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# SOYO COMPUTER CO., LTD.
SY-033 A2/A5/A1M
Device Type Mainboard
Processor Pentium
Processor Speed 75/90/100MHz
Chip Set Unidentified
Maximum Onboard Memory 128MB
Cache 256/512/1024KB
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options 32-bit PCI slots (4)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| Green PC connector | BSW1 | Reset switch | J19 |
|--------------------+----------+-----------------+----------|
| 5v power | J2 | Turbo switch | J21 |
|--------------------+----------+-----------------+----------|
| 3.3v power | J3 | Turbo LED | J22 |
|--------------------+----------+-----------------+----------|
| Power LED & | J17 | Chassis fan | JP9 |
| keylock | | power | |
|--------------------+----------+-----------------+----------|
| Speaker | J18 | 32-bit PCI | PC1 – |
| | | slots | PC4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+-------+---------------|
| » | BIOS type select EPROM | JP1 | Pins 2 & 3, 4 |
| | | | & 5 closed |
|---+--------------------------------+-------+---------------|
| | BIOS type select flash | JP1 | Pins 1 & 2, 5 |
| | | | & 6 closed |
|---+--------------------------------+-------+---------------|
| » | Monitor type select color | JP3 | Closed |
|---+--------------------------------+-------+---------------|
| | Monitor type select monochrome | JP3 | Open |
|---+--------------------------------+-------+---------------|
| » | Factory configured - do not | JP5 | Unidentified |
| | alter | | |
|---+--------------------------------+-------+---------------|
| » | Factory configured - do not | JP7 | Pins 2 & 3 |
| | alter | | closed |
|---+--------------------------------+-------+---------------|
| » | External fan controlled by | JP8 | Pins 1 & 2 |
| | JP18 | | closed |
|---+--------------------------------+-------+---------------|
| | External fan always enabled | JP8 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| » | Factory configured - do not | JP11 | Pins 1 & 2 |
| | alter | | closed |
|---+--------------------------------+-------+---------------|
| » | Factory configured - do not | JP12 | Pins 2 & 3 |
| | alter | | closed |
|---+--------------------------------+-------+---------------|
| » | Factory configured - do not | JP13 | Pins 1 & 2 |
| | alter | | closed |
|---+--------------------------------+-------+---------------|
| » | Clock generator select stopped | JP17 | Pins 1 & 2 |
| | by STPCLK | | closed |
|---+--------------------------------+-------+---------------|
| | Clock generator select stopped | JP17 | Pins 2 & 3 |
| | by SMOUT | | closed |
|---+--------------------------------+-------+---------------|
| » | Fan control select stopped by | JP18 | Pins 1 & 2 |
| | STPCLK | | closed |
|---+--------------------------------+-------+---------------|
| | Fan control select stopped by | JP18 | Pins 2 & 3 |
| | SMOUT | | closed |
|---+--------------------------------+-------+---------------|
| » | Factory configured - do not | JP20 | Pins 2 & 3 |
| | alter | | closed |
|---+--------------------------------+-------+---------------|
| » | Factory configured - do not | SLED | Unidentified |
| | alter | | |
|------------------------------------------------------------|
| Note: The location of JP8 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 512K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 1M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP15 | JP16 |
|------------------+--------------------+--------------------|
| 2MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 4MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 4MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 8MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 8MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 12MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 16MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 16MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 20MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 24MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 32MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 32MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 36MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 40MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 48MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 64MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 64MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 72MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 96MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 128MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 128MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (8) 64K x 8 | (1) 16K x 8 |
|------------------+--------------------+--------------------|
| 1MB | (8) 128K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 | JP14 | JP20 |
|---------+-------------------+-------------------+----------|
| 256KB | Pins 2 & 3 closed | Pins 1 & 2 closed | Open |
|---------+-------------------+-------------------+----------|
| 512KB | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
|---------+-------------------+-------------------+----------|
| 1MB | Pins 2 & 3 closed | Pins 2 & 3 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP2 | JP4 | JP6 |
| speed | speed | | | | |
|---------+----------+------------+--------+--------+--------|
| 75MHz | 50MHz | 1.5x | Open | Open | Open |
|---------+----------+------------+--------+--------+--------|
| 90MHz | 60MHz | 1.5x | Closed | Open | Open |
|---------+----------+------------+--------+--------+--------|
| 100MHz | 66MHz | 1.5x | Closed | Closed | Closed |
+------------------------------------------------------------+