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# ACER, INC.
ACERALTOS 300 (M1A), M1A
Device Type Mainboard
Processor CX M1/AM K5/Pentium
Processor Speed 75/90/100/120/133MHz
Chip Set OPTI
Video Chip Set Unidentified
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video 2MB
Memory
Cache 256KB
BIOS Acer
Dimensions 330mm x 218mm
I/O Options Ethernet 10BaseT connector, floppy drive
interface, green PC connector, IDE interfaces
(2), SCSI interface, parallel port, PS/2
mouse port, serial ports (2), VGA feature
connector, VGA port, riser slot
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+-----------------+-------------|
| VGA port | C1 | SCSI interface | CN10 |
|-----------------+----------+-----------------+-------------|
| Parallel port | C2 | Power LED & | CN11 |
| | | keylock | |
|-----------------+----------+-----------------+-------------|
| Serial port 2 | C3 | Power LED & | CN12/pins 1 |
| | | keylock | – 4 |
|-----------------+----------+-----------------+-------------|
| Serial port 1 | C4 | Reset switch | CN12/pins 6 |
| | | | & 7 |
|-----------------+----------+-----------------+-------------|
| PS/2 mouse port | C5 | IDE interface | CN13 |
| | | LED | |
|-----------------+----------+-----------------+-------------|
| Ethernet | C6 | Speaker | CN14 |
| 10BaseT | | | |
| connector | | | |
|-----------------+----------+-----------------+-------------|
| Chassis fan | C7 | Power LED & | CN15/pins 1 |
| power | | keylock | – 5 |
|-----------------+----------+-----------------+-------------|
| Chassis fan | C8 | Speaker | CN15/pins 7 |
| power | | | – 10 |
|-----------------+----------+-----------------+-------------|
| AUI interface | CN4 | Turbo LED | CN15/pins |
| | | | 12 & 13 |
|-----------------+----------+-----------------+-------------|
| VGA feature | CN5 | Turbo switch | CN15/pins |
| connector | | | 15 – 17 |
|-----------------+----------+-----------------+-------------|
| Floppy drive | CN6 | Reset switch | CN15/pins |
| interface | | | 19 & 20 |
|-----------------+----------+-----------------+-------------|
| IDE interface 2 | CN7 | Riser slot | SL1 |
|-----------------+----------+-----------------+-------------|
| IDE interface 1 | CN8 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | CN16 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | BIOS type select Acer | JP1 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | BIOS type select OEM | JP1 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Password disabled | JP2 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Password enabled | JP2 | Pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM 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 |
|------------------+--------------------+--------------------|
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Type | JP9 | JP14 |
|------------------+--------------------+--------------------|
| » | Normal | Pins 1 & 2 closed | Pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | EDO | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 256KB | None | (8) 32K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (2) 32K x 32 | None | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 (CX M1) |
|------------------------------------------------------------|
| CPU speed | Clock | Multiplier | JP5 | JP8 | JX1 |
| | speed | | | | |
|------------+----------+------------+-------+-------+-------|
| 120MHz | 60MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2 |
|------------+----------+------------+-------+-------+-------|
| 133MHz | 66MHz | 2x | 2 & 3 | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K5) |
|------------------------------------------------------------|
| CPU speed | Clock | Multiplier | JP5 | JP8 | JX1 |
| | speed | | | | |
|------------+----------+------------+-------+-------+-------|
| 75MHz | 50MHz | 1.5x | Open | 1 & 2 | 1 & 2 |
|------------+----------+------------+-------+-------+-------|
| 90MHz | 60MHz | 1.5x | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+----------+------------+-------+-------+-------|
| 100MHz | 66MHz | 1.5x | 2 & 3 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU speed | Clock | Multiplier | JP5 | JP8 | JX1 |
| | speed | | | | |
|------------+----------+------------+-------+-------+-------|
| 75MHz | 50MHz | 1.5x | Open | 1 & 2 | 1 & 2 |
|------------+----------+------------+-------+-------+-------|
| 90MHz | 60MHz | 1.5x | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+----------+------------+-------+-------+-------|
| 100MHz | 66MHz | 1.5x | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+----------+------------+-------+-------+-------|
| 120MHz | 60MHz | 2x | 1 & 2 | 2 & 3 | 1 & 2 |
|------------+----------+------------+-------+-------+-------|
| 133MHz | 66MHz | 2x | 2 & 3 | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP10 | JP11 | JP12 | JP13 |
|-----------+------------+-----------+-----------+-----------|
| AM K5 | Closed | Closed | Open | Closed |
|-----------+------------+-----------+-----------+-----------|
| CX M1 | Open | Open | Open | Open |
|-----------+------------+-----------+-----------+-----------|
| Intel | Closed | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP7 |
|----------------------------+-------------------------------|
| VR | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| VRE | Pins 2 & 3 closed |
+------------------------------------------------------------+