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# ADAPTEC, INC.
AHA-2840A
Card Type Hard drive controller card
Hard Drives supported Up to 7 SCSI devices
Floppy drives supported None
Data Bus 32-bit VESA Local Bus
Card Size Full-length, full-height card
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location | Function | Location |
|------------------------+----------+-------------+----------|
| 4-pin LED connector | J1 | 50-pin SCSI | J4 |
| | | connector - | |
| | | external | |
|------------------------+----------+-------------+----------|
| 50-pin SCSI connector | J3 | | |
| - internal | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------------+-------+-----------|
| » | Write-back enabled | J5 | Closed |
|---+------------------------------------+-------+-----------|
| | Write-back disabled | J5 | Open |
|---+------------------------------------+-------+-----------|
| » | Factory configured - do not alter | S1/5 | Reserved |
|---+------------------------------------+-------+-----------|
| » | Host adapter BIOS enabled | S1/8 | Off |
|---+------------------------------------+-------+-----------|
| | Host adapter BIOS disabled | S1/8 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O ADDRESS SELECTION |
|------------------------------------------------------------|
| Address | S1/1 | S1/2 | S1/3 | S1/4 |
|----------------+----------+----------+----------+----------|
| » | 1C00h | Off | Off | Off | Off |
|---+------------+----------+----------+----------+----------|
| | 2C00h | On | Off | Off | Off |
|---+------------+----------+----------+----------+----------|
| | 3C00h | Off | On | Off | Off |
|---+------------+----------+----------+----------+----------|
| | 4C00h | On | On | Off | Off |
|---+------------+----------+----------+----------+----------|
| | 5C00h | Off | Off | On | Off |
|---+------------+----------+----------+----------+----------|
| | 6C00h | On | Off | On | Off |
|---+------------+----------+----------+----------+----------|
| | 7C00h | Off | On | On | Off |
|---+------------+----------+----------+----------+----------|
| | 8C00h | On | On | On | Off |
|---+------------+----------+----------+----------+----------|
| | 9C00h | Off | Off | Off | On |
|---+------------+----------+----------+----------+----------|
| | AC00h | On | Off | Off | On |
|---+------------+----------+----------+----------+----------|
| | BC00h | Off | On | Off | On |
|---+------------+----------+----------+----------+----------|
| | CC00h | On | On | Off | On |
|---+------------+----------+----------+----------+----------|
| | DC00h | Off | Off | On | On |
|---+------------+----------+----------+----------+----------|
| | EC00h | On | Off | On | On |
|---+------------+----------+----------+----------+----------|
| | FC00h | Off | On | On | On |
|---+------------+----------+----------+----------+----------|
| | Reserved | On | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ADDRESS SELECTION |
|------------------------------------------------------------|
| Address | S1/6 | S1/7 |
|------------------------+-----------------+-----------------|
| | C8000h | On | Off |
|---+--------------------+-----------------+-----------------|
| | D0000h | Off | On |
|---+--------------------+-----------------+-----------------|
| » | D8000h | Off | Off |
|---+--------------------+-----------------+-----------------|
| | E0000h | On | On |
+------------------------------------------------------------+