----+-----+-----+-----+----|
|1024KB|Closed|Closed|Closed|1 & |1 & |2 & 3|2 & 3|2 & 3|2 & |
| | | | | 2 | 2 | | | | 3 |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 |
|------------+--------------------+--------------------------|
| 80486SX | Pins 1 & 2 closed | pins 2 & 3 closed |
|------------+--------------------+--------------------------|
| 80487SX | Pins 1 & 2 closed | pins 2 & 3 closed |
|------------+--------------------+--------------------------|
| 80486DX | Pins 2 & 3 closed | pins 1 & 2, 3 & 4 closed |
|------------+--------------------+--------------------------|
| 80486DX2 | Pins 2 & 3 closed | pins 1 & 2, 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP16 |
|----------------------------+-------------------------------|
| £ 33MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 1 & 2 closed |
+------------------------------------------------------------+