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# ALPHA RESEARCH CORPORATION
S425I ISA
+------------------------------------------------------------+
+------------------------------------------------------------+
Data bus: 16-bit, ISA
Size: Three/quarter-length, full-height card
Hard drive supported: Four IDE (AT) interface drives
Floppy drives Two 360KB, 720KB, 1.2MB, or 1.44MB
supported:
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|--------------------------------------------+---------------|
| IDE drive interface (Primary) | CN1 |
|--------------------------------------------+---------------|
| IDE drive interface (Secondary) | CN2 |
|--------------------------------------------+---------------|
| Floppy drive interface | CN3 |
|--------------------------------------------+---------------|
| Hard Drive activity LED | JP1 |
|--------------------------------------------+---------------|
| Speaker | JP2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|-----------------------------------+--------------+---------|
| » | IDE Bus 1 (CN1) resistors | JDR0 | open |
| | open | | |
|---+-------------------------------+--------------+---------|
| | IDE Bus 1 (CN1) resistors | JDR0 | closed |
| | shorted | | |
|---+-------------------------------+--------------+---------|
| » | IDE Bus 2 (CN2) resistors | JDR1 | open |
| | open | | |
|---+-------------------------------+--------------+---------|
| | IDE Bus 2 (CN2) resistors | JDR1 | closed |
| | shorted | | |
|---+-------------------------------+--------------+---------|
| » | Floppy drive enabled | JP3/jumper 4 | closed |
|---+-------------------------------+--------------+---------|
| | Floppy drive disabled | JP3/jumper 4 | open |
|---+-------------------------------+--------------+---------|
| » | Primary hard drive enabled | JP3/jumper 5 | closed |
|---+-------------------------------+--------------+---------|
| | Secondary hard drive enabled | JP3/jumper 5 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ADDRESS CONFIGURATION |
|------------------------------------------------------------|
| Address | JP3/jumper 1 | JP3/jumper 2 | JP3/jumper 3 |
|---------------+--------------+--------------+--------------|
| DC000-DFFFFh | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| DC000-DFFFFh | closed | closed | open |
|---------------+--------------+--------------+--------------|
| D8000-DBFFFh | closed | open | closed |
|---------------+--------------+--------------+--------------|
| D4000-D7FFFh | closed | open | open |
|---------------+--------------+--------------+--------------|
| D0000-D3FFFh | open | closed | closed |
|---------------+--------------+--------------+--------------|
| CC000-CFFFFh | open | closed | open |
|---------------+--------------+--------------+--------------|
| D8000-CBFFFh | open | open | closed |
|---------------+--------------+--------------+--------------|
| Disabled | open | open | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| When using this controller, the system will see the drives |
| attached to each connector as a single drive. i.e.: if you |
| have two 100MB drives attached to CN1 the system will see |
| one 200MB drive. However, if have two drives you would |
| like to be recognize individually, you may attach one to |
| CN1 and the other to CN2. |
| |
| Closing Jumpers JDR0 and JDR1, which shorts the resistors |
| on the IDE buses, helps to eliminate drive incompatibility |
| caused by different noise filtration methods. |
| |
| This controller supports 256KB, 1MB, or 4MB fast page mode |
| SIMM's, 80nsec or faster. At least one bank must be filled |
| for proper operation. |
+------------------------------------------------------------+