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# CSS LABORATORIES, INC.
PREFERRED 486 GA/VL ESP
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/50(internal)50/66(internal)/66MHz
Speed
Chip Set OPTI
Max. Onboard 32/64MB
DRAM
Cache 64/256/512KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Front panel | J39 | Power LED & | JP55 |
| connector | | keylock | |
|-------------------+----------+------------------+----------|
| IDE interface LED | J40 | Turbo switch | JP101 |
|-------------------+----------+------------------+----------|
| Turbo LED/reset | J41 | Video to green | P1 |
| switch | | connector | |
|-------------------+----------+------------------+----------|
| Speaker | JP1 | 32-bit VESA | SL1 & |
| | | Local bus slots | SL2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Green PC password enabled | J57 | Open |
|---+---------------------------+---------------+------------|
| | Green PC password | J57 | Closed |
| | disabled | | |
|---+---------------------------+---------------+------------|
| » | VESA bus clock select CPU | JP7 | Closed |
| | speed & 1 clock | | |
|---+---------------------------+---------------+------------|
| | VESA bus clock select CPU | JP7 | Open |
| | speed | | |
|---+---------------------------+---------------+------------|
| » | Cache burst mode select | JP9 | Open |
| | 2-1-1-1 | | |
|---+---------------------------+---------------+------------|
| | Cache burst mode select | JP9 | Closed |
| | 3-2-2-2 | | |
|---+---------------------------+---------------+------------|
| » | CPU type select | JP11 | Pins 2 & 3 |
| | DX/DX2/Overdrive | | closed |
|---+---------------------------+---------------+------------|
| | CPU type select Overdrive | JP11 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | CPU type select non SX | JP14 | Open |
| | CPU | | |
|---+---------------------------+---------------+------------|
| | CPU type select SX CPU | JP14 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Video card address select | JP47 | Open |
| | C000h-C7FFh disabled | | |
|---+---------------------------+---------------+------------|
| | Video card address select | JP47 | Closed |
| | C000h-C7FFh enabled | | |
|---+---------------------------+---------------+------------|
| » | Flash BIOS enabled | JP52 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Flash BIOS disabled | JP52 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Monitor type select color | JP56 | Closed |
|---+---------------------------+---------------+------------|
| | Monitor type select | JP56 | Open |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| » | Keyboard synchronous with | JP70 | Pins 2 & 3 |
| | CPU | | closed |
|---+---------------------------+---------------+------------|
| | Engineer test setting | JP70 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/7 | Off |
| | not alter. | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/8 | Off |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (30PIN) |
|------------------------------------------------------------|
| 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 |
|------------------------------------------------------------|
| Note: This board was manufactured with either 8 banks of |
| 30 pin SIMM sockets or 4 banks of 72 pin SIMM sockets. |
| Mainboard drawing depicts 72 pin SIMM sockets. If |
| mainboard has 30 pin SIMM sockets, use the above table. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (72 PIN) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+---------------+-----------+-----------+-----------|
| 2MB | (1) 512K x 36 | NONE | NONE | NONE |
|--------+---------------+-----------+-----------+-----------|
| 4MB | (1) 512K x 36 | (1) 512K | NONE | NONE |
| | | x 36 | | |
|--------+---------------+-----------+-----------+-----------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|--------+---------------+-----------+-----------+-----------|
| 6MB | (1) 512K x 36 | (1) 1M x | NONE | NONE |
| | | 36 | | |
|--------+---------------+-----------+-----------+-----------|
| 8MB | (1) 1M x 36 | (1) 1M x | NONE | NONE |
| | | 36 | | |
|--------+---------------+-----------+-----------+-----------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|--------+---------------+-----------+-----------+-----------|
| 10MB | (1) 512K x 36 | (1) 2M x | NONE | NONE |
| | | 36 | | |
|--------+---------------+-----------+-----------+-----------|
| 12MB | (1) 1M x 36 | (1) 2M x | NONE | NONE |
| | | 36 | | |
|--------+---------------+-----------+-----------+-----------|
| 12MB | (1) 512K x 36 | (1) 512K | (1) 2M x | NONE |
| | | x 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 14MB | (1) 512K x 36 | (1) 1M x | (1) 2M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 16MB | (1) 2M x 36 | (1) 2M x | NONE | NONE |
| | | 36 | | |
|--------+---------------+-----------+-----------+-----------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|--------+---------------+-----------+-----------+-----------|
| 16MB | (1) 1M x 36 | (1) 1M x | (1) 2M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 18MB | (1) 512K x 36 | (1) 2M x | (1) 2M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 20MB | (1) 512K x 36 | (1) 512K | (1) 2M x | (1) 2M x |
| | | x 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 20MB | (1) 1M x 36 | (1) 2M x | (1) 2M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 22MB | (1) 512K x 36 | (1) 1M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 24MB | (1) 1M x 36 | (1) 1M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 24MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 24MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 26MB | (1) 512K x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 28MB | (1) 1M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 32MB | (1) 4M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|--------+---------------+-----------+-----------+-----------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
|--------+---------------+-----------+-----------+-----------|
| 32MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 32MB | (1) 2M x 36 | (1) 2M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 48MB | (1) 2M x 36 | (1) 2M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|--------+---------------+-----------+-----------+-----------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|--------+---------------+-----------+-----------+-----------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|------------------------------------------------------------|
| Note: This board was manufactured with either 8 banks of |
| 30 pin SIMM sockets or 4 banks of 72 pin SIMM sockets. |
| Mainboard drawing depicts 72 pin SIMM sockets. If |
| mainboard has 72 pin SIMM sockets, use the above table. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size |JP20 |JP21 |JP27 |JP28 |JP29 |JP35 |JP36 |JP38 |JP40 |
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
| 64KB |1 & 2|1 & 2|1 & 2|1 & 2|2 & 3|2 & 3|2 & 3|1 & 2|2 & 3|
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
|256KB |1 & 2|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|1 & 2|2 & 3|
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
|512KB |2 & 3|2 & 3|2 & 3|2 & 3|1 & 2|1 & 2|1 & 2|2 & 3|1 & 2|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP15 | JP16 | JP17 |
|--------------+------------+-------------------+------------|
| 80486SX | Open | Pins 2 & 3 closed | Open |
|--------------+------------+-------------------+------------|
| 80486DX | Closed | Pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| OVERDRIVE/80486SX CONFIGURATION |
|------------------------------------------------------------|
| Type | JP12 |
|---------------------------------+--------------------------|
| » | Both sockets enabled | Open |
|---+-----------------------------+--------------------------|
| | 80486SX disabled | Pins 1 & 2 closed |
|---+-----------------------------+--------------------------|
| | Overdrive disabled | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP8 | JP19 | JP50 |
|-------------+-------------+-------------------+------------|
| 25MHz | Closed | Pins 1 & 2 closed | N/A |
|-------------+-------------+-------------------+------------|
| 33MHz | Closed | Pins 1 & 2 closed | N/A |
|-------------+-------------+-------------------+------------|
| 50iMHz | Open | Pins 2 & 3 closed | N/A |
|-------------+-------------+-------------------+------------|
| 50MHz | N/A | N/A | Closed |
|-------------+-------------+-------------------+------------|
| 66iMHz | Open | Pins 2 & 3 closed | N/A |
|-------------+-------------+-------------------+------------|
| 66MHz | N/A | N/A | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA SYSTEM SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP4 |
|-------------------------------+----------------------------|
| < 33MHz | Open |
|-------------------------------+----------------------------|
| >= 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE |
|------------------------------------------------------------|
| Setting | JP5 | JP6 | JP10 |
|---------------+--------------+--------------+--------------|
| 0 wait states | Open | Open | Open |
|---------------+--------------+--------------+--------------|
| 1 wait state | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| GREEN PC IRQ DETECTION |
|------------------------------------------------------------|
| IRQ | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
|--------+--------+--------+--------+--------+-------+-------|
| IRQ3 | Off | Off | On | Off | Off | Off |
|--------+--------+--------+--------+--------+-------+-------|
| IRQ4 | Off | Off | Off | Off | On | Off |
|--------+--------+--------+--------+--------+-------+-------|
| IRQ6 | Off | Off | Off | Off | Off | On |
|--------+--------+--------+--------+--------+-------+-------|
| IRQ10 | On | Off | Off | Off | Off | Off |
|--------+--------+--------+--------+--------+-------+-------|
| IRQ11 | Off | On | Off | Off | Off | Off |
|--------+--------+--------+--------+--------+-------+-------|
| IRQ14 | Off | Off | Off | On | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| IRQ CONFIGURATION |
|------------------------------------------------------------|
| IRQ | SJ1 | SJ2 |
|--------------------+-------------------+-------------------|
| » | IRQ5 & IRQ7 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|---+----------------+-------------------+-------------------|
| | IRQ12 & IRQ15 | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED READY SIGNAL CONFIGURATION |
|------------------------------------------------------------|
| CPU Speed | JP3 | JP45 |
|--------------------+--------------------+------------------|
| > 33mhz (RDY1) | Pins 2 & 3 closed | Closed |
|--------------------+--------------------+------------------|
| < 25mhz (RDY2) | Pins 1 & 2 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FRONT PANEL PIN OUT CONFIGURATION |
|------------------------------------------------------------|
| Pin | Assignment |
|----------------------------+-------------------------------|
| 1 | Ground |
|----------------------------+-------------------------------|
| 2 | Power LED |
|----------------------------+-------------------------------|
| 3 | Hard drive LED |
|----------------------------+-------------------------------|
| 4 | Not used |
|----------------------------+-------------------------------|
| 5 | Power |
|----------------------------+-------------------------------|
| 6 | Ground |
|----------------------------+-------------------------------|
| 7 | Turbo LED |
|----------------------------+-------------------------------|
| 8 | Keyboard inhibit |
|----------------------------+-------------------------------|
| 9 | Power |
|----------------------------+-------------------------------|
| 10 | Reset switch |
+------------------------------------------------------------+