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# ACER, INC.
ACERALTOS 900K (M11C) (IDUN), M11C (IDUN)
Device Type Mainboard
Processor Pentium II
Processor Speed 233/266MHz
Chip Set Intel 440FX
Video Chip Set Unidentified
Maximum Onboard 512MB
Memory
Maximum Video 2MB
Memory
Cache 256/512KB (located on Pentium II CPU)
BIOS Acer
Dimensions 305mm x 244mm
I/O Options 32-bit PCI slots (3), Ethernet 10BaseT
connector, floppy drive interface, IDE
interfaces (2), SCSI-2 interface, Wide SCSI
interface, parallel port, PS/2 mouse port,
serial ports (2), VGA feature connector, VGA
port, USB connectors (2), ATX power connector
IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| ATX power | ATX | SCSI-2 interface | CN18 |
| connector | | | |
|-------------------+----------+------------------+----------|
| 5v power | CN1 | Floppy drive | CN20 |
| | | interface | |
|-------------------+----------+------------------+----------|
| RDM connector | CN3 | Serial port 1 | CN21 |
|-------------------+----------+------------------+----------|
| RDM connector | CN4 | Serial port 2 | CN22 |
|-------------------+----------+------------------+----------|
| USB connector 1 | CN5 | Wide SCSI | CN23 |
| | | interface | |
|-------------------+----------+------------------+----------|
| USB connector 2 | CN5A | IDE interface 1 | CN24 |
|-------------------+----------+------------------+----------|
| 3.3v power | CN6 | IDE interface | CN25 |
| | | LED | |
|-------------------+----------+------------------+----------|
| 420W power | CN7 | Reset, turbo LED | CN26 |
| connector | | keylock | |
|-------------------+----------+------------------+----------|
| 250W power | CN8 | Speaker | CN27 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Chassis intrusion | CN9 | Power LED | CN28 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Thermal sensor | CN10 | IDE interface 2 | CN29 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Soft off power | CN11 | VGA feature | CN30 |
| supply | | connector | |
|-------------------+----------+------------------+----------|
| Ethernet 10BaseT | CN12 | Chassis fan | FA1 |
| connector | | power | |
|-------------------+----------+------------------+----------|
| Parallel port | CN13 | Chassis fan | FA2 |
| | | power | |
|-------------------+----------+------------------+----------|
| VGA port | CN13A | Chassis fan | FA3 |
| | | power | |
|-------------------+----------+------------------+----------|
| Redundant power | CN14 | Chassis fan | FA4 |
| supply connector | | power | |
|-------------------+----------+------------------+----------|
| LED connector | CN15 | 32-bit PCI slots | PC1 - |
| | | | PC3 |
|-------------------+----------+------------------+----------|
| PS/2 mouse port | CN17 | | |
|------------------------------------------------------------|
| Note: The location of ATX is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | 420W enabled | JP1 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | 420W disabled | JP1 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP3 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | BIOS type select Acer | JP4 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | BIOS type select OEM | JP4 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Password disabled | JP5 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Password enabled | JP5 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Termination enabled | JP6 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Termination switchable through | JP6 | Pins 2 & 3 |
| | SCSI select utility | | closed |
|---+---------------------------------+-------+--------------|
| » | On board video enabled | JP7 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | On board video disabled | JP7 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Buzzer enabled | JP8 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Buzzer disabled | JP8 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Software power down enabled | JP9 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | General power supply enabled | JP9 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Flash BIOS write protect | JP12 | Pins 1 & 2 |
| | enabled | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS write protect | JP12 | Pins 2 & 3 |
| | disabled | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 2M x 64 | None | None | None |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 2M x 64 | (1) 2M x | None | None |
| | | 64 | | |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 2M x 64 | (1) 2M x | (1) 2M x | None |
| | | 64 | 64 | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 2M x 64 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 64 | 64 | 64 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 4M x 64 | None | None | None |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 64 | (1) 4M x | None | None |
| | | 64 | | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 64 | (1) 4M x | (1) 4M x | None |
| | | 64 | 64 | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 4M x 64 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 64 | 64 | 64 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 64 | None | None | None |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 64 | (1) 8M x | None | None |
| | | 64 | | |
|-------+-------------+------------+------------+------------|
| 192MB | (1) 8M x 64 | (1) 8M x | (1) 8M x | None |
| | | 64 | 64 | |
|-------+-------------+------------+------------+------------|
| 256MB | (1) 8M x 64 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 64 | 64 | 64 |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 16M x | None | None | None |
| | 64 | | | |
|-------+-------------+------------+------------+------------|
| 256MB | (1) 16M x | (1) 16M x | None | None |
| | 64 | 64 | | |
|-------+-------------+------------+------------+------------|
| 384MB | (1) 16M x | (1) 16M x | (1) 16M x | None |
| | 64 | 64 | 64 | |
|-------+-------------+------------+------------+------------|
| 512MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 16M x |
| | 64 | 64 | 64 | 64 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: 256KB/512KB cache is located on the Pentium II CPU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (2) 256K x 16 | None |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 16 | (2) 256K x 16 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP2 |
|-----------+-------------+------------+---------------------|
| 233MHz | 66MHz | 3.5x | Pins 1 & 2, 4 & 5 |
| | | | closed |
|-----------+-------------+------------+---------------------|
| 266MHz | 66MHz | 4x | Pins 1 & 2, 4 & 5 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH BIOS SELECTION |
|------------------------------------------------------------|
| Setting | JP11 |
|----------------------------------+-------------------------|
| » | Controlled by software | Pins 1 & 2 closed |
|---+------------------------------+-------------------------|
| | 5v | Open |
|---+------------------------------+-------------------------|
| | 12v | Pins 2 & 3 closed |
+------------------------------------------------------------+
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