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# WYSE TECHNOLOGY, INC.
WYSE DECISION 486SI
Processor 80486SX/80486DX/80486DX2
Processor 16/20/25/33/50(internal)/66(internal)MHz
Speed
Chip Set Unidentified
Max. Onboard 64MB
DRAM
Cache 64/256KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options PS/2 mouse port, parallel port, serial ports (2),
VGA port, floppy drive interface, IDE interface
NPU Options 4167
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | CN1 | Floppy drive | CN6 |
| | | interface | |
|-----------------+----------+--------------------+----------|
| VGA port | CN2 | IDE interface | CN7 |
|-----------------+----------+--------------------+----------|
| Parallel port | CN3 | External battery | J1 |
|-----------------+----------+--------------------+----------|
| Serial port 2 | CN4 | Front panel | J2 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Serial port 1 | CN5 | Riser Card | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | JP16 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP16 | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| | IDE interface enabled | JP18 | Open |
|---+----------------------------------+--------+------------|
| » | IDE interface disabled | JP18 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP19 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP20 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP21 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP22 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | IRQ2 enabled | JP33 | Open |
|---+----------------------------------+--------+------------|
| | IRQ2 disabled | JP33 | Closed |
|---+----------------------------------+--------+------------|
| » | ET4000 VGA card revision select | JP37 | Closed |
| | revision G | | |
|---+----------------------------------+--------+------------|
| | ET4000 VGA card revision select | JP37 | Open |
| | revision F | | |
|---+----------------------------------+--------+------------|
| » | Clock generator select normal | JP41 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Clock generator select | JP41 | pins 2 & 3 |
| | oscillator | | closed |
|---+----------------------------------+--------+------------|
| » | WY-790 enabled | JP42 | Closed |
|---+----------------------------------+--------+------------|
| | WY-790 disabled | JP42 | Open |
|---+----------------------------------+--------+------------|
| » | Diskette controller IRQ select | JP44 | pins 1 & 2 |
| | IRQ7 | | closed |
|---+----------------------------------+--------+------------|
| | Diskette controller IRQ select | JP44 | pins 2 & 3 |
| | IRQ5 | | closed |
|---+----------------------------------+--------+------------|
| » | Linear address enabled | JP46 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Linear address disabled | JP46 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 1M x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 7MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 13MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 4M x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 19MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 21MB | (1) 4M x 36 | (1) 1M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 22MB | (1) 4M x 36 | (1) 1M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 25MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | (1) 256K x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 33MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 37MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 49MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 52MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP4 | JP5 | JP7 |
|--------------+---------------+--------------+--------------|
| None | Open | Open | Open |
|--------------+---------------+--------------+--------------|
| 64KB | Open | Open | Open |
|--------------+---------------+--------------+--------------|
| 256KB | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP3 |
|------------+-------------------+--------+------------------|
| 80486SX | Open | Open | pins 1 & 2 |
| | | | closed |
|------------+-------------------+--------+------------------|
| 80486DX | pins 1 & 2 closed | Closed | pins 2 & 3 |
| | | | closed |
|------------+-------------------+--------+------------------|
| SL80486DX2 | pins 1 & 2 closed | Closed | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP38 | JP39 | JP40 |
|---------------+--------------+--------------+--------------|
| 16MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 20MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 66iMHz | Open | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (4) 256K x 4 | NONE |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 4 | (4) 256K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VGA CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP8 | JP35 | JP45 |
|----------+----------------+----------------+---------------|
| Enabled | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| Disabled | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VGA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP31 | JP32 |
|--------------------+-------------------+-------------------|
| 0 wait states | Closed | Open |
|--------------------+-------------------+-------------------|
| 1 wait state | Open | Closed |
+------------------------------------------------------------+