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# ACER, INC.
AP55CS
Device Type Mainboard
Processor CX 6X86/Pentium
Processor Speed 75/90/100/120/133/150/166MHz
Chip Set SIS
Video Chip Set Unidentified
Maximum Onboard 128MB (EDO supported) Unified Memory
Memory Architecture (UMA)
Cache 256KB
BIOS AMI
Dimensions 280mm x 220mm
I/O Options 32-bit PCI slots (3), floppy drive interface,
IDE interfaces (2), parallel port, serial
ports (2), VGA feature connector, VGA port,
VRM connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+----------------+-------------|
| Serial port 1 | CN1 | IDE interface | JP16 |
| | | LED | |
|------------------+----------+----------------+-------------|
| Serial port 2 | CN2 | Power LED & | JP24/pins 1 |
| | | keylock | – 5 |
|------------------+----------+----------------+-------------|
| Floppy drive | CN3 | Speaker | JP24/pins 7 |
| interface | | | – 10 |
|------------------+----------+----------------+-------------|
| Parallel port | CN4 | Turbo LED | JP24/pins |
| | | | 12 & 13 |
|------------------+----------+----------------+-------------|
| IDE interface 2 | CN5 | Turbo switch | JP24/pins |
| | | | 15 – 17 |
|------------------+----------+----------------+-------------|
| IDE interface 1 | CN6 | Reset switch | JP24/pins |
| | | | 19 & 20 |
|------------------+----------+----------------+-------------|
| VGA feature | CN7 | 32-bit PCI | PC1 – PC3 |
| connector | | slots | |
|------------------+----------+----------------+-------------|
| VGA port | J3 | VRM connector | VRM |
|------------------+----------+----------------+-------------|
| CPU fan power | J7 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | JP2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP3 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP5 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP8 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP13 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | On board I/O enabled | JP14 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | On board I/O disabled | JP14 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP17 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP19 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP19 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 512K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K 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 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K 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 |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 256KB | (2) 32K x 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 |
|-----------------------------+------------------------------|
| Linear mode | Pins 1 & 2 closed |
|-----------------------------+------------------------------|
| Interleave mode | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP9 | JP10 | JP22 | JP23 |
| speed | speed | | | | | |
|--------+--------+------------+-------+-------+------+------|
| 120MHz | 50MHz | 2x | 2 & 3 | 2 & 3 | Open | Open |
|--------+--------+------------+-------+-------+------+------|
| 150MHz | 60MHz | 2x | 2 & 3 | 1 & 2 | Open | Open |
|--------+--------+------------+-------+-------+------+------|
| 166MHz | 66MHz | 2x | 1 & 2 | 2 & 3 | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP9 | JP10 | JP22 | JP23 |
| speed | speed | | | | | |
|--------+--------+------------+------+-------+-------+------|
| 75MHz | 50MHz | 1.5x | 2 & | 2 & 3 | 2 & 3 | 2 & |
| | | | 3 | | | 3 |
|--------+--------+------------+------+-------+-------+------|
| 90MHz | 60MHz | 1.5x | 2 & | 1 & 2 | 2 & 3 | 2 & |
| | | | 3 | | | 3 |
|--------+--------+------------+------+-------+-------+------|
| 100MHz | 66MHz | 1.5x | 1 & | 2 & 3 | 2 & 3 | 2 & |
| | | | 2 | | | 3 |
|--------+--------+------------+------+-------+-------+------|
| 120MHz | 60MHz | 2x | 2 & | 1 & 2 | 1 & 2 | 2 & |
| | | | 3 | | | 3 |
|--------+--------+------------+------+-------+-------+------|
| 133MHz | 66MHz | 2x | 1 & | 2 & 3 | 1 & 2 | 2 & |
| | | | 2 | | | 3 |
|--------+--------+------------+------+-------+-------+------|
| 150MHz | 60MHz | 2.5x | 2 & | 1 & 2 | 1 & 2 | 1 & |
| | | | 3 | | | 2 |
|--------+--------+------------+------+-------+-------+------|
| 166MHz | 66MHz | 2.5x | 1 & | 2 & 3 | 1 & 2 | 1 & |
| | | | 2 | | | 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECTION |
|------------------------------------------------------------|
| Channel | JP11 | JP12 |
|------------------+--------------------+--------------------|
| 1 | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 3 | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ON BOARD VIDEO SELECTION |
|------------------------------------------------------------|
| Setting | JP4 | JP6 | JP7 |
|-----------+--------+-------------------+-------------------|
| Enabled | Closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
|-----------+--------+-------------------+-------------------|
| Disabled | Open | Pins 2 & 3 closed | Pins 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH BIOS SELECTION |
|------------------------------------------------------------|
| Setting | JP18 |
|----------------------------+-------------------------------|
| 5v | Pins 2 & 3, 5 & 6 closed |
|----------------------------+-------------------------------|
| 12v | Pins 1 & 2, 5 & 6 closed |
|----------------------------+-------------------------------|
| EEPROM | Pins 2 & 3, 4 & 5 closed |
+------------------------------------------------------------+