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# SOYO TECHNOLOGY CO., LTD.
SY-045A2/A5
Processor 80486SX/80486SX2/CX486DX/U5S/80486DX/CX486DX2/AM486DX2/
80486DX2/AM486DX4/80486DX4/P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Max. 256MB
Onboard
DRAM
Cache 256/512/1024KB
BIOS Award
Dimensions 330mm x 218mm
I/O 32-bit VESA local bus slot, 32-bit PCI slots (4), IDE interfaces (2),
Options parallel port, serial ports (2)
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Serial port 1 | CN1 | Reset switch | J19 |
|------------------+----------+-------------------+----------|
| Serial port 2 | CN2 | External battery | J20 |
|------------------+----------+-------------------+----------|
| Parallel port | CN3 | Turbo switch | J21 |
|------------------+----------+-------------------+----------|
| Floppy drive | CN4 | Turbo LED | J22 |
| interface | | | |
|------------------+----------+-------------------+----------|
| IDE interface | CN5 | IDE interface LED | JP17 |
| (primary) | | (secondary) | |
|------------------+----------+-------------------+----------|
| IDE interface | CN6 | IDE interface LED | JP18 |
| (secondary) | | (primary) | |
|------------------+----------+-------------------+----------|
| Power LED & | J17 | 32-bit PCI slots | PCI1 - |
| keylock | | | PCI4 |
|------------------+----------+-------------------+----------|
| Speaker | J18 | 32-bit VESA local | SL1 |
| | | bus slot | |
|------------------------------------------------------------|
| Note: The locations of J19, J21, and J22 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+----------+------------|
| » | Factory configured - do not | J7 | Open |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP1 | N/A |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP2 | N/A |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | Monitor type select color | JP3 | Closed |
|----+-------------------------------+----------+------------|
| | Monitor type select | JP3 | Open |
| | monochrome | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP4 | N/A |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | CMOS memory normal operation | JP5 | pins 1 & 2 |
| | | | closed |
|----+-------------------------------+----------+------------|
| | CMOS memory clear | JP5 | pins 2 & 3 |
| | | | closed |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP6 | Closed |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP7 | Open |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP12 | pins 1 & 2 |
| | alter | | closed |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP13 | N/A |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | CPU signal type select SMOUT | JP15 | pins 1 & 2 |
| | | | closed |
|----+-------------------------------+----------+------------|
| | CPU signal type select STPCLK | JP15 | pins 2 & 3 |
| | | | closed |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP19 | N/A |
| | alter | | |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP27 | pins 2 & 3 |
| | alter | | closed |
|----+-------------------------------+----------+------------|
| » | Factory configured - do not | JP28 | pins 2 & 3 |
| | alter | | closed |
|------------------------------------------------------------|
| Note: The locations of JP1, JP2, JP3, JP4, JP13, JP19, and |
| JP29 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 512K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 512K x | (1) 512K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 256K x | (1) 1M x 36 | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 512K x | (1) 512K x | (1) 512K x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 512K x | (1) 512K x | (1) 512K x | (1) 512K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 512K x | (1) 512K x | (1) 1M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 256K x | (1) 4M x 36 | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 512K x | (1) 512K x | (1) 4M x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 512K x | (1) 512K x | (1) 1M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 2M 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 |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 512K x | (1) 512K x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 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 | |
|-------+-------------+------------+------------+------------|
| 70MB | (1) 16M x | (1) 512K x | (1) 512K x | (1) 512K x |
| | 36 | 36 | 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 | |
|-------+-------------+------------+------------+------------|
| 88MB | (1) 16M x | (1) 2M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 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 | |
|-------+-------------+------------+------------+------------|
| 112MB | (1) 16M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 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 |
|-------+-------------+------------+------------+------------|
| 132MB | (1) 16M x | (1) 16M x | (1) 512K x | (1) 512K x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 144MB | (1) 16M x | (1) 16M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | (1) 16M x | (1) 16M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | (1) 16M x | (1) 8M x | (1) 8M x | (1) 8M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 192MB | (1) 16M x | (1) 16M x | (1) 16M x | NONE |
| | 36 | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 192MB | (1) 16M x | (1) 16M x | (1) 8M x | (1) 8M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 194MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 512K x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 200MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 2M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 208MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 224MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 8M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 256MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 16M x |
| | 36 | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 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) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 128K x 8 | (4) 128K x 8 | (1) 64K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP25 | JP26 | JP29 |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 512KB | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 512KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 1MB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP30 | JP31 | JP32 | JP33 | JP34 | JP36 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486SX | 3 & 4 | Open | 2 & 3 | Open | Open | Open |
|------------+-------+-------+-------+-------+-------+-------|
| 80486SX2 | 3 & 4 | Open | 2 & 3 | Open | Open | Open |
|------------+-------+-------+-------+-------+-------+-------|
| CX486DX | 2 & 3 | 3 & 4 | 1 & | 2 & 3 | Open | Open |
| (5v) | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| U5S | Open | 1 & | 1 & | 3 & 4 | Open | Open |
| | | 2, 3 | 2, 3 | | | |
| | | & 4 | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX | 3 & 4 | 3 & 4 | 1 & | Open | Open | Open |
| | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| CX486DX2 | 2 & 3 | 3 & 4 | 1 & | 2 & 3 | Open | Open |
| (3.6v) | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| CX486DX2 | 2 & 3 | 3 & 4 | 1 & | 2 & 3 | Open | Open |
| (4v) | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| CX486DX2 | 2 & 3 | 3 & 4 | 1 & | 2 & 3 | Open | Open |
| (5v) | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DX2 | 3 & 4 | 3 & 4 | 1 & | Open | 2 & 3 | Open |
| (3.45v) | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DX2 | 3 & 4 | 3 & 4 | 1 & | Open | 2 & 3 | Open |
| (5v) | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DX2 | 3 & 4 | 3 & 4 | 1 & | Open | 2 & 3 | 1 & 2 |
| | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX2 | 3 & 4 | 3 & 4 | 1 & | Open | Open | Open |
| | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DX4 | 3 & 4 | 3 & 4 | 1 & | Open | 1 & 2 | Open |
| (3.45v) | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DX4 | 3 & 4 | 3 & 4 | 1 & | Open | 1 & 2 | 1 & 2 |
| | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX4 | 3 & 4 | 3 & 4 | 1 & | Open | Open | Open |
| | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| P24D | 1 & | 3 & 4 | 1 & | Open | 1 & 2 | Open |
| | 2, 3 | | 2, 3 | | | |
| | & 4 | | & 4 | | | |
|------------+-------+-------+-------+-------+-------+-------|
| Pentium | 3 & 4 | 2 & 3 | 1 & | 1 & 2 | Open | 1 & 2 |
| Overdrive | | | 2, 3 | | | |
| | | | & 4 | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP37 | JP38 | JP39 | JP40 | JP41 |
|-----------------+-------+-------+-------+----------+-------|
| 80486SX | 4 & 5 | Open | Open | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| 80486SX2 | 4 & 5 | Open | Open | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| CX486DX (5v) | 2 & 3 | 2 & 3 | Open | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| U5S | Open | Open | Open | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| 80486DX | 4 & 5 | Open | Open | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| CX486DX2 (3.6v) | 2 & 3 | 2 & 3 | 3 & 4 | 3 & 4, 5 | Open |
| | | | | & 6 | |
|-----------------+-------+-------+-------+----------+-------|
| CX486DX2 (4v) | 2 & 3 | 2 & 3 | 5 & 6 | 3 & 4, 5 | Open |
| | | | | & 6 | |
|-----------------+-------+-------+-------+----------+-------|
| CX486DX2 (5v) | 2 & 3 | 2 & 3 | Open | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| AM486DX2 | 4 & 5 | Open | 1 & 2 | 1 & 2, 3 | Open |
| (3.45v) | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| AM486DX2 (5v) | 4 & 5 | Open | 1 & 2 | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| AM486DX2 | 4 & 5 | Open | 1 & 2 | 3 & 4, 5 | 2 & 3 |
| | | | | & 6 | |
|-----------------+-------+-------+-------+----------+-------|
| 80486DX2 | 4 & 5 | Open | Open | 1 & 2, 3 | Open |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| AM486DX4 | 4 & 5 | Open | 1 & 2 | 1 & 2, 3 | Open |
| (3.45v) | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| AM486DX4 | 4 & 5 | Open | 1 & 2 | 3 & 4, 5 | 2 & 3 |
| | | | | & 6 | |
|-----------------+-------+-------+-------+----------+-------|
| 80486DX4 | 4 & 5 | Open | 1 & 2 | 3 & 4, 5 | Open |
| | | | | & 6 | |
|-----------------+-------+-------+-------+----------+-------|
| P24D | 4 & 5 | 1 & 2 | Open | 1 & 2, 3 | 1 & 2 |
| | | | | & 4 | |
|-----------------+-------+-------+-------+----------+-------|
| Pentium | 1 & 2 | 1 & 2 | Open | 1 & 2, 3 | Open |
| Overdrive | | | | & 4 | |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP42 | JP43 | JP44 | JP45 | JP46 |
|-------------------+--------+-------+-------+-------+-------|
| 80486SX | 2 & 3 | Open | 1 & 2 | 1 & 2 | 1 & 2 |
|-------------------+--------+-------+-------+-------+-------|
| 80486SX2 | 2 & 3 | Open | 1 & 2 | 1 & 2 | 1 & 2 |
|-------------------+--------+-------+-------+-------+-------|
| CX486DX (5v) | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|-------------------+--------+-------+-------+-------+-------|
| U5S | 2 & 3 | Open | 1 & 2 | 2 & 3 | 4 & 5 |
|-------------------+--------+-------+-------+-------+-------|
| 80486DX | 2 & 3 | Open | 1 & 2 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| CX486DX2 (3.6v) | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|-------------------+--------+-------+-------+-------+-------|
| CX486DX2 (4v) | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|-------------------+--------+-------+-------+-------+-------|
| CX486DX2 (5v) | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|-------------------+--------+-------+-------+-------+-------|
| AM486DX2 (3.45v) | 2 & 3 | Open | 1 & 2 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| AM486DX2 (5v) | 2 & 3 | Open | 1 & 2 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| AM486DX2 | 2 & 3 | Open | 4 & 5 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| 80486DX2 | 2 & 3 | Open | 1 & 2 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| AM486DX4 (3.45v) | 2 & 3 | Open | 1 & 2 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| AM486DX4 | 2 & 3 | Open | 4 & 5 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| 80486DX4 | 2 & 3 | Open | 1 & 2 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| P24D | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 |
|-------------------+--------+-------+-------+-------+-------|
| Pentium Overdrive | 1 & 2 | Open | Open | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP14 | JP21 | JP22 |
|--------------+-------------------+------------+------------|
| 25MHz | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 33MHz | pins 1 & 2 closed | Closed | Closed |
|--------------+-------------------+------------+------------|
| 40MHz | pins 1 & 2 closed | Closed | Open |
|--------------+-------------------+------------+------------|
| 50iMHz | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 66iMHz | pins 1 & 2 closed | Closed | Closed |
|--------------+-------------------+------------+------------|
| 75iMHz | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 80iMHz | pins 1 & 2 closed | Closed | Open |
|--------------+-------------------+------------+------------|
| 100iMHz | pins 1 & 2 closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRQ/DACK CONFIGURATION |
|------------------------------------------------------------|
| DRQ/DACK | JP8 | JP9 | JP10 | JP11 |
|------------+-----------+-----------+-----------+-----------|
| None | Open | Open | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| DRQ3/DACK3 | Closed | Open | Open | Closed |
|------------+-----------+-----------+-----------+-----------|
| DRQ7/DACK7 | Open | Closed | Closed | Open |
+------------------------------------------------------------+