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# SILICON STAR INTERNATIONAL, INC.
AV4 VL-BUS MAIN BOARD
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 220mm x 254mm
I/O Options 32-bit VESA card slot (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+------------+---------------------+----------|
| Keylock | CN1 | External battery | CN6 |
|--------------+------------+---------------------+----------|
| Speaker | CN3 | Reset | CN8 |
|--------------+------------+---------------------+----------|
| Turbo LED | CN4 | Power LED | LED1 |
|--------------+------------+---------------------+----------|
| Turbo switch | CN5/pins 2 | 32-bit VESA card | S1 & S2 |
| | & 3 | (2) | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+----------+------------|
| » | VESA bus speed select | JP8 and | pins 1 & 2 |
| | 20/25/33MHz | JP10 | closed |
|----+-------------------------------+----------+------------|
| | VESA bus speed select 50MHz | JP8 and | pins 2 & 3 |
| | | JP10 | closed |
|----+-------------------------------+----------+------------|
| » | VESA bus wait state select 1 | JP9 and | pins 1 & 2 |
| | | JP11 | closed |
|----+-------------------------------+----------+------------|
| | VESA bus wait states select 0 | JP9 and | pins 2 & 3 |
| | | JP11 | closed |
|----+-------------------------------+----------+------------|
| » | CMOS memory normal operation | JP12 | pins 1 & 2 |
| | | | closed |
|----+-------------------------------+----------+------------|
| | CMOS memory clear | JP12 | pins 2 & 3 |
| | | | closed |
|----+-------------------------------+----------+------------|
| » | Fast gate A20 select enabled | JP17 | pins 1 & 2 |
| | | | closed |
|----+-------------------------------+----------+------------|
| | Fast gate A20 select disabled | JP17 | pins 2 & 3 |
| | | | closed |
|----+-------------------------------+----------+------------|
| » | Monitor type select color | JP18 | closed |
|----+-------------------------------+----------+------------|
| | Monitor type select | JP18 | open |
| | monochrome | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP23 | See note |
| | alter 1 | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP24 | See note |
| | alter 1 | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP25 | See note |
| | alter 1 | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP26 | pins 2 & 3 |
| | alter 1 | | closed |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP27 | pins 2 & 3 |
| | alter | | closed |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP28 | See note |
| | alter 1 | | |
|------------------------------------------------------------|
| Note:The locations of JP23, JP24, and JP25 are unknown |
| |
| Note 1 :JP23 through JP28 are set at the factory depending |
| on whether the R1 or R2 Model is shipped. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG(U14) | TAG(U15) |
|--------+------------+-----------+-------------+------------|
| 64KB | (8) 8K x 8 | Banks 0 & | (1) 8K x 8 | (1) 8K x 8 |
| | | 1 | | |
|--------+------------+-----------+-------------+------------|
| 128KB | (4) 32K x | Bank 0 | (1) 8K x 8 | (1) 8K x 8 |
| | 8 | | | |
|--------+------------+-----------+-------------+------------|
| 256KB | (8) 32K x | Banks 0 & | (1) 32K x 8 | (1) 32K x |
| | 8 | 1 | | 8 |
|------------------------------------------------------------|
| Note:If SRAM is installed at U15 then write-back caching |
| is enabled. |
| |
| If SRAM is installed at U14 and U15 then write-back or |
| write-through caching can be enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 64KB | 128KB | 256KB |
|--------+-----------------+----------------+----------------|
| JP1 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| JP2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| JP3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| JP4 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| JP5 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| JP6 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| JP7 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | Jumper | Jumper | Jumper | Jumper |
| | JP13 | JP14 | JP15 | JP16 |
|------------------+----------+----------+---------+---------|
| 80486DX/80486DX2 | pins 1 & | pins 1 & | closed | closed |
| | 2 closed | 2 closed | | |
|------------------+----------+----------+---------+---------|
| 80487SX | pins 2 & | pins 1 & | closed | closed |
| | 3 closed | 2 closed | | |
|------------------+----------+----------+---------+---------|
| 80486SX (PGA) | open | pins 2 & | open | closed |
| | | 3 closed | | |
|------------------+----------+----------+---------+---------|
| 80486SX (PQFP) | open | pins 2 & | open | open |
| | | 3 closed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | Jumper JP20 | Jumper JP21 | Jumper JP22 |
|------------+---------------+---------------+---------------|
| 20MHz | closed | closed | open |
|------------+---------------+---------------+---------------|
| 25MHz | closed | open | closed |
|------------+---------------+---------------+---------------|
| 33MHz | open | closed | closed |
|------------+---------------+---------------+---------------|
| 50MHz | open | closed | open |
+------------------------------------------------------------+