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# SILICON STAR INTERNATIONAL, INC.
AH4/AH4T (REV. 1.2)
Processor 80486SX/SL80486SX/CX486M7/80486DX/SL80486DX/CX486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/80486DX4
Processor 20/25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentifed
Max. 128MB
Onboard
DRAM
Cache 128/256/512KB
BIOS Award
Dimensions 330mm x 218mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| External battery | J1 | Reset switch | JW3 |
|--------------------+----------+-----------------+----------|
| Green PC connector | JP45 | Turbo LED | JW4 |
| | pins 7 - | | |
| | 8 | | |
|--------------------+----------+-----------------+----------|
| Power LED & | JW1 | Turbo switch | JW5 |
| keylock | | | |
|--------------------+----------+-----------------+----------|
| Speaker | JW2 | 32-bit VESA | SL1 - |
| | | local bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | JP16 | pins 1 & 2 |
| | | | closed |
|----+---------------------------------+--------+------------|
| | CMOS memory clear | JP16 | pins 2 & 3 |
| | | | closed |
|----+---------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | N/A |
| | alter | | |
|----+---------------------------------+--------+------------|
| » | Factory configured - do not | JP19 | pins 1 & 2 |
| | alter | | closed |
|----+---------------------------------+--------+------------|
| » | Factory configured - do not | JP23 | pins 1 & 2 |
| | alter | | closed |
|----+---------------------------------+--------+------------|
| » | Factory configured - do not | JP26 | Open |
| | alter | | |
|----+---------------------------------+--------+------------|
| » | Factory configured - do not | JP30 | N/A |
| | alter | | |
|----+---------------------------------+--------+------------|
| » | Factory configured - do not | JP31 | N/A |
| | alter | | |
|----+---------------------------------+--------+------------|
| » | Factory configured - do not | JP42 | Closed |
| | alter | | |
|------------------------------------------------------------|
| Note: The locations of JP19, JP23 & JP42 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+---------------+-------------+------------+----------|
| 1MB | (1) 256K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 256K x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 512K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 512K x 36 | (1) 512K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 12MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 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) 256K x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 256K x 36 | (1) 256K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 4M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 36MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 16M x | NONE | NONE | NONE |
| | 36 | | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 65MB | (1) 256K x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 16M x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 64K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP4 | JP40 | JP41 |
|----------+----------+----------+---------+--------+--------|
| 128KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 512KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 512KB | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP8 | JP9 | JP11 | JP12 | JP14 |
|-------------+---------+---------+--------+--------+--------|
| 80486SX | 2 & 3 | Open | Open | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| SL80486SX | 2 & 3 | Open | Open | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| CX486M7 | 1 & 2 | Closed | 2 & 3 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|-------------+---------+---------+--------+--------+--------|
| 80486DX | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| SL80486DX | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| CX486DX2 | 1 & 2 | Closed | 2 & 3 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|-------------+---------+---------+--------+--------+--------|
| AM486DX2 | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| 80486DX2 | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| SL80486DX2 | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| AM486DX4 | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| 80486DX4 | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed |
| position. SL80486DX/DX2 is only available on the AH4T |
| mainboard |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP15 | JP21 | JP22 | JP24 | JP25 |
|-------------+---------+---------+--------+--------+--------|
| 80486SX | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| SL80486SX | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| CX486M7 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| 80486DX | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| SL80486DX | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| CX486DX2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 |
|-------------+---------+---------+--------+--------+--------|
| AM486DX2 | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| 80486DX2 | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| SL80486DX2 | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| AM486DX4 | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|-------------+---------+---------+--------+--------+--------|
| 80486DX4 | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed |
| position. SL80486DX/DX2 is only available on the AH4T |
| mainboard |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP32 | JP46 | JP48 | JP49 | JP50 | JP62 |
|------------+-------+-------+-------+-------+------+--------|
| 80486SX | 1 & 2 | 2 & 3 | 2 & 3 | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+-------+-------+-------+------+--------|
| SL80486SX | 1 & 2 | 2 & 3 | 2 & 3 | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+-------+-------+-------+------+--------|
| CX486M7 | 1 & 2 | 1 & 2 | 2 & 3 | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+-------+-------+-------+------+--------|
| 80486DX | 1 & 2 | 2 & 3 | 2 & 3 | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+-------+-------+-------+------+--------|
| SL80486DX | 1 & 2 | 2 & 3 | 2 & 3 | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+-------+-------+-------+------+--------|
| CX486DX2 | 1 & 2 | 1 & 2 | 1 & 2 | Open | 1 & | Open |
| | | | | | 2 | |
|------------+-------+-------+-------+-------+------+--------|
| AM486DX2 | 1 & 2 | 2 & 3 | 1 & 2 | Open | 1 & | Open |
| | | | | | 2 | |
|------------+-------+-------+-------+-------+------+--------|
| 80486DX2 | 1 & 2 | 2 & 3 | 2 & 3 | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+-------+-------+-------+------+--------|
| SL80486DX2 | 1 & 2 | 2 & 3 | 2 & 3 | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+-------+-------+-------+------+--------|
| AM486DX4 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & | Closed |
| | | | | | 2 | |
|------------+-------+-------+-------+-------+------+--------|
| 80486DX4 | Open | 2 & 3 | 1 & 2 | 1 & 2 | 1 & | Open |
| | | | | | 2 | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed |
| position. SL80486DX/DX2 is only available on the AH4T |
| mainboard |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 |
|---------------+--------------+--------------+--------------|
| 20MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 33MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 100iMHz | Open | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP53 | JP54 | JP55 | JP56 |
|-----------+------------+-----------+-----------+-----------|
| 3.3v | Closed | Open | Open | Open |
|-----------+------------+-----------+-----------+-----------|
| 3.45v | Open | Closed | Open | Open |
|-----------+------------+-----------+-----------+-----------|
| 3.6v | Open | Open | Closed | Open |
|-----------+------------+-----------+-----------+-----------|
| 4v | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP29 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+