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# ALPHA RESEARCH CORPORATION
S455S
Data bus: 16-bit, ISA
Size: Full-length, full-height card
Hard drive supported: Up to seven SCSI drives
Floppy drives supported: 360KB, 720KB, 1.2MB, or 1.44MB (2)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|---------------------------------------------+--------------|
| SCSI drive interface (50 pin) external | CN1 |
|---------------------------------------------+--------------|
| SCSI drive interface (50 pin) internal | CN2 |
|---------------------------------------------+--------------|
| Floppy drive interface | CN3 |
|---------------------------------------------+--------------|
| Hard drive activity LED | JP1 |
|---------------------------------------------+--------------|
| Speaker | JP2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|-------------------------------+--------------+-------------|
| ยป | Floppy drive enabled | JP3 | closed |
|---+---------------------------+--------------+-------------|
| | Floppy drive disabled | JP3 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| This controller supports 256KB, 1MB, or 4MB fast page mode |
| SIMM's , 80nsec or faster. All four SIMM sockets must be |
| filled with the same size SIMM's for proper operation |
+------------------------------------------------------------+