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# ACER, INC.
AP53
Processor Pentium
Processor Speed 75/90/100/120/133/150/166MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 512MB
Memory
Maximum Video None
Memory
Cache 256KB
BIOS AMI
Dimensions 250mm 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)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+------------------+-------------|
| Serial port 2 | CN1 | Speaker | CN8 pins 7 |
| | | | - 10 |
|----------------+----------+------------------+-------------|
| Serial port 1 | CN2 | Turbo/green PC | CN8 pins 12 |
| | | LED | & 13 |
|----------------+----------+------------------+-------------|
| Parallel port | CN3 | Turbo | CN8 pins 15 |
| | | switch/green PC | - 17 |
| | | connector | |
|----------------+----------+------------------+-------------|
| Floppy drive | CN4 | Reset switch | CN8 pins 19 |
| interface | | | & 20 |
|----------------+----------+------------------+-------------|
| IDE interface | CN5 | Chassis fan | CN9 |
| 2 | | power | |
|----------------+----------+------------------+-------------|
| IDE interface | CN6 | IDE interface | CN12 |
| 1 | | LED | |
|----------------+----------+------------------+-------------|
| PS/2 mouse | CN7 | 32-bit PCI slots | PC1 - PC4 |
| interface | | | |
|----------------+----------+------------------+-------------|
| Power LED & | CN8 pins | | |
| keylock | 1 - 5 | | |
|------------------------------------------------------------|
| Note: If connector for CN8 is 12-pin, connect red wire to |
| pin 11. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------------+--------+------------|
| » | PS/2 mouse IRQ12 enabled | JP4 | Closed |
|---+----------------------------------+--------+------------|
| | PS/2 mouse IRQ12 disabled | JP4 | Open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP5 | Pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP5 | Pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | On board I/O controller enabled | JP8 | Pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board I/O controller disabled | JP8 | Pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Keyboard clock select ISA clock | JP1401 | Pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Keyboard clock select 12MHz | JP1401 | Pins 3 & 4 |
| | clock | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K 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 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M 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 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M 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 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | None |
|------------------+--------------------+--------------------|
| 136MB | (2) 1M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 144MB | (2) 2M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 160MB | (2) 4M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 256MB | (2) 16M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 256MB | (2) 32M x 36 | None |
|------------------+--------------------+--------------------|
| 264MB | (2) 1M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 272MB | (2) 2M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 288MB | (2) 4M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 320MB | (2) 8M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 384MB | (2) 16M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 512MB | (2) 32M x 36 | (2) 32M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 256KB | (2) 32K x 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP1 | JP10 |
|--------+-------------------------+-------------------------|
| 75MHz | Pins 1 & 2, 3 & 4 | Pins 1 & 2, 3 & 4 |
| | closed | closed |
|--------+-------------------------+-------------------------|
| 90MHz | Pins 1 & 2 closed | Pins 1 & 2, 3 & 4 |
| | | closed |
|--------+-------------------------+-------------------------|
| 100MHz | Pins 3 & 4 closed | Pins 1 & 2, 3 & 4 |
| | | closed |
|--------+-------------------------+-------------------------|
| 120MHz | Pins 1 & 2 closed | Pins 3 & 4, 5 & 6 |
| | | closed |
|--------+-------------------------+-------------------------|
| 133MHz | Pins 3 & 4 closed | Pins 3 & 4, 5 & 6 |
| | | closed |
|--------+-------------------------+-------------------------|
| 150MHz | Pins 1 & 2 closed | Pins 5 & 6, 7 & 8 |
| | | closed |
|--------+-------------------------+-------------------------|
| 166MHz | Pins 3 & 4 closed | Pins 5 & 6, 7 & 8 |
| | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP11 |
|----------------------------+-------------------------------|
| 3.45v | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3.52v | Pins 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECTION |
|------------------------------------------------------------|
| Channel | JP6 | JP7 |
|------------------+--------------------+--------------------|
| | 1 | Pins 2 & 3 closed | Pins 2 & 3 closed |
|----+-------------+--------------------+--------------------|
| » | 3 | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH BIOS VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP1301 | JP1302 |
|------------------+--------------------+--------------------|
| » | 5v | Pins 1 & 2 closed | Pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | 12v | Pins 2 & 3 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+