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# AMERICAN MEGATRENDS, INC.
AMI 386SX-II
Processor 80386SX
Processor Speed 20/25MHz
Chip Set AMI
Max. Onboard 16MB
DRAM
Cache 32KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Floppy interface, IDE interface, parallel
port, serial ports (2)
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface LED | J1 | Turbo switch | J16 |
|-------------------+----------+------------------+----------|
| External battery | J7 | Parallel port | P4 |
|-------------------+----------+------------------+----------|
| Reset switch | J10 | Serial port 1 | P5 |
|-------------------+----------+------------------+----------|
| Turbo LED | J11 | Serial port 2 | P6 |
|-------------------+----------+------------------+----------|
| Power LED & | J12 | Floppy interface | P7 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J15 | IDE interface | P8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS ||
|-----------------------------------------------------------||
| Function | Jumper/Switch | Position ||
|---------------------------+---------------+---------------||
| » | DRAM address sequence | J2 | pins 1 & 2, 3 ||
| | select bank 1, then | | & 4 closed ||
| | bank 2 | | ||
|---+-----------------------+---------------+---------------||
| | DRAM address sequence | J2 | pins 2 & 3, 4 ||
| | select bank 2, then | | & 5 closed ||
| | bank 1 | | ||
|---+-----------------------+---------------+---------------||
| » | Serial port 2 select | J3 | pins 2 & 3 ||
| | IRQ3 | | closed ||
|---+-----------------------+---------------+---------------||
| | Serial port 2 select | J3 | pins 1 & 2 ||
| | IRQ4 | | closed ||
|---+-----------------------+---------------+---------------||
| » | Serial port 1 select | J4 | pins 2 & 3 ||
| | IRQ3 | | closed ||
|---+-----------------------+---------------+---------------||
| | Serial port 1) select | J4 | pins 1 & 2 ||
| | IRQ4 | | closed ||
|---+-----------------------+---------------+---------------||
| » | Factory configured - | J5 | pins 1 & 2 ||
| | do not alter | | closed ||
|---+-----------------------+---------------+---------------||
| » | On board battery | J6 | Closed ||
| | enabled | | ||
|---+-----------------------+---------------+---------------||
| | On board battery | J6 | Open ||
| | disabled | | ||
|---+-----------------------+---------------+---------------||
| » | Parallel port select | J8 | pins 2 & 3 ||
| | IRQ7 | | closed ||
|---+-----------------------+---------------+---------------||
| | Parallel port select | J8 | pins 1 & 2 ||
| | IRQ5 | | closed ||
|---+-----------------------+---------------+---------------||
| » | Power good signal | J9 | pins 2 & 3 ||
| | detect from power | | closed ||
| | supply | | ||
|---+-----------------------+---------------+---------------||
| | Power good signal | J9 | pins 1 & 2 ||
| | detect from board | | closed ||
|---+-----------------------+---------------+---------------||
| » | Factory configured - | J13 | pins 2 & 3 ||
| | do not alter | | closed ||
|---+-----------------------+---------------+---------------||
| » | Factory configured - | J14 | pins 1 & 2 ||
| | do not alter | | closed ||
|---+-----------------------+---------------+---------------||
| » | CMOS memory normal | J17 | Open ||
| | operation | | ||
|---+-----------------------+---------------+---------------||
| | CMOS memory clear | J17 | Closed ||
|---+-----------------------+---------------+---------------||
| » | Factory configured - | J18 | Open ||
| | do not alter | | ||
|---+-----------------------+---------------+---------------||
| » | Factory configured - | SW1/1 | Off ||
| | do not alter | | ||
|---+-----------------------+---------------+---------------||
| | Monitor type select | SW1/2 | On ||
| | color | | ||
|---+-----------------------+---------------+---------------||
| | Monitor type select | SW1/2 | Off ||
| | monochrome | | ||
|---+--------------------------------------------------------|
| | Note : Cache is factory installed and is not |
| | configurable. The size of the cache & tag chips are |
| | unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
+------------------------------------------------------------+