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# ACHITEC CORPORATION, LTD.
ACHI-156
Device Type Mainboard
Processor CX 6X86/IBM 6X86/CX 686MX/IBM 6X86MX/IDT/AM
K5/
AM K6/Pentium
Processor Speed 120/133/150/166/180/200/233/266/300/333MHz
Chip Set VIA
Video Chip Set None
Maximum Onboard 1GB (EDO & SDRAM supported)
Memory
Maximum Video None
Memory
Cache 512KB
BIOS Award
Dimensions 220mm x 220mm
I/O Options 32-bit PCI slots (3), floppy drive interface,
IDE interfaces (2), parallel port, PS/2 mouse
interface, serial ports (2), IR connector,
USB connector, ATX power connector, AGP slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| AGP slot | AGP | IDE interface | J14 |
| | | LED | |
|-------------------+----------+------------------+----------|
| ATX power | ATX | Soft off power | J15 |
| connector | | supply | |
|-------------------+----------+------------------+----------|
| Serial port | CN1 | Reset switch | J16 |
|-------------------+----------+------------------+----------|
| Serial port | CN2 | Green PC LED | J17 |
|-------------------+----------+------------------+----------|
| Parallel port | CN3 | Turbo switch | J18 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | Power LED & | J19 |
| interface | | keylock | |
|-------------------+----------+------------------+----------|
| IDE interface | CN5 | Speaker | J20 |
|-------------------+----------+------------------+----------|
| IDE interface | CN6 | 32-bit PCI slots | PC1 - |
| | | | PC3 |
|-------------------+----------+------------------+----------|
| PS/2 mouse | CN7 | USB connector | USB |
| interface | | | |
|-------------------+----------+------------------+----------|
| IR connector | J3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | C1 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | C2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | C3 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | C4 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Power supply select AT | J11 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Power supply select ATX | J11 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | J12 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | J12 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 8MB | (2) 1M x 36 |
|----------------------------+-------------------------------|
| 16MB | (2) 2M x 36 |
|----------------------------+-------------------------------|
| 32MB | (2) 4M x 36 |
|----------------------------+-------------------------------|
| 64MB | (2) 8M x 36 |
|----------------------------+-------------------------------|
| 128MB | (2) 16M x 36 |
|----------------------------+-------------------------------|
| 256MB | (2) 32M x 36 |
|----------------------------+-------------------------------|
| 512MB | (2) 64M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 1M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 24MB | (1) 2M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 64 | None |
|------------------+--------------------+--------------------|
| 32MB | (1) 2M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 40MB | (1) 4M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 64 | None |
|------------------+--------------------+--------------------|
| 64MB | (1) 4M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 72MB | (1) 8M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 80MB | (1) 8M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 96MB | (1) 8M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 128MB | (1) 16M x 64 | None |
|------------------+--------------------+--------------------|
| 128MB | (1) 8M x 64 | (1) 8M x 64 |
|------------------+--------------------+--------------------|
| 136MB | (1) 16M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 144MB | (1) 16M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 160MB | (1) 16M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 192MB | (1) 16M x 64 | (1) 8M x 64 |
|------------------+--------------------+--------------------|
| 256MB | (1) 32M x 64 | None |
|------------------+--------------------+--------------------|
| 256MB | (1) 16M x 64 | (1) 16M x 64 |
|------------------+--------------------+--------------------|
| 264MB | (1) 32M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 272MB | (1) 32M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 288MB | (1) 32M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 320MB | (1) 32M x 64 | (1) 8M x 64 |
|------------------+--------------------+--------------------|
| 384MB | (1) 32M x 64 | (1) 16M x 64 |
|------------------+--------------------+--------------------|
| 512MB | (1) 32M x 64 | (1) 32M x 64 |
|------------------+--------------------+--------------------|
| 512MB | (1) 64M x 64 | None |
|------------------+--------------------+--------------------|
| 520MB | (1) 64M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 528MB | (1) 64M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 544MB | (1) 64M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 576MB | (1) 64M x 64 | (1) 8M x 64 |
|------------------+--------------------+--------------------|
| 640MB | (1) 64M x 64 | (1) 16M x 64 |
|------------------+--------------------+--------------------|
| 768MB | (1) 64M x 64 | (1) 32M x 64 |
|------------------+--------------------+--------------------|
| 1024MB | (1) 64M x 64 | (1) 64M x 64 |
|------------------------------------------------------------|
| Note: Board accepts SDRAM memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | J6 | J7 |
|------------------+--------------------+--------------------|
| 3.3v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 5v | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 512KB | (1) 64K x 64 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2x | On |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2x | On |Off |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 60MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 75MHz | 2x | On |Off |Off |Off | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM 6X86) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2x | On |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2x | On |Off |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 60MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 75MHz | 2x | On |Off |Off |Off | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86MX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 75MHz | 2.5x | On | On |Off |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 66MHz | 3x |Off | On |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 266MHz | 75MHz | 3x |Off | On |Off |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 266MHz | 66MHz | 3.5x |Off |Off |Off | On |Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM 6X86MX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 75MHz | 2.5x | On | On |Off |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 66MHz | 3x |Off | On |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 266MHz | 75MHz | 3x |Off | On |Off |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 266MHz | 66MHz | 3.5x |Off |Off |Off | On |Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IDT) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 180MHz | 60MHz | 3x |Off | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x |Off | On |Off | On |Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K5) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 120MHz | 60MHz | 2x | On |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 133MHz | 66MHz | 2x | On |Off |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On |Off | On |Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K6) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 180MHz | 60MHz | 3x |Off | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x |Off | On |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 66MHz | 3.5x |Off |Off |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 266MHz | 66MHz | 4x | On | On | On | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 300MHz | 66MHz | 4.5x | On | On | On | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 333MHz | 66MHz | 5x |Off | On | On | On |Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 120MHz | 60MHz | 2x | On |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 133MHz | 66MHz | 2x | On |Off |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 180MHz | 60MHz | 3x |Off | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x |Off | On |Off | On |Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL MMX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|S1/1|S1/2|S1/3|S1/4|S1/5|S1/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 180MHz | 60MHz | 3x |Off | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x |Off | On |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 66MHz | 3.5x |Off |Off |Off | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 266MHz | 66MHz | 4x | On | On | On | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 300MHz | 66MHz | 4.5x | On | On | On | On |Off | On |
|---------+---------+----------+----+----+----+----+----+----|
| 333MHz | 66MHz | 5x |Off | On | On | On |Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|------------+-----------+-----------+-----------+-----------|
| 2.0 | Off | Off | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.1 | On | Off | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.2 | Off | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.3 | On | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.4 | Off | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.5 | On | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.6 | Off | On | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.7 | On | On | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 2.8 | Off | Off | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 2.9 | On | Off | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 3.0 | Off | On | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 3.1 | On | On | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 3.2 | Off | Off | On | On |
|------------+-----------+-----------+-----------+-----------|
| 3.3 | On | Off | On | On |
|------------+-----------+-----------+-----------+-----------|
| 3.4 | Off | On | On | On |
|------------+-----------+-----------+-----------+-----------|
| 3.5 | On | On | On | On |
+------------------------------------------------------------+