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# MECER CORPORATION
B810C (REV. B)
Processor 80386DX/CX486M6/80486SX/80486DX/80486DX2
Processor Speed 25/33/40/50(internal)/50/66(internal)MHz
Chip Set Unidentified
Max. Onboard DRAM 128MB
Cache 128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options None
NPU Options 80387DX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+-----------+--------------+-----------|
| Auxiliary keyboard | JP1 | Turbo LED | JP27 pins |
| connector | | | 11 - 12 |
|---------------------+-----------+--------------+-----------|
| External battery | JP12 | Turbo switch | JP27 pins |
| | | | 16 - 17 |
|---------------------+-----------+--------------+-----------|
| Power LED & keylock | JP27 pins | Reset switch | JP27 pins |
| | 1 - 5 | | 19 - 20 |
|---------------------+-----------+--------------+-----------|
| Speaker | JP27 pins | | |
| | 7 - 10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | JP10 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP10 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP21 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP22 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP33 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP34 | pins 2 & 3 |
| | alter | | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 65MB | (4) 256K x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 68MB | (4) 1M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 80MB | (4) 4M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP24 | JP25 |
|-------------------+-------------------+--------------------|
| 128KB | Open | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| 256KB | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP2 | JP3 | JP4 | JP11 | JP14 | JP15 |
|------------+-------+-------+-------+-------+-------+-------|
| 80386DX | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| CX486M6-33 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 | Open |
|------------+-------+-------+-------+-------+-------+-------|
| CX486M6-40 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | Open |
|------------+-------+-------+-------+-------+-------+-------|
| CX486M6-33 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 |
| (C6) | | | | | | |
|------------+-------+-------+-------+-------+-------+-------|
| CX486M6-40 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
| (C6) | | | | | | |
|------------+-------+-------+-------+-------+-------+-------|
| 80486SX | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | Open |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX-33 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX-40 | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX-50 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX2 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type |JP16 |JP19 | JP28 | JP29 | JP30 | JP31 | JP32 |
|-------------+-----+-----+------+------+------+------+------|
| 80386DX |2 & 3|2 & 3|Closed| Open | Open |Closed|Closed|
|-------------+-----+-----+------+------+------+------+------|
| CX486M6-33 |1 & 2|2 & 3| Open |Closed|Closed| Open | Open |
|-------------+-----+-----+------+------+------+------+------|
| CX486M6-40 |1 & 2|1 & 2| Open |Closed|Closed| Open | Open |
|-------------+-----+-----+------+------+------+------+------|
| CX486M6-33 |2 & 3|2 & 3| Open | Open | Open |Closed|Closed|
| (C6) | | | | | | | |
|-------------+-----+-----+------+------+------+------+------|
| CX486M6-40 |2 & 3|1 & 2| Open | Open | Open |Closed|Closed|
| (C6) | | | | | | | |
|-------------+-----+-----+------+------+------+------+------|
| 80486SX |1 & 2|2 & 3| Open | Open | Open |Closed|Closed|
|-------------+-----+-----+------+------+------+------+------|
| 80486DX-33 |2 & 3|2 & 3| Open | Open | Open |Closed|Closed|
|-------------+-----+-----+------+------+------+------+------|
| 80486DX-40 |2 & 3|1 & 2| Open | Open | Open |Closed|Closed|
|-------------+-----+-----+------+------+------+------+------|
| 80486DX-50 |2 & 3|2 & 3| Open | Open | Open |Closed|Closed|
|-------------+-----+-----+------+------+------+------+------|
| 80486DX2 |2 & 3|2 & 3| Open | Open | Open |Closed|Closed|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J1 |
|----------------------------+-------------------------------|
| 25MHz | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 40Mhz (80386) | pins 6 & 8 closed |
|----------------------------+-------------------------------|
| 40Mhz (80486) | pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 50iMHz | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 50MHz | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 66iMHz | pins 1 & 2 closed |
+------------------------------------------------------------+