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# UNIDENTIFIED
A486DX4/SIS III
Processor AM486SX/80486SX/CX486DX/AM486DX/80486DX/AM486DX2/
80486DX2/AM486DX4/80486DX4
Processor 20/25/33/40/50(internal)/50/66(internal)/75(internal)/
Speed 100(internal)MHz
Chip Set SIS
Video Chip None
Set
Maximum 64MB
Onboard
Memory
Maximum None
Video
Memory
Cache 32/64/128/256/512KB
BIOS AMI
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (3)
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Power LED & | J1 | Power LED | LED1 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | J2 | Turbo switch | S1 |
|---------------+----------+----------------------+----------|
| Turbo LED | J4 | 32-bit VESA local | SL1 - |
| | | bus slots | SL3 |
|---------------+----------+----------------------+----------|
| Reset switch | J5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | J7 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | J9 | Closed |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | J11 | Open |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | J12 | Open |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP17 | Pins 1 & 2 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| | RC pin used for break switch | JP20 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | RC pin used for RC | JP20 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CPU type select any CPU type | JP27 | Open |
|---+---------------------------------+-------+--------------|
| | CPU type select CX486S2 only | JP27 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select CGA | JP38 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select | JP38 | Open |
| | monochrome/EGA/VGA | | |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP39 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP39 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP43 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP71 | Open |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Flash BIOS not installed | JP73 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS installed | JP73 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP74 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP75 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP78 | Pins 1 & 2 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP79 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| | Turbo disabled | TBSW | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Turbo enabled | TBSW | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Turbo enabled through S1 | TBSW | Pins 4 & 5 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION 1 |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 1MB | (4) 256K x 9 |
|----------------------------+-------------------------------|
| 4MB | (4) 1M x 9 |
|----------------------------+-------------------------------|
| 16MB | (4) 4M x 9 |
|----------------------------+-------------------------------|
| 64MB | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION 2 |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 |
|------------------+--------------------+--------------------|
| 1MB | (1) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 2MB | (1) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (1) 512K x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION 2 (CON’T) |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Configuration | JP45 | JP46 |
|--------------------+--------------------+------------------|
| 1 | Pins 2 & 3 closed | Closed |
|--------------------+--------------------+------------------|
| 2 | Pins 1 & 2 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+---------------+--------------|
| 32KB | (4) 8K x 8 | None | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 128KB | (4) 32K x 8 | None | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (B) | (4) 64K x 8 | None | (1) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 512KB | (4) 128K x 8 | None | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP30 | JP31 | JP32 | JP34 | JP35 | JP36 | JP81 |
|--------+-------+-------+-------+------+------+------+------|
| 32KB | 1 & 2 | 1 & 2 | 1 & 2 | Open | 1 & | 1 & | 2 & |
| | | | | | 2 | 2 | 3 |
|--------+-------+-------+-------+------+------+------+------|
| 64KB | 2 & 3 | 1 & 2 | 1 & 2 | 1 & | 2 & | 1 & | 2 & |
| | | | | 2 | 3 | 2 | 3 |
|--------+-------+-------+-------+------+------+------+------|
| 128KB | 2 & 3 | 2 & 3 | 1 & 2 | 2 & | 1 & | 2 & | 2 & |
| | | | | 3, 4 | 2 | 3 | 3 |
| | | | | & 5 | | | |
|--------+-------+-------+-------+------+------+------+------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 1 & | 2 & | 2 & | 2 & |
| (A) | | | | 2, 3 | 3 | 3 | 3 |
| | | | | & 4 | | | |
|--------+-------+-------+-------+------+------+------+------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & | 1 & | 2 & | 2 & |
| (B) | | | | 3, 4 | 2 | 3 | 3 |
| | | | | & 5 | | | |
|--------+-------+-------+-------+------+------+------+------|
| 512KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & | 1 & | 2 & | 1 & |
| | | | | 3, 4 | 2 | 3 | 2 |
| | | | | & 5 | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 |
|---------------+--------------+--------------+--------------|
| 20MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 33MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 66iMHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 100iMHz | Open | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | J13 | JP8 | JP10 | JP12 | JP13 |
|-----------+----------+---------+---------+--------+--------|
| AM486SX | Closed | 2 & 3 | 2 & 3 | Open | Open |
|-----------+----------+---------+---------+--------+--------|
| 80486SX | Closed | 2 & 3 | 2 & 3 | Open | Open |
|-----------+----------+---------+---------+--------+--------|
| CX486DX | Open | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|-----------+----------+---------+---------+--------+--------|
| AM486DX | Closed | 2 & 3 | 2 & 3 | Open | Open |
|-----------+----------+---------+---------+--------+--------|
| 80486DX | Closed | 2 & 3 | 2 & 3 | Open | Open |
|-----------+----------+---------+---------+--------+--------|
| AM486DX2 | Closed | 2 & 3 | 2 & 3 | Open | Open |
|-----------+----------+---------+---------+--------+--------|
| 80486DX2 | Closed | 2 & 3 | 2 & 3 | Open | Open |
|-----------+----------+---------+---------+--------+--------|
| AM486DX4 | Closed | 2 & 3 | Open | Open | Open |
|-----------+----------+---------+---------+--------+--------|
| 80486DX4 | Closed | 2 & 3 | Open | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP18 | JP19 | JP24 | JP25 | JP28 |
|----------+--------+--------+--------+--------------+-------|
| AM486SX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|----------+--------+--------+--------+--------------+-------|
| 80486SX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|----------+--------+--------+--------+--------------+-------|
| CX486DX | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2, 3 & 4 | Open |
|----------+--------+--------+--------+--------------+-------|
| AM486DX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|----------+--------+--------+--------+--------------+-------|
| 80486DX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|----------+--------+--------+--------+--------------+-------|
| AM486DX2 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|----------+--------+--------+--------+--------------+-------|
| 80486DX2 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|----------+--------+--------+--------+--------------+-------|
| AM486DX4 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|----------+--------+--------+--------+--------------+-------|
| 80486DX4 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP29 | JP33 | JP37 | JP40 |
|-----------+--------+--------------+-------+----------------|
| AM486SX | 3 & 4 | 2 & 3 | Open | 1 & 2 or 2 & 3 |
|-----------+--------+--------------+-------+----------------|
| 80486SX | 3 & 4 | 2 & 3 | Open | 1 & 2 or 2 & 3 |
|-----------+--------+--------------+-------+----------------|
| CX486DX | 2 & 3 | 1 & 2 | 3 & 4 | 1 & 2 |
|-----------+--------+--------------+-------+----------------|
| AM486DX | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 |
|-----------+--------+--------------+-------+----------------|
| 80486DX | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 |
|-----------+--------+--------------+-------+----------------|
| AM486DX2 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 |
|-----------+--------+--------------+-------+----------------|
| 80486DX2 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 |
|-----------+--------+--------------+-------+----------------|
| AM486DX4 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 |
|-----------+--------+--------------+-------+----------------|
| 80486DX4 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU MULTIPLIER SELECTION |
|------------------------------------------------------------|
| Multiplier | JP44 |
|----------------------------+-------------------------------|
| 2x | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2.5x | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | Setting | JP80 |
|------------------+--------------------+--------------------|
| 3.45v | UMB on board | Auto detect |
|------------------+--------------------+--------------------|
| 5v | UMB on board | Auto detect |
|------------------+--------------------+--------------------|
| 3.45v | UMB not on board | No support |
|------------------+--------------------+--------------------|
| 5v | UMB not on board | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS WAIT STATE SELECTION |
|------------------------------------------------------------|
| Setting | JP4 |
|----------------------------+-------------------------------|
| 0 | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP3 |
|----------------------------+-------------------------------|
| <= 33MHz | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| >33 MHz | Pins 2 & 3 closed |
+------------------------------------------------------------+