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# GIGA-BYTE TECHNOLOGY CO., LTD
GA-386UM 33/40 MAIN BOARD
Processor 80386DX
Processor Speed 33/40MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 220mm x 260mm
I/O Options None
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+-----------+--------------------+----------|
| Power LED & | J1 | Turbo switch | J4 |
| keylock | | | |
|----------------+-----------+--------------------+----------|
| Speaker | J2 | Turbo LED | J5 |
|----------------+-----------+--------------------+----------|
| Reset switch | J3 | External battery | J11 |
|------------------------------------------------------------|
| Note:Board may be supplied with either a PGA (socketed) or |
| PQFP (surface mounted) CPU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | NPU absent | J7 | open |
|---+--------------------------------+--------+--------------|
| | NPU present | J7 | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | J8 | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | J8 | open |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | J9 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | J9 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | WC1 | WC2 | WC3 | WC4 | WC5 |
|-------+-----------+--------+--------+-----------+----------|
| 64KB | pins 2 & | open | open | pins 1 & | pins 1 & |
| | 3 closed | | | 2 closed | 2 closed |
|-------+-----------+--------+--------+-----------+----------|
| 128KB | pins 1 & | open | closed | pins 2 & | pins 1 & |
| | 2 closed | | | 3 closed | 2 closed |
|-------+-----------+--------+--------+-----------+----------|
| 256KB | pins 2 & | closed | closed | pins 2 & | pins 2 & |
| | 3 closed | | | 3 closed | 3 closed |
+------------------------------------------------------------+