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# WYSE TECHNOLOGY, INC.
WYSE DECISION 486SE
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 16/20/25/33/50(Internal)/50/66(Internal)
Chip Set OPTI
Max. Onboard 128MB
DRAM
SRAM Cache 128/256/512KB
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit local bus slots (2), CPU processor slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Speaker | J1 | 32-bit local bus slot | SL1 |
|--------------+----------+-----------------------+----------|
| Power LED & | J2 | 32-bit local bus slot | SL2 |
| keylock | | | |
|--------------+----------+-----------------------+----------|
| Reset switch | S1 | CPU processor slot | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS SYSTEM BOARD |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP1 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP2 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP7 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP8 | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP8 | open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP12 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP13 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP14 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP15 | open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP16 | closed |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS CLOCK CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP9 | JP10 | JP11 |
|-----------------------+---------+------+-------------------|
| » | £ 25MHz | Open | Open | pins 2 & 3 closed |
|---+-------------------+---------+------+-------------------|
| | ³ 33MHz | Closed | Open | pins 1 & 2 closed |
|---+-------------------+---------+------+-------------------|
| » | 16MHz synchronous | Open | Open | pins 2 & 3 closed |
|---+-------------------+---------+------+-------------------|
| » | 20MHz synchronous | Open | Open | pins 2 & 3 closed |
|---+-------------------+---------+------+-------------------|
| | 25MHz synchronous | Closed | Open | pins 1 & 2 closed |
|---+-------------------+---------+------+-------------------|
| | 50MHz synchronous | Closed | Open | pins 1 & 2 closed |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS CPU BOARD |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+---------+-------------|
| » | Factory configured - do not | JP4 | open |
| | alter | | |
|-----+------------------------------+---------+-------------|
| » | Factory configured - do not | JP5 | closed |
| | alter | | |
|-----+------------------------------+---------+-------------|
| » | Clock generator/oscillator | JP14 | pins 1 & 2 |
| | enabled | | closed |
|-----+------------------------------+---------+-------------|
| | Clock generator/oscillator | JP14 | pins 2 & 3 |
| | disabled | | closed |
|------------------------------------------------------------|
| Note: Clock generator is installed in U34 on board X770171 |
| and in U33 on board Y77071. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
|Size | JP6 | JP8 | JP9 | JP10 | JP11 | JP12 | JP13 |
|-----+------------+------+------+------+------+------+------|
|128KB| pins 1 & 2 |closed| open | open |closed| open | open |
| | closed | | | | | | |
|-----+------------+------+------+------+------+------+------|
|256KB| pins 2 & 3 |closed|closed| open |closed|closed| open |
| | closed | | | | | | |
|-----+------------+------+------+------+------+------+------|
|512KB| pins 1 & 2 |closed|closed|closed|closed|closed|closed|
| | closed | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
|Size | Cache |Location |TAG/U26 |TAG/U27 |TAG/U16| Dirty |
| | | | | | | Bit/U25 |
|-----+-------+---------+--------+--------+-------+----------|
|64KB |(8) 8K |Banks 0 &| NONE | NONE |(1) 16K|(1) 64K x |
| | x 8 | 1 | | | x 1 | 1 |
|-----+-------+---------+--------+--------+-------+----------|
|128KB|(4) 32K| Bank 0 | NONE |(1) 8K x|(1) 16K|(1) 64K x |
| | x 8 | | | 8 | x 1 | 1 |
|-----+-------+---------+--------+--------+-------+----------|
|256KB|(8) 32K|Banks 0 &|(1) 8K x|(1) 8K x|(1) 16K|(1) 64K x |
| | x 8 | 1 | 8 | 8 | x 1 | 1 |
|-----+-------+---------+--------+--------+-------+----------|
|512KB| (8) | Bank 0 | NONE |(1) 32K |(1) 64K|(1) 64K x |
| |128K x | | | x 8 | x 1 | 1 |
| | 8 | | | | | |
|------------------------------------------------------------|
|Note: For Tag Ram U16 may be occupied with 64K x 1 chips. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Type | CPU | JP1 | JP2 | JP3 | JP7 |
| | Speed | | | | |
|--------------+---------+----------+-------+-------+--------|
| 80486SX | 16MHz | pins 2 & | pins | open | open |
| | | 3 | 2 & 3 | | |
|--------------+---------+----------+-------+-------+--------|
| 80487SX | 16MHz | closed | pins | pins | open |
| | | | 2 & 3 | 1 & 2 | |
|--------------+---------+----------+-------+-------+--------|
| 80486SX | 20MHz | pins 2 & | pins | open | open |
| | | 3 | 2 & 3 | | |
|--------------+---------+----------+-------+-------+--------|
| 80487SX | 20MHz | closed | pins | pins | open |
| | | | 2 & 3 | 1 & 2 | |
|--------------+---------+----------+-------+-------+--------|
| 80486SX | 25MHz | pins 2 & | pins | open | closed |
| | | 3 | 2 & 3 | | |
|--------------+---------+----------+-------+-------+--------|
| 80486SX | 33MHz | pins 2 & | pins | open | closed |
| | | 3 | 2 & 3 | | |
|--------------+---------+----------+-------+-------+--------|
| 80486DX | 25MHz | closed | pins | pins | closed |
| | | | 2 & 3 | 2 & 3 | |
|--------------+---------+----------+-------+-------+--------|
| 80486DX | 33MHz | closed | pins | pins | closed |
| | | | 2 & 3 | 2 & 3 | |
|--------------+---------+----------+-------+-------+--------|
| 80486DX2/50i | 25MHz | closed | pins | pins | closed |
| | | | 2 & 3 | 2 & 3 | |
|--------------+---------+----------+-------+-------+--------|
| 80486DX2/66i | 33MHz | closed | pins | pins | closed |
| | | | 2 & 3 | 2 & 3 | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+---------------------------------------------------------------+
| CPU TYPE CONFIGURATION SWITCH 1 BOARD X77017 |
|---------------------------------------------------------------|
| Type |SW1/1|SW1/2|SW1/3|SW1/4|SW1/5|SW1/6|SW1/7|SW1/8|
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/16MHz | off | on | off | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80487SX/16MHz | off | on | off | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/20MHz | off | off | off | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80487SX/20MHz | off | off | off | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/25MHz | off | on | on | off | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/33MHz | off | on | on | off | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486DX/25MHz | off | on | on | off | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486DX/33MHz | off | on | on | off | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
|80486DX2/50iMHz| off | on | on | off | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
|80486DX2/66iMHz| off | off | on | off | on | off | on | off |
+---------------------------------------------------------------+
+---------------------------------------------------------------+
| CPU TYPE CONFIGURATION SWITCH 1 BOARD Y77017 |
|---------------------------------------------------------------|
| Type |SW1/1|SW1/2|SW1/3|SW1/4|SW1/5|SW1/6|SW1/7|SW1/8|
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/16MHz | on | off | off | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80487SX/16MHz | on | off | off | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/20MHz | off | off | on | on | on | off | off | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80487SX/20MHz | off | off | on | on | on | off | off | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/25MHz | off | off | on | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486SX/33MHz | off | on | on | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486DX/25MHz | on | off | on | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
| 80486DX/33MHz | off | on | on | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
|80486DX2/50iMHz| on | on | on | on | on | off | on | off |
|---------------+-----+-----+-----+-----+-----+-----+-----+-----|
|80486DX2/66iMHz| off | off | on | on | on | off | on | off |
+---------------------------------------------------------------+