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# MECER CORPORATION
B880
Processor SL80486SX/80486SX/CX486DX/SL80486DX/80486DX/SL80486DX2/
80486DX2/P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set Contaq
Max. 128MB
Onboard
DRAM
Cache 128/256/512/1024KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O 32-bit VESA local bus slots (2), 32-bit PCI slots (3),
Options green PC connector
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+-----------+---------------+-----------|
| Auxiliary keyboard | JP1 | Turbo LED | JP59 pins |
| connector | | | 11 - 12 |
|--------------------+-----------+---------------+-----------|
| External battery | JP3 | Green PC LED | JP59 pins |
| | | | 13 - 14 |
|--------------------+-----------+---------------+-----------|
| External battery | JP4 | Turbo switch | JP59 pins |
| | | | 16 - 17 |
|--------------------+-----------+---------------+-----------|
| Green PC connector | JP6 | Reset switch | JP59 pins |
| | | | 19 - 20 |
|--------------------+-----------+---------------+-----------|
| Power LED & | JP59 pins | 32-bit PCI | PC1 - PC3 |
| keylock | 1 - 4 | slots | |
|--------------------+-----------+---------------+-----------|
| Speaker | JP59 pins | 32-bit VESA | SL1 & SL2 |
| | 7 - 10 | local bus | |
| | | slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+--------+-------------|
| » | CMOS memory normal operation | JP2 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | CMOS memory clear | JP2 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| » | PQFP CPU disabled | JP33 | Closed |
|---+---------------------------------+--------+-------------|
| | PQFP CPU enabled | JP33 | Open |
|---+---------------------------------+--------+-------------|
| » | PCI clock delay select 1 delay | JP43 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | PCI clock delay select 3 delays | JP43 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 2MB | (1) 256K x 36 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 5MB | (1) 1M x 36 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 17MB | (1) 4M x 36 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 65MB | (4) 256K x 9 | (1) 16M x 36 |
|------------------+--------------------+--------------------|
| 65MB | (1) 16M x 36 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 68MB | (4) 1M x 9 | (1) 16M x 36 |
|------------------+--------------------+--------------------|
| 68MB | (1) 16M x 36 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 80MB | (4) 4M x 9 | (1) 16M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (1) 16M x 36 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (1) 16M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (1) 16M x 36 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Type | JP10 | JP11 |
|--------------------+-------------------+-------------------|
| Bank 0 = 30-pin & | pins 1 & 2 closed | pins 2 & 3 closed |
| Bank 1 = 72-pin | | |
|--------------------+-------------------+-------------------|
| Bank 0 = 72-pin & | pins 2 & 3 closed | pins 1 & 2 closed |
| Bank 1 = 30-pin | | |
|--------------------+-------------------+-------------------|
| Bank 0/1 = double | Open | pins 1 & 2, 3 & 4 |
| side 72-pin | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 64K x 8 | NONE | (1) 64K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 128K x 8 | (4) 128K x 8 | (1) 128K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP49 | JP50 | JP51 |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 2 & 3 | Open |
| | closed | closed | |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | Open |
| | closed | closed | |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 2 & 3 | Open |
| | closed | closed | |
|-------+-----------------+-----------------+----------------|
| 512KB | pins 2 & 3 | Open | pins 1 & 2 |
| | closed | | closed |
|-------+-----------------+-----------------+----------------|
| 512KB | pins 2 & 3 | pins 2 & 3 | Open |
| | closed | closed | |
|-------+-----------------+-----------------+----------------|
| 1MB | pins 2 & 3 | Open | pins 2 & 3 |
| | closed | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP35 | JP36 | JP41 | JP52 |
|----------------------+--------+--------+--------+----------|
| 80486SX | 1 & 2 | Open | 1 & 2 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| SL80486SX | 2 & 3 | Open | 1 & 2 | 2 & 3 |
|----------------------+--------+--------+--------+----------|
| CX486DX | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| 80486DX | 2 & 3 | Open | 1 & 2 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| SL80486DX | 2 & 3 | Open | 1 & 2 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| 80486DX2 | 1 & 2 | Open | 1 & 2 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| SL80486DX2 | 2 & 3 | Open | 1 & 2 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| P24D (WB) | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| P24D (WT) | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2, 3 |
| | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| Pentium Overdrive | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2, 3 |
| (WB) | | | | & 4 |
|----------------------+--------+--------+--------+----------|
| Pentium Overdrive | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2, 3 |
| (WT) | | | | & 4 |
|------------------------------------------------------------|
| Note: WB = write back & WT = write through. Pins |
| designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP53 | JP55 | JP56 | JP57 |
|------------------+----------+--------+----------+----------|
| 80486SX | Open | Open | Open | Open |
|------------------+----------+--------+----------+----------|
| SL80486SX | 1 & 2 | Open | 3 & 4, 5 | Open |
| | | | & 6 | |
|------------------+----------+--------+----------+----------|
| CX486DX | 2 & 3 | 2 & 3 | 4 & 5 | 5 & 6 |
|------------------+----------+--------+----------+----------|
| 80486DX | Open | 2 & 3 | Open | Open |
|------------------+----------+--------+----------+----------|
| SL80486DX | 1 & 2 | 2 & 3 | 3 & 4, 5 | Open |
| | | | & 6 | |
|------------------+----------+--------+----------+----------|
| 80486DX2 | Open | 2 & 3 | Open | Open |
|------------------+----------+--------+----------+----------|
| SL80486DX2 | 1 & 2 | 2 & 3 | 3 & 4, 5 | Open |
| | | | & 6 | |
|------------------+----------+--------+----------+----------|
| P24D (WB) | 1 & 2, 3 | 2 & 3 | 3 & 4, 5 | 2 & 3, 4 |
| | & 4 | | & 6 | & 5 |
|------------------+----------+--------+----------+----------|
| P24D (WT) | 1 & 2, 3 | 2 & 3 | 3 & 4, 5 | 1 & 2, 4 |
| | & 4 | | & 6 | & 5 |
|------------------+----------+--------+----------+----------|
| Pentium | 1 & 2 | 1 & 2 | 5 & 6 | 3 & 4 |
| Overdrive (WB) | | | | |
|------------------+----------+--------+----------+----------|
| Pentium | 1 & 2 | 1 & 2 | 5 & 6 | 1 & 2 |
| Overdrive (WT) | | | | |
|------------------------------------------------------------|
| Note: WB = write back & WT = write through. Pins |
| designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP17 | JP22 | JP39 | JP40 | JP47 |
|----------+----------+----------+---------+--------+--------|
| 25MHz | Closed | Closed | 1 & 2 | 2 & 3 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 33MHz | Closed | Open | 2 & 3 | 1 & 2 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 40MHz | Open | Open | 1 & 2 | 2 & 3 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 50iMHz | Closed | Closed | 1 & 2 | 2 & 3 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 50MHz | Open | Open | 2 & 3 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 66iMHz | Closed | Open | 2 & 3 | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP60 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP61 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ3) |
|------------------------------------------------------------|
| IRQ | JP10A |
|-------------------------------+----------------------------|
| IRQ3 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ3 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ4) |
|------------------------------------------------------------|
| IRQ | JP10B |
|-------------------------------+----------------------------|
| IRQ4 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ4 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ5) |
|------------------------------------------------------------|
| IRQ | JP10C |
|-------------------------------+----------------------------|
| IRQ5 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ5 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ7) |
|------------------------------------------------------------|
| IRQ | JP10D |
|-------------------------------+----------------------------|
| IRQ7 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ7 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ10) |
|------------------------------------------------------------|
| IRQ | JP10E |
|-------------------------------+----------------------------|
| IRQ10 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ10 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ11) |
|------------------------------------------------------------|
| IRQ | JP10F |
|-------------------------------+----------------------------|
| IRQ11 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ11 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ12) |
|------------------------------------------------------------|
| IRQ | JP10G |
|-------------------------------+----------------------------|
| IRQ12 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ12 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ15) |
|------------------------------------------------------------|
| IRQ | JP10H |
|-------------------------------+----------------------------|
| IRQ15 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ15 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ9) |
|------------------------------------------------------------|
| IRQ | JP10I |
|-------------------------------+----------------------------|
| IRQ9 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ9 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ6) |
|------------------------------------------------------------|
| IRQ | JP10J |
|-------------------------------+----------------------------|
| IRQ6 PCI compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| IRQ6 PCI non compliant | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION (IRQ14) |
|------------------------------------------------------------|
| IRQ | JP10K |
|----------------------------------------+-------------------|
| IRQ14 PCI compliant | pins 1 & 2 closed |
|----------------------------------------+-------------------|
| IRQ14 PCI non compliant (1 card | pins 2 & 3 closed |
| installed) | |
|----------------------------------------+-------------------|
| IRQ14 PCI non compliant (2 cards | pins 2 & 4 closed |
| installed) | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI COMPLIANCE CONFIGURATION |
|------------------------------------------------------------|
| Slot | JP7 |
|-------------------------------+----------------------------|
| Slot 1 compliant | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| Slot 1 non-compliant | pins 2 & 3 closed |
|-------------------------------+----------------------------|
| Slot 2 compliant | pins 4 & 5 closed |
|-------------------------------+----------------------------|
| Slot 2 non-compliant | pins 5 & 6 closed |
|-------------------------------+----------------------------|
| Slot 3 compliant | pins 7 & 8 closed |
|-------------------------------+----------------------------|
| Slot 3 non-compliant | pins 8 & 9 closed |
|-------------------------------+----------------------------|
| Slot 3 non-compliant * | pins 11 & 12 closed |
|------------------------------------------------------------|
| Note: * Slot 3 has a second non-compliant PCI card |
| installed. |
+------------------------------------------------------------+