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# BCM ADVANCED RESEARCH, INC.
SILVER II AS500LP
Processor 80486SX/80487SX/80486DX/80486DX2/ODP586SX
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. onboard 64MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA riser card slot, floppy drive
interface, ISA riser card slot, parallel port,
PS/2 mouse port, PS/2 keyboard port, serial
ports (2), VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| VGA port | C1 | Power LED & keylock | J1 |
|---------------+----------+----------------------+----------|
| Parallel port | C2 | Turbo LED | J3 |
|---------------+----------+----------------------+----------|
| Serial port | C3 | Turbo switch | J4 |
|---------------+----------+----------------------+----------|
| Serial port | C4 | Reset switch | J5 |
|---------------+----------+----------------------+----------|
| PS/2 mouse | C5 | Speaker | J9 |
|---------------+----------+----------------------+----------|
| PS/2 keyboard | C6 | ISA riser card slot | S1 |
|---------------+----------+----------------------+----------|
| IDE interface | C7 | 32-bit VESA riser | S2 |
| | | card slot | |
|---------------+----------+----------------------+----------|
| Floppy drive | C8 | | |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | JP6 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP6 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP7 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP7 | Closed |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP8 | pins 1 & 2 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP8 | pins 2 & 3 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP14 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP15 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | PQFP 80486SX disabled | JP102 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | PQFP 80486SX enabled | JP102 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | PS/2 mouse port enabled | JP103 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | PS/2 mouse port disabled | JP103 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | IDE interface enabled | S1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | IDE interface disabled | S1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | S2 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | S3 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | S4 | pins 2 & 3 |
| | alter | | closed |
+------------------------------------------------------------+
+--------------------------------------------------------------+
| I/O JUMPER CONFIGURATION |
|--------------------------------------------------------------|
|Floppy(C8)| C3 | C4 | C2 |JP20|JP19|JP18|JP17|JP16|
|----------+--------+--------+--------+----+----+----+----+----|
| Enabled | COM1 | COM2 | LPT2 |1 & |2 & |2 & |1 & |1 & |
| | | | | 2 | 3 | 3 | 2 | 2 |
|----------+--------+--------+--------+----+----+----+----+----|
| Enabled | COM1 | COM2 | LPT1 |1 & |2 & |2 & |1 & |2 & |
| | | | | 2 | 3 | 3 | 2 | 3 |
|----------+--------+--------+--------+----+----+----+----+----|
| Enabled | COM3 | COM4 | LPT1 |1 & |2 & |2 & |2 & |1 & |
| | | | | 2 | 3 | 3 | 3 | 2 |
|----------+--------+--------+--------+----+----+----+----+----|
| Enabled | COM2 | COM3 | LPT2 |1 & |2 & |2 & |2 & |2 & |
| | | | | 2 | 3 | 3 | 3 | 3 |
|----------+--------+--------+--------+----+----+----+----+----|
| Disabled | COM1 | COM2 | LPT2 |2 & |1 & |2 & |1 & |1 & |
| | | | | 3 | 2 | 3 | 2 | 2 |
|----------+--------+--------+--------+----+----+----+----+----|
| Disabled | COM1 | COM2 | LPT1 |2 & |1 & |2 & |1 & |2 & |
| | | | | 3 | 2 | 3 | 2 | 3 |
|----------+--------+--------+--------+----+----+----+----+----|
| Disabled | COM3 | COM4 | LPT1 |2 & |1 & |2 & |2 & |1 & |
| | | | | 3 | 2 | 3 | 3 | 2 |
|----------+--------+--------+--------+----+----+----+----+----|
| Disabled | COM2 | COM3 | LPT2 |2 & |1 & |2 & |2 & |2 & |
| | | | | 3 | 2 | 3 | 3 | 3 |
|----------+--------+--------+--------+----+----+----+----+----|
| Enabled |Disabled|Disabled|Disabled|2 & |2 & |2 & |2 & |1 & |
| | | | | 3 | 3 | 3 | 3 | 2 |
|----------+--------+--------+--------+----+----+----+----+----|
| Disabled |Disabled|Disabled|Disabled|2 & |2 & |2 & |2 & |2 & |
| | | | | 3 | 3 | 3 | 3 | 3 |
|--------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+--------------------------------------------------------------+
+------------------------------------------------------------+
| ONBOARD VGA JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Onboard VGA | T2JP1 | T2JP2 | T2JP3 |
| port | | | |
|---------------+--------------+--------------+--------------|
| Enabled | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| Disabled | pins 3 & 4 | pins 3 & 4 | pins 3 & 4 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VGA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait State | JP12 | JP13 |
|------------------+--------------------+--------------------|
| 0 (25MHz) | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 1 (33MHz) | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 2 (40MHz) | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 3 (50MHz) | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank3 | JP100 | JP101 |
|------+--------+--------+--------+-------+---------+--------|
| 1MB | 256K x | NONE | NONE | NONE | Open | Open |
| | 36 | | | | | |
|------+--------+--------+--------+-------+---------+--------|
| 2MB | 256K x | 256K x | NONE | NONE | Open | Open |
| | 36 | 36 | | | | |
|------+--------+--------+--------+-------+---------+--------|
| 2MB | 512K x | NONE | NONE | NONE | pins 1 | Open |
| | 36 | | | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 4MB | 1M x | NONE | NONE | NONE | Open | Open |
| | 36 | | | | | |
|------+--------+--------+--------+-------+---------+--------|
| 6MB | 256K x | 256K x | 1M x | NONE | Open | Open |
| | 36 | 36 | 36 | | | |
|------+--------+--------+--------+-------+---------+--------|
| 6MB | 512K x | NONE | 1M x | NONE | pins 1 | Open |
| | 36 | | 36 | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 8MB | 1M x | 1M x | NONE | NONE | Open | Open |
| | 36 | 36 | | | | |
|------+--------+--------+--------+-------+---------+--------|
| 8MB | 2M x | NONE | NONE | NONE | pins 1 | Open |
| | 36 | | | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 10MB | 256K x | 256K x | 1M x | 1M x | Open | Open |
| | 36 | 36 | 36 | 36 | | |
|------+--------+--------+--------+-------+---------+--------|
| 10MB | 512K x | NONE | 1M x | 1M x | pins 1 | Open |
| | 36 | | 36 | 36 | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 12MB | 1M x | 1M x | 1M x | NONE | Open | Open |
| | 36 | 36 | 36 | | | |
|------+--------+--------+--------+-------+---------+--------|
| 12MB | 2M x | NONE | 1M x | NONE | pins 1 | Open |
| | 36 | | 36 | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 16MB | 1M x | 1M x | 1M x | 1M x | Open | Open |
| | 36 | 36 | 36 | 36 | | |
|------+--------+--------+--------+-------+---------+--------|
| 16MB | 2M x | NONE | 1M x | 1M x | pins 1 | Open |
| | 36 | | 36 | 36 | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 16MB | 2M x | 2M x | NONE | NONE | pins 2 | Closed |
| | 36 | 36 | | | & 3 | |
|------+--------+--------+--------+-------+---------+--------|
| 16MB | 4M x | NONE | NONE | NONE | Open | Open |
| | 36 | | | | | |
|------+--------+--------+--------+-------+---------+--------|
| 18MB | 256K x | 256K x | 256K x | NONE | Open | Open |
| | 36 | 36 | 36 | | | |
|------+--------+--------+--------+-------+---------+--------|
| 18MB | 512K x | NONE | 4M x | NONE | pins 1 | Open |
| | 36 | | 36 | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 20MB | 1M x | 4M x | NONE | NONE | Open | Open |
| | 36 | 36 | | | | |
|------+--------+--------+--------+-------+---------+--------|
| 24MB | 1M x | 1M x | 4M x | NONE | Open | Open |
| | 36 | 36 | 36 | | | |
|------+--------+--------+--------+-------+---------+--------|
| 24MB | 2M x | NONE | 4M x | NONE | pins 1 | Open |
| | 36 | | 36 | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 32MB | 4M x | 4M x | NONE | NONE | Open | Open |
| | 36 | 36 | | | | |
|------+--------+--------+--------+-------+---------+--------|
| 32MB | 8M x | NONE | NONE | NONE | pins 1 | Open |
| | 36 | | | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 36MB | 1M x | 4M x | 4M x | NONE | Open | Open |
| | 36 | 36 | 36 | | | |
|------+--------+--------+--------+-------+---------+--------|
| 40MB | 1M x | 1M x | 4M x | 4M x | Open | Open |
| | 36 | 36 | 36 | 36 | | |
|------+--------+--------+--------+-------+---------+--------|
| 40MB | 2M x | NONE | 4M x | 4M x | pins 1 | Open |
| | 36 | | 36 | 36 | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 40MB | 2M x | 8M x | NONE | NONE | pins 2 | Closed |
| | 36 | 36 | | | & 3 | |
|------+--------+--------+--------+-------+---------+--------|
| 48MB | 4M x | 4M x | 4M x | NONE | Open | Open |
| | 36 | 36 | 36 | | | |
|------+--------+--------+--------+-------+---------+--------|
| 48MB | 8M x | NONE | 4M x | NONE | pins 1 | Open |
| | 36 | | 36 | | & 2 | |
|------+--------+--------+--------+-------+---------+--------|
| 64MB | 4M x | 4M x | 4M x | 4M x | Open | Open |
| | 36 | 36 | 36 | 36 | | |
|------+--------+--------+--------+-------+---------+--------|
| 64MB | 8M x | 8M x | NONE | NONE | pins 2 | Closed |
| | 36 | 36 | | | & 3 | |
|------+--------+--------+--------+-------+---------+--------|
| 64MB | 8M x | NONE | 4M x | 4M x | pins 1 | Open |
| | 36 | | 36 | 36 | & 2 | |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | Bank 0 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | SR1 | SR2 | SR3 | SR4 | SR5 |
|-------+------------+----------+----------+--------+--------|
| 64KB | pins 1 & 2 | pins 1 & | pins 2 & | pins 1 | pins 1 |
| | | 2 | 3 | & 2 | & 2 |
|-------+------------+----------+----------+--------+--------|
| 128KB | pins 1 & 2 | pins 2 & | pins 1 & | pins 1 | pins 2 |
| | | 3 | 2 | & 2 | & 3 |
|-------+------------+----------+----------+--------+--------|
| 256KB | pins 2 & 3 | pins 2 & | pins 2 & | pins 2 | pins 2 |
| | | 3 | 3 | & 3 | & 3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 80486DX/80486DX2 | 80486SX | 80487SX/ODP586SX |
|----------+------------------+-----------+------------------|
| T3JP1A | Closed | Open | Open |
|----------+------------------+-----------+------------------|
| T3JP1B | Open | Closed | Open |
|----------+------------------+-----------+------------------|
| T3JP1C | Open | Open | Closed |
|----------+------------------+-----------+------------------|
| T3JP2A | Closed | Open | Open |
|----------+------------------+-----------+------------------|
| T3JP2B | Open | Closed | Open |
|----------+------------------+-----------+------------------|
| T3JP2C | Open | Open | Closed |
|----------+------------------+-----------+------------------|
| T3JP3A | Closed | Open | Open |
|----------+------------------+-----------+------------------|
| T3JP3B | Open | Closed | Open |
|----------+------------------+-----------+------------------|
| T3JP3C | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP1 | JP2 | JP3 | JP4 |
|------------+-----------+-----------+-----------+-----------|
| 20MHz | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 | 3 | 3 | 3 |
|------------+-----------+-----------+-----------+-----------|
| 25/50i MHz | pins 2 & | pins 2 & | pins 1 & | pins 1 & |
| | 3 | 3 | 2 | 2 |
|------------+-----------+-----------+-----------+-----------|
| 33/66i MHz | pins 1 & | pins 2 & | pins 1 & | pins 1 & |
| | 2 | 3 | 2 | 2 |
|------------+-----------+-----------+-----------+-----------|
| 40MHz | pins 1 & | pins 1 & | pins 2 & | pins 2 & |
| | 2 | 2 | 3 | 3 |
|------------+-----------+-----------+-----------+-----------|
| 50MHz | pins 2 & | pins 2 & | pins 1 & | pins 2 & |
| | 3 | 3 | 2 | 3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA LOCAL BUS CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JP9 | JP10 |
|-----------+---------------+-------------------+------------|
| <=33MHz | 0 wait states | pins 1 & 2 closed | pins 1 & 2 |
| | | | closed |
|-----------+---------------+-------------------+------------|
| >33MHz | 1 wait state | pins 2 & 3 closed | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+