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# TYAN COMPUTER CORPORATION
S1437
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33/50MHz
Chip Set OPTI
Max. Onboard DRAM 256MB
Cache 64/128/256/512KB
BIOS AMI/Phoenix
Dimensions 309mm x 331mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | J4 | Turbo LED | J6 |
|---------------------+----------+----------------+----------|
| Power LED & Keylock | J5 | Reset switch | S9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------+--------------+------------|
| » | External BCLK buffering | JP1 | pins 1 & 2 |
| | 486DX (33/50MHz) | | closed |
|---+----------------------------+--------------+------------|
| | External BCLK buffering | JP1 | pins 2 & 3 |
| | 486SX (20/25MHz) / 487SX | | closed |
|---+----------------------------+--------------+------------|
| » | Snooping/Flush 20MHz CPU | JP8 | closed |
|---+----------------------------+--------------+------------|
| | Snooping/Flush 25/33/40/50 | JP8 | open |
| | MHz CPU | | |
|---+----------------------------+--------------+------------|
| » | Monitor type select | JP9 | open |
| | monochrome | | |
|---+----------------------------+--------------+------------|
| | Monitor type select color | JP9 | closed |
|---+----------------------------+--------------+------------|
| » | CPU speed select OSC/1 | JP12 | pins 1 & 2 |
| | | | closed |
|---+----------------------------+--------------+------------|
| | CPU speed select OSC/2 | JP12 | pins 2 & 3 |
| | | | closed |
|---+----------------------------+--------------+------------|
| » | RTC/CMOS type select | JP13, JP14 & | pins 1 & 2 |
| | DS1287/1287A | JP15 | closed |
|---+----------------------------+--------------+------------|
| | RTC/CMOS type select | JP13, JP14 & | pins 2 & 3 |
| | DS1387/1488 | JP15 | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 4M x 9 | (4) 1M 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 |
|------------------+--------------------+--------------------|
| 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 | U54 | U55 | U56 | U71 | U72 (Dirty bit) |
|-------+-------+--------+--------+-------+------------------|
| 64KB | (1) | (1) 8K | NONE | (1) | (1) 16K x 1 or |
| | 64K x | x 1 | | 64K x | (1) 64K x 1 |
| | 1 | | | 1 | |
|-------+-------+--------+--------+-------+------------------|
| 128KB | (1) | (1) 8K | NONE | (1) | (1) 16K x 1 or |
| | 64K x | x 1 | | 64K x | (1) 64K x 1 |
| | 1 | | | 1 | |
|-------+-------+--------+--------+-------+------------------|
| 256KB | (1) | (1) 8K | (1) 8K | (1) | (1) 16K x 1 or |
| | 64K x | x 1 | x 1 | 64K x | (1) 64K x 1 |
| | 1 | | | 1 | |
|-------+-------+--------+--------+-------+------------------|
| 512KB | (1) | (1) | NONE | (1) | (1) 64K x 1 |
| | 64K x | 32K x | | 64K x | |
| | 1 | 1 | | 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 | Open | 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 | J10 | J11 |
|----------+-----------------------------+-------------------|
| 80486SX | pins 2 & 3 closed | open |
|----------+-----------------------------+-------------------|
| 80487SX | pins 1 & 2 and 3 & 4 closed | pins 1 & 2 closed |
|----------+-----------------------------+-------------------|
| 80486DX | pins 1 & 2 and 3 & 4 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EBC SPEED CONFIGURATION |
|------------------------------------------------------------|
| Size | JP6 | JP7 |
|-------------------+--------------------+-------------------|
| 20MHz | Open | Open |
|-------------------+--------------------+-------------------|
| 25MHz | Open | Open |
|-------------------+--------------------+-------------------|
| 33MHz | Open | Closed |
|-------------------+--------------------+-------------------|
| 40MHz | Closed | Open |
|-------------------+--------------------+-------------------|
| 50MHz | Closed | Closed |
+------------------------------------------------------------+