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# M TECHNOLOGY, INC.
R525 PENTIUM PCI
Processor Pentium
Processor 75/90/100/120/133/150MHz
Speed
Chip Set Intel
Max. Onboard 128MB
DRAM
Cache 256/512KB
BIOS Award
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2), parallel
port, PS/2 mouse port, serial ports (2), VRM
connector, cache slot
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| PS/2 mouse port | CN1 | Speaker | J2 |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN2 | Turbo switch | J3 |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN3 | Turbo LED | J4 |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | Reset switch | J5 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN5 | Green PC | J6 |
| interface | | connector | |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN6 | IDE interface | JP35 |
| | | LED | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN7 | 32-bit PCI slots | PC1 - |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| VRM connector | CN8 | Cache slot | SL1 |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| » | Factory configured - do not | JP8 | N/A |
| | alter | | |
|----+---------------------------------+---------+-----------|
| » | Factory configured - do not | JP9 | N/A |
| | alter | | |
|----+---------------------------------+---------+-----------|
| » | Factory configured - do not | JP10 | N/A |
| | alter | | |
|----+---------------------------------+---------+-----------|
| » | Factory configured - do not | JP11 | N/A |
| | alter | | |
|----+---------------------------------+---------+-----------|
| | Pipeline disabled | JP42 | Open |
|----+---------------------------------+---------+-----------|
| | Pipeline enabled | JP42 | Closed |
|----+---------------------------------+---------+-----------|
| » | Cache type select write back | JP43 | Open |
|----+---------------------------------+---------+-----------|
| | Cache type select write through | JP43 | Closed |
|----+---------------------------------+---------+-----------|
| » | Factory configured - do not | JP48 | N/A |
| | alter | | |
|----+---------------------------------+---------+-----------|
| » | Factory configured - do not | JP49 | N/A |
| | alter | | |
|----+---------------------------------+---------+-----------|
| » | CMOS memory normal operation | JP54 | Open |
|----+---------------------------------+---------+-----------|
| | CMOS memory clear | JP54 | Closed |
|------------------------------------------------------------|
| Note: The location of the factory configured jumpers are |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 256K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 512K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 256K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 1M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 256K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 66MB | (2) 256K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG | SL1 |
|-----------+-------------+------------------+---------------|
| 256KB (A) | (8) 32K x 8 | (1) 8K/16K/32K x | Not installed |
| | | 8 | |
|-----------+-------------+------------------+---------------|
| 256KB (B) | NONE | NONE | Installed |
|-----------+-------------+------------------+---------------|
| 512KB (A) | (8) 64K x 8 | (1) 16K/32K x 8 | Not installed |
|-----------+-------------+------------------+---------------|
| 512KB (B) | NONE | NONE | Installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP36 | JP37 |
|---------+------------------+----------------+--------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|---------+------------------+----------------+--------------|
| 512KB | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|------------------------------------------------------------|
| Note: These settings are only valid if standard cache is |
| installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP38 |
|-------------------------------+----------------------------|
| Standard cache | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| Pipeline burst cache | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP3 | JP4 |
|------------------+--------------------+--------------------|
| Mixed voltage | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 3.3v | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | CN8 | JP32 |
|------------------+--------------------+--------------------|
| P54CX | pins A6 & A7, B6 & | Open |
| | B7 closed | |
|------------------+--------------------+--------------------|
| P55C 2.5v | Open | pins 1 & 2, 3 & 4, |
| | | 5 & 6 closed |
|------------------+--------------------+--------------------|
| P55C 2.5v on VRM | VRM installed | Open |
|------------------+--------------------+--------------------|
| P55CT | VRM installed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP28 | JP29 | JP31 | JP40 | JP41 |
|----------+----------+----------+---------+--------+--------|
| 75MHz | Open | Open | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 90MHz | Open | Closed | 2 & 3 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 100MHz | Closed | Closed | 2 & 3 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 120MHz | Open | Closed | 2 & 3 | 1 & 2 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 133MHz | Closed | Closed | 2 & 3 | 1 & 2 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 150MHz | Open | Closed | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP44 | JP45 | JP46 |
|---------------+---------------+---------------+------------|
| 3.3v | Closed | Open | Open |
|---------------+---------------+---------------+------------|
| 3.45v - 3.6v | Open | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CONFIGURATION |
|------------------------------------------------------------|
| » DMA | JP6 | JP7 |
|------------------+--------------------+--------------------|
| » | DMA 1 | pins 2 & 3 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| » | DMA 3 | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PS/2 MOUSE CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP19 | JP20 | JP21 | JP22 | JP23 |
|------------+---------+---------+---------+--------+--------|
| Disabled | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------+---------+---------+---------+--------+--------|
| Enabled | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH BIOS CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP50 | JP51 |
|-------------------+--------------------+-------------------|
| Normal mode | pins 2 & 3 closed | pins 2 & 3 closed |
|-------------------+--------------------+-------------------|
| Programming mode | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note: The location of some pin 1’s are unidentified. |
+------------------------------------------------------------+