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# ANTEC, INC.
MB557
Processor CX M1/IBM/AM K5/AM K6/Pentium
Processor Speed 75/90/100/120/125/133/150/166/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video 1MB
Memory
Cache 256/512KB
BIOS Award
Dimensions 280mm x 220mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse interface, serial
ports (2), cache slot, IR connector, USB
connectors (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Floppy drive | CN1 | PS/2 mouse | J99 |
| interface | | interface | |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN2 | Chassis fan | JP1 |
| | | power | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN3 | IR connector | JP3 |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | Reset switch | JP12 |
|-------------------+----------+------------------+----------|
| IDE interface 1 | J6 | Green PC | JP15 |
| | | connector | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | J7 | IDE interface | JP22 |
| | | LED | |
|-------------------+----------+------------------+----------|
| USB connector | J10 | Green PC LED | JP33 |
|-------------------+----------+------------------+----------|
| USB connector | J11 | 32-bit PCI slots | PC1 – |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| Speaker | J12 | Cache slot | SL1 |
|-------------------+----------+------------------+----------|
| Power LED & | J14 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+--------+-------------|
| | Monitor type select CGA40/CGA80 | JP7 | Closed |
|---+---------------------------------+--------+-------------|
| | Monitor type select monochrome | JP7 | Open |
|---+---------------------------------+--------+-------------|
| | Monitor type select color | JP7 | Any setting |
|---+---------------------------------+--------+-------------|
| » | Password normal operation | JP9 | Open |
|---+---------------------------------+--------+-------------|
| | Password clear | JP9 | Closed |
|---+---------------------------------+--------+-------------|
| | Flash BIOS voltage select 12v | JP19 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | Flash BIOS voltage select 5v | JP19 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| » | CMOS memory normal operation | JP21 | Open |
|---+---------------------------------+--------+-------------|
| | CMOS memory clear | JP21 | Closed |
|---+---------------------------------+--------+-------------|
| » | Factory configured - do not | JP39 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+--------+-------------|
| » | Factory configured - do not | JP43 | Closed |
| | alter | | |
|---+---------------------------------+--------+-------------|
| » | Factory configured - do not | JP44 | Open |
| | alter | | |
|------------------------------------------------------------|
| Note: If Cyrix 6x86 or AMD K5 processor is installed, JP9 |
| is not available. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|----------------+---------------------+---------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|----------------+---------------------+---------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|----------------+---------------------+---------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|----------------+---------------------+---------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. Banks are interchangeable. |
| Do not install SIMMs & DIMMs at the same time. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 1M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 24MB | (1) 2M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 64 | None |
|------------------+--------------------+--------------------|
| 32MB | (1) 2M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 40MB | (1) 4M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 64MB | (1) 4M x 64 | (1) 4M x 64 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | SL1 |
|--------------+--------------------+------------------------|
| 256KB | (2) 32K x 32 | Not installed |
|--------------+--------------------+------------------------|
| 512KB | (2) 32K x 32 | 256KB module installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP29 | JP30 |
|------------------+--------------------+--------------------|
| 256KB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 512KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP23 | JP24 | JP36 |
| speed | speed | | | | |
|---------+--------+------------+-------+-------+------------|
| 120MHz | 50MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4, 5 & 6 |
|---------+--------+------------+-------+-------+------------|
| 133MHz | 55MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 150MHz | 60MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 166MHz | 66MHz | 2x | 1 & 2 | 2 & 3 | 3 & 4, 5 & |
| | | | | | 6 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP23 | JP24 | JP36 |
| speed | speed | | | | |
|---------+--------+------------+-------+-------+------------|
| 120MHz | 50MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4, 5 & 6 |
|---------+--------+------------+-------+-------+------------|
| 133MHz | 55MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 150MHz | 60MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 166MHz | 66MHz | 2x | 1 & 2 | 2 & 3 | 3 & 4, 5 & |
| | | | | | 6 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP23 | JP24 | JP36 |
| speed | speed | | | | |
|---------+--------+------------+-------+-------+------------|
| 75MHz | 50MHz | 1.5x | 2 & 3 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4, 5 & 6 |
|---------+--------+------------+-------+-------+------------|
| 90MHz | 60MHz | 1.5x | 2 & 3 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 100MHz | 66MHz | 1.5x | 2 & 3 | 2 & 3 | 3 & 4, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 120MHz | 60MHz | 1.5x | 2 & 3 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 133MHz | 66MHz | 1.5x | 2 & 3 | 2 & 3 | 3 & 4, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 150MHz | 60MHz | 1.75x | 1 & 2 | 1 & 2 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 166MHz | 66MHz | 1.75x | 1 & 2 | 1 & 2 | 3 & 4, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 166MHz | 66MHz | 2.5x | 1 & 2 | 1 & 2 | 3 & 4, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 200MHz | 66MHz | 3x | 2 & 3 | 1 & 2 | 3 & 4, 5 & |
| | | | | | 6 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP23 | JP24 | JP36 |
| speed | speed | | | | |
|---------+--------+------------+-------+-------+------------|
| 75MHz | 50MHz | 1.5x | 2 & 3 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4, 5 & 6 |
|---------+--------+------------+-------+-------+------------|
| 90MHz | 60MHz | 1.5x | 2 & 3 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 100MHz | 66MHz | 1.5x | 2 & 3 | 2 & 3 | 3 & 4, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 120MHz | 60MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 125MHz | 50MHz | 2.5x | 1 & 2 | 1 & 2 | 1 & 2, 3 & |
| | | | | | 4, 5 & 6 |
|---------+--------+------------+-------+-------+------------|
| 133MHz | 66MHz | 2x | 1 & 2 | 2 & 3 | 3 & 4, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 150MHz | 60MHz | 2.5x | 1 & 2 | 1 & 2 | 1 & 2, 3 & |
| | | | | | 4 |
|---------+--------+------------+-------+-------+------------|
| 166MHz | 66MHz | 2.5x | 1 & 2 | 1 & 2 | 3 & 4, 5 & |
| | | | | | 6 |
|---------+--------+------------+-------+-------+------------|
| 200MHz | 66MHz | 3x | 2 & 3 | 1 & 2 | 3 & 4, 5 & |
| | | | | | 6 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (SINGLE) |
|------------------------------------------------------------|
| Voltage | J100 | J105 | J107 | J108 |
|-----------+---------------+---------+-------+--------------|
| 2.82v | Open | 3 & 4 | Open | 1 & 3, 2 & 4 |
|-----------+---------------+---------+-------+--------------|
| 2.94v | 2 & 4 | 3 & 4 | Open | 1 & 3, 2 & 4 |
|-----------+---------------+---------+-------+--------------|
| 3.10v | 3 & 4 | 3 & 4 | Open | 1 & 3, 2 & 4 |
|-----------+---------------+---------+-------+--------------|
| 3.33v | 1 & 3 | 3 & 4 | Open | 1 & 3, 2 & 4 |
|-----------+---------------+---------+-------+--------------|
| 3.53v | 1 & 3, 2 & 4 | 3 & 4 | Open | 1 & 3, 2 & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (DUAL) |
|------------------------------------------------------------|
| Voltage | V core | J100 | J105 | J107 | J108 |
|----------+---------+--------+--------+--------------+------|
| 3.33v | 2.82v | Open | 3 & 4 | 1 & 3, 2 & 4 | Open |
|----------+---------+--------+--------+--------------+------|
| 3.33v | 2.94v | 2 & 4 | 3 & 4 | 1 & 3, 2 & 4 | Open |
|----------+---------+--------+--------+--------------+------|
| 3.33v | 3.10v | 3 & 4 | 3 & 4 | 1 & 3, 2 & 4 | Open |
|----------+---------+--------+--------+--------------+------|
| 3.44v | 2.82v | Open | 2 & 4 | 1 & 3, 2 & 4 | Open |
|----------+---------+--------+--------+--------------+------|
| 3.44v | 2.94v | 2 & 4 | 2 & 4 | 1 & 3, 2 & 4 | Open |
|----------+---------+--------+--------+--------------+------|
| 3.44v | 3.10v | 3 & 4 | 2 & 4 | 1 & 3, 2 & 4 | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+