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# MECER CORPORATION
B860/B860 (REV. A)
Processor CX486SX/80486SX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set Unidentified
Max. Onboard 32/128MB (depends on board revision)
DRAM
Cache 128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+------------+-------------------+-----------|
| Power LED & | JP6 pins 1 | Reset switch | JP6 pins |
| keylock | - 5 | | 19 - 20 |
|---------------+------------+-------------------+-----------|
| Speaker | JP6 pins 6 | External battery | JP17 |
| | - 9 | | |
|---------------+------------+-------------------+-----------|
| Turbo LED | JP6 pins | Auxiliary | JP35 |
| | 11 - 12 | keyboard | |
| | | connector | |
|---------------+------------+-------------------+-----------|
| Turbo switch | JP6 pins | 32-bit VESA local | SL1 & SL2 |
| | 16 - 17 | bus slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | PQFP CPU disabled | JP1 | Closed |
|---+----------------------------------+--------+------------|
| | PQFP CPU enabled | JP1 | Open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Battery type select 4.5v | JP34 | Closed |
|---+----------------------------------+--------+------------|
| | Battery type select 6.0v | JP34 | Open |
|---+----------------------------------+--------+------------|
| » | CPU speed select 20/25MHz | JP72 | Closed |
|---+----------------------------------+--------+------------|
| | CPU speed select => 33MHz | JP72 | Open |
|---+----------------------------------+--------+------------|
| » | VESA card select normal | JP89 | Closed |
|---+----------------------------------+--------+------------|
| | VESA card select Weitek VESA | JP89 | Open |
| | card only | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (REV. 0) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (REV. A) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Revision | JP76 | JP77 | JP90 | JP91 | JP92 | JP93 |
|----------+-------+-------+--------+--------+--------+------|
| Rev. 0 | 1 & 2 | 2 & 3 | Open | Open | Open | 2 & |
| | | | | | | 3 |
|----------+-------+-------+--------+--------+--------+------|
| Rev. A | 2 & 3 | 1 & 2 | Closed | Closed | Closed | 1 & |
| | | | | | | 2, 3 |
| | | | | | | & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | JP7 | JP8 |
|------------------+--------------------+--------------------|
| 128KB | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 256KB | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP2 | JP3 | JP4 | JP5 | JP9 |
|----------------+----------+-------+--------+-------+-------|
| CX486SX | 2 & 3 | Open | Open | 2 & 4 | 2 & 3 |
|----------------+----------+-------+--------+-------+-------|
| 80486SX (PQFP) | Open | Open | Open | 3 & 5 | 2 & 3 |
|----------------+----------+-------+--------+-------+-------|
| 80486SX (PGA) | 2 & 3 | Open | Open | 2 & 3 | 2 & 3 |
|----------------+----------+-------+--------+-------+-------|
| 80486DX | 1 & 2, 3 | 2 & 3 | Open | 2 & 3 | 2 & 3 |
| | & 4 | | | | |
|----------------+----------+-------+--------+-------+-------|
| 80486DX2 | 1 & 2, 3 | 2 & 3 | Open | 2 & 3 | 2 & 3 |
| | & 4 | | | | |
|----------------+----------+-------+--------+-------+-------|
| Pentium | 1 & 2, 3 | 1 & 2 | Closed | 2 & 3 | 2 & 3 |
| Overdrive | & 4 | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP33 | JP36 |
|------------+--------------------+--------------------------|
| 25MHz | pins 2 & 3 closed | pins 2 & 6, 4 & 8 closed |
|------------+--------------------+--------------------------|
| 33MHz | pins 2 & 3 closed | pins 3 & 7, 4 & 8 closed |
|------------+--------------------+--------------------------|
| 40MHz | pins 2 & 3 closed | pins 2 & 6 closed |
|------------+--------------------+--------------------------|
| 50iMHz | pins 2 & 3 closed | pins 2 & 6, 4 & 8 closed |
|------------+--------------------+--------------------------|
| 50MHz | pins 1 & 2 closed | pins 3 & 7 closed |
|------------+--------------------+--------------------------|
| 66iMHz | pins 2 & 3 closed | pins 3 & 7, 4 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | ID2 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | ID3 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PAL JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Revision | JP96 | TP1 | TP2 | TP3 | TP4 |
|-----------+----------+---------+---------+--------+--------|
| Rev. 0 | Open | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|-----------+----------+---------+---------+--------+--------|
| Rev. A | Closed | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BOARD REVISION JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Revision | JP78 | JP79 | JP97 | JP98 |
|----------+------------+------------+-----------+-----------|
| Rev. 0 | pins 1 & 2 | pins 1 & 2 | pins 1 & | pins 1 & |
| | closed | closed | 2 closed | 2 closed |
|----------+------------+------------+-----------+-----------|
| Rev. A | pins 2 & 3 | pins 2 & 3 | pins 2 & | pins 2 & |
| | closed | closed | 3 closed | 3 closed |
|------------------------------------------------------------|
| Note: These jumpers configure the board revision. |
+------------------------------------------------------------+