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# ROBOTECH, INC.
GMB-486UN
Processor 80486SX/80486DX/80486DX2
Processor Speed 25/33/50/66MHz
Chip Set UMC
Max. onboard DRAM 32MB
Cache 32/64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | CN1 | Reset switch | CN6 |
|------------------+----------+-------------------+----------|
| Turbo LED | CN4 | Speaker | CN7 |
|------------------+----------+-------------------+----------|
| Turbo switch | CN5 | Power LED & | CN8 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Setting |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP2 | 1 & 2 closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP2 | 2 & 3 closed |
|---+--------------------------------+--------+--------------|
| » | Hardware Emulate KBGA20 | JP10 | 1 & 2 closed |
|---+--------------------------------+--------+--------------|
| | Keyboard controller 8042 | JP10 | 2 & 3 closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | JP12 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP12 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|-----------+------------------------+-----------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|-----------+------------------------+-----------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|-----------+------------------------+-----------------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 |
|-----------+------------------------+-----------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|-----------+------------------------+-----------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EPROM TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP3 | JP7 | JP9 | JP13 |
|--------------+---------+---------+---------------+---------|
| 80486SX-25 | 2 & 3 | Open | 2 & 3 | 2 & 3 |
|--------------+---------+---------+---------------+---------|
| 80486DX-33 | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 | 1 & 2 |
|--------------+---------+---------+---------------+---------|
| 80486DX-50 | 2 & 3 | 1 & 2 | 1 & 2, 3 & 4 | 1 & 2 |
|--------------+---------+---------+---------------+---------|
| 80486DX2-50 | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 | 1 & 2 |
|--------------+---------+---------+---------------+---------|
| 80486DX2-66 | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+--------------+----------------|
| 32KB | (4) 8K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+--------------+----------------|
| 64KB | (4) 8K x 8 | 8K x 8 | (1) 8K x 8 |
|------------+---------------+--------------+----------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+--------------+----------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE SIZE CONFIGURATION |
|------------------------------------------------------------|
| Size | JP22 | JP23 | JP25 | JP26 |
|-----------+----------+----------+----------------+---------|
| 32KB | 2 & 3 | Open | 2 & 3 | 2 & 3 |
|-----------+----------+----------+----------------+---------|
| 64KB | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 | 1 & 2 |
|-----------+----------+----------+----------------+---------|
| 128KB | 2 & 3 | 1 & 2 | 1 & 2, 3 & 4 | 1 & 2 |
|-----------+----------+----------+----------------+---------|
| 256KB | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE SIZE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | JP27 | JP28 |
|-------+---------------------------+------------------------|
| 32KB | 1 & 2, 3 & 4, 5 & 6, 7 & | Open |
| | 8, 9 & 10 | |
|-------+---------------------------+------------------------|
| 64KB | Open | 1 & 2, 3 & 4, 5 & 6, 7 |
| | | & 8, 9 & 10 |
|-------+---------------------------+------------------------|
| 128KB | Open | Open |
|-------+---------------------------+------------------------|
| 256KB | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE SIZE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | JP29 | JP30 |
|-------+---------------------------+------------------------|
| 32KB | Open | Open |
|-------+---------------------------+------------------------|
| 64KB | Open | Open |
|-------+---------------------------+------------------------|
| 128KB | 1 & 2, 3 & 4, 5 & 6, 7 & | Open |
| | 8, 9 & 10 | |
|-------+---------------------------+------------------------|
| 256KB | Open | 1 & 2, 3 & 4, 5 & 6, 7 |
| | | & 8, 9 & 10 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+