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# APRICOT COMPUTERS LIMITED
XEN-PC/PCM
Processor CX486M6/CX486CXM6
&C6/80486SX/CX486M7/80486DX/80486DX2/Pentium
Overdrive/Pentium
Processor 25/33/40/50(internal)/60/66(internal)/66MHz
Speed
Chip Set ALI/Intel/VLSI
Max. Onboard 128MB
DRAM
Cache 64/128/256/512KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options 32-bit PCI local bus slot (on riser card), floppy
drive interface, IDE interface, parallel port,
PS/2 mouse port, serial ports (2), VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| VGA port | CN1 | PS/2 mouse port | CN5 |
|---------------+----------+----------------------+----------|
| Parallel port | CN2 | Floppy drive | CN6 |
| | | interface | |
|---------------+----------+----------------------+----------|
| Serial port 1 | CN3 | IDE interface | CN7 |
|---------------+----------+----------------------+----------|
| Serial port 2 | CN4 | Riser Card | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J10 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | BIOS type select original | JP1 | Open |
|---+----------------------------------+--------+------------|
| | BIOS type select OEM | JP1 | Closed |
|---+----------------------------------+--------+------------|
| » | Security enabled | JP2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Security disabled | JP2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | BIOS type select Flash | JP4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | BIOS type select EPROM | JP4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Floppy drive select normal | JP5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Floppy drive select 3 mode | JP5 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | IDE I/O address select 03xH | JP6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | IDE I/O address select 0BxH | JP6 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | On board video disabled | JP14 | Open |
|---+----------------------------------+--------+------------|
| | On board video enabled | JP14 | Closed |
|---+----------------------------------+--------+------------|
| » | IDE interface enabled | JP16 | Open |
|---+----------------------------------+--------+------------|
| | IDE interface disabled | JP16 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP19 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Key select locked | JP22 | Open |
|---+----------------------------------+--------+------------|
| | Key select unlocked | JP22 | Closed |
|---+----------------------------------+--------+------------|
| » | On board memory enabled | JP28 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board memory disabled | JP28 | pins 2 & 3 |
| | | | closed |
|------------------------------------------------------------|
| Note: The location of JP2 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (NON PENTIUM) |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 |
|------------------+--------------------+--------------------|
| 4MB | NONE | NONE |
|------------------+--------------------+--------------------|
| 8MB | NONE | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 12MB | NONE | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 1M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 20MB | NONE | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 24MB | (1) 1M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 28MB | (1) 4M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (1) 4M x 36 | (1) 4M x 36 |
|------------------------------------------------------------|
| Note: Bank 0 contains 4MB & is factory installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (PENTIUM) |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 |
|--------------+------------------------+--------------------|
| 8MB | NONE | NONE |
|--------------+------------------------+--------------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 |
|--------------+------------------------+--------------------|
| 16MB | (1) 2M x 36 | NONE |
|--------------+------------------------+--------------------|
| 20MB | (1) 1M x 36 | (1) 2M x 36 |
|--------------+------------------------+--------------------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 |
|--------------+------------------------+--------------------|
| 24MB | (1) 4M x 36 | NONE |
|--------------+------------------------+--------------------|
| 28MB | (1) 1M x 36 | (1) 4M x 36 |
|--------------+------------------------+--------------------|
| 32MB | (1) 2M x 36 | (1) 4M x 36 |
|--------------+------------------------+--------------------|
| 40MB | (1) 4M x 36 | (1) 4M x 36 |
|--------------+------------------------+--------------------|
| 40MB | (1) 8M x 36 | NONE |
|--------------+------------------------+--------------------|
| 44MB | (1) 1M x 36 | (1) 8M x 36 |
|--------------+------------------------+--------------------|
| 48MB | (1) 2M x 36 | (1) 8M x 36 |
|--------------+------------------------+--------------------|
| 56MB | (1) 4M x 36 | (1) 8M x 36 |
|--------------+------------------------+--------------------|
| 72MB | (1) 8M x 36 | (1) 8M x 36 |
|--------------+------------------------+--------------------|
| 72MB | (1) 16M x 36 | NONE |
|--------------+------------------------+--------------------|
| 76MB | (1) 1M x 36 | (1) 16M x 36 |
|--------------+------------------------+--------------------|
| 80MB | (1) 2M x 36 | (1) 16M x 36 |
|--------------+------------------------+--------------------|
| 88MB | (1) 4M x 36 | (1) 16M x 36 |
|--------------+------------------------+--------------------|
| 104MB | (1) 8M x 36 | (1) 16M x 36 |
|--------------+------------------------+--------------------|
| 128MB | (1) 16M x 36 | (1) 16M x 36 |
|------------------------------------------------------------|
| Note: Bank 0 contains 8MB & is factory installed. When |
| 128MB is installed, the on board memory is disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: The location and bank configuration of cache is |
| unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP24 | JP25 | JP26 |
|------------+-------------+-----------+---------------------|
| 64KB | Open | Open | pins 1 & 2 closed |
|------------+-------------+-----------+---------------------|
| 128KB | Open | Closed | pins 2 & 3 closed |
|------------+-------------+-----------+---------------------|
| 256KB | Closed | Closed | pins 1 & 2 closed |
|------------------------------------------------------------|
| Note: The jumper settings for 512KB cache is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP11 | JP12 | JP13 | JP15 | JP18 | JP20 | JP27 |
|---------+------+------+------+------+------+------+--------|
| CX486M6 | 2 & | 1 & | 2 & | 2 & | 2 & | 1 & | Open |
| | 3 | 2 | 3 | 3 | 3 | 2 | |
|---------+------+------+------+------+------+------+--------|
| CX486M7 | 2 & | 1 & | 1 & | 2 & | 2 & | 2 & | Open |
| | 3 | 2 | 2 | 3 | 3 | 3 | |
|---------+------+------+------+------+------+------+--------|
| CXM6 & | 2 & | 1 & | 2 & | 2 & | 2 & | 1 & | Open |
| C6 | 3 | 2 | 3 | 3 | 3 | 2 | |
|---------+------+------+------+------+------+------+--------|
| 80486 | 1 & | 1 & | 1 & | 1 & | 2 & | 2 & | Open |
| | 2 | 2 | 2 | 2 | 3 | 3 | |
|---------+------+------+------+------+------+------+--------|
| P24T | 1 & | 2 & | 1 & | 2 & | 1 & | 2 & | Closed |
| | 2 | 3 | 2 | 3 | 2 | 3 | |
|------------------------------------------------------------|
| Note: The jumper settings for the Pentium processor are |
| unknown. Pins designated should be in the closed position. |
| The location of JP18 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP7 | JP8 | JP9 | JP10 | JP17 |
|----------+---------+---------+---------+---------+---------|
| 25MHz | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
|----------+---------+---------+---------+---------+---------|
| 33MHz | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
|----------+---------+---------+---------+---------+---------|
| 40MHz | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
|----------+---------+---------+---------+---------+---------|
| 50iMHz | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
|----------+---------+---------+---------+---------+---------|
| 50MHz | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+---------+---------+---------+---------+---------|
| 66iMHz | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: The jumper settings for the Pentium processor are |
| unknown. Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note:Not all options listed in this document are available |
| on each motherboard. |
+------------------------------------------------------------+