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# AMERICAN MEGATRENDS, INC.
Omni Business Partner
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium
Overdrive
Processor 20/25/33/50(internal)/66(internal)MHz
Speed
Chip Set AMI
Max. Onboard 20MB
DRAM
Cache 256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 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 |
|----------------------+----------+---------------+----------|
| IDE interface | J2 | RJ48 10BaseT | J35 |
| | | connector | |
|----------------------+----------+---------------+----------|
| Onboard battery | J5 | SCSI LED | J37 |
|----------------------+----------+---------------+----------|
| PS/2 mouse connector | J6 | Speaker | J38 |
|----------------------+----------+---------------+----------|
| External battery | J8 | Reset switch | J39 |
|----------------------+----------+---------------+----------|
| Serial port 2 | J11 | Turbo switch | J40 |
|----------------------+----------+---------------+----------|
| Secondary cache | J12 | BNC 10Base2 | J41 |
| connector | | connector | |
|----------------------+----------+---------------+----------|
| SCSI connector | J15 | IDE interface | J42 |
| (internal) | | LED | |
|----------------------+----------+---------------+----------|
| Serial port 1 | J16 | Turbo LED | J43 |
|----------------------+----------+---------------+----------|
| SCSI 1 | J17 | Keyboard lock | J44 |
| | | connector | |
|----------------------+----------+---------------+----------|
| VGA port | J31 | Parallel port | P3 |
|----------------------+----------+---------------+----------|
| AUI connector | J32 | Floppy drive | P4 |
| | | interface | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | PowerGood signal from | J1 | Open |
| | DS1231 | | |
|---+---------------------------+---------------+------------|
| | PowerGood signal not from | J1 | Closed |
| | DS1231 (not installed) | | |
|---+---------------------------+---------------+------------|
| » | Factory configured do not | J3 | N/A |
| | alter | | |
|---+---------------------------+---------------+------------|
| » | Flash ROM programming | J7 | Open |
| | disabled | | |
|---+---------------------------+---------------+------------|
| | Flash ROM programming | J7 | Closed |
| | enabled | | |
|---+---------------------------+---------------+------------|
| » | Factory configured do not | J20 | Closed |
| | alter | | |
|---+---------------------------+---------------+------------|
| » | Video memory DRAM cycle | J21 | Open |
| | select (6 MCLK RAS) | | |
|---+---------------------------+---------------+------------|
| | Video memory DRAM cycle | J21 | Closed |
| | select (7 MCLK RAS) | | |
|---+---------------------------+---------------+------------|
| » | VGA controller IRQ NOT | J22 | Open |
| | routed to IRQ9 | | |
|---+---------------------------+---------------+------------|
| | VGA controller IRQ routed | J22 | Closed |
| | to IRQ9 | | |
|---+---------------------------+---------------+------------|
| » | Enables IRQ12 for onboard | J27 | pins 2 & 3 |
| | PS/2 mouse | | closed |
|---+---------------------------+---------------+------------|
| | Disables IRQ12 for | J27 | pins 1 & 2 |
| | onboard PS/2 mouse | | closed |
|---+---------------------------+---------------+------------|
| » | Enables IRQ10 for NCR | J28 | Closed |
| | SCSI I/O processor | | |
|---+---------------------------+---------------+------------|
| | Disables IRQ10 for NCR | J28 | Open |
| | SCSI I/O processor | | |
|---+---------------------------+---------------+------------|
| » | Enables IRQ11 for onboard | J29 | Closed |
| | LAN controller | | |
|---+---------------------------+---------------+------------|
| | Disables IRQ11 for | J29 | Open |
| | onboard LAN controller | | |
|---+---------------------------+---------------+------------|
| » | VGA onboard controller | J33 | Closed |
| | enabled | | |
|---+---------------------------+---------------+------------|
| | VGA onboard controller | J33 | Open |
| | disabled | | |
|---+---------------------------+---------------+------------|
| » | CMOS memory normal | J34 | pins 2 & 3 |
| | operation | | closed |
|---+---------------------------+---------------+------------|
| | CMOS memory clear | J34 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Onboard SCSI termination | J36 | pins 2 & 3 |
| | chip enabled | | closed |
|---+---------------------------+---------------+------------|
| | Onboard SCSI termination | J36 | pins 1 & 2 |
| | chip disabled | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured do not | SW1/1 | Off |
| | alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select | SW1/2 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| | Monitor type select color | SW1/2 | On |
|---+---------------------------+---------------+------------|
| | 64KB Cache enabled | SW2/1, 2, 3, | Off |
| | | 4 | |
|---+---------------------------+---------------+------------|
| | 256KB Cache enabled | SW2/1, 2, 3, | On |
| | | 4 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT IRQ CONFIGURATION |
|------------------------------------------------------------|
| Port 1 | Port 2 (J11) | J25 | J26 |
| (J16) | | | |
|-------------+--------------+---------------+---------------|
| » | IRQ4 | IRQ3 | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
|----+--------+--------------+---------------+---------------|
| | IRQ3 | IRQ4 | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY CONFIGURATION |
|------------------------------------------------------------|
| Frequency | J9 | J10 |
|------------------------+------------------+----------------|
| » | 33 Mhz | Open | Open |
|----+-------------------+------------------+----------------|
| | 25 MHz | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | J13 | J14 |
|--------------------+-------------------+-------------------|
| 80486SX | pins 1 & 2 closed | pins 2 & 3 closed |
|--------------------+-------------------+-------------------|
| 80487SX | pins 2 & 3 closed | all closed |
|--------------------+-------------------+-------------------|
| 80486DX | pins 1 & 2 closed | all closed |
|--------------------+-------------------+-------------------|
| ODP486SX | pins 2 & 3 closed | all closed |
|--------------------+-------------------+-------------------|
| 80486DX2 | pins 1 & 2 closed | all closed |
|--------------------+-------------------+-------------------|
| Pentium Overdrive | pins 2 & 3 closed | all closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MEMORY CLOCK SPEED OF THE CLGD5426 |
|------------------------------------------------------------|
| Frequency | J23 | J24 |
|--------------------+-------------------+-------------------|
| 50.11 MHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 44.74 MHz | Closed | Open |
|--------------------+-------------------+-------------------|
| 41.16 MHz | Open | Closed |
|--------------------+-------------------+-------------------|
| 37.58 MHz | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+---------------+-------------+----------+------------|
| 1MB | (1) 256K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+----------+------------|
| 2MB | (1) 256K x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+----------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+----------+------------|
| 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+----------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+----------+------------|
| 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+----------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+---------------+-------------+----------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+---------------+-------------+----------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+----------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+----------+------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+----------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+----------+------------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+----------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+---------------+-------------+----------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+----------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+