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# ADAPTEC, INC.
AHA-1540A, AHA-1542A
Data bus: 16-bit, ISA
Size: Full-length, full-height card
Hard drives supported: Up to seven SCSI devices
Floppy drives supported: Two 360KB, 720KB, 1.2MB or 1.44MB
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|------------------------------------------+-----------------|
| 50-pin SCSI connector-external | CN1 |
|------------------------------------------+-----------------|
| 50-pin SCSI connector-internal | CN2 |
|------------------------------------------+-----------------|
| 34-pin data cable connector-floppy drive | CN4 |
|------------------------------------------+-----------------|
| 4-pin connector-drive active LED | J5 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SCSI ADDRESS |
|------------------------------------------------------------|
| SCSI ID | J1/jumper 4 | J1/jumper 5 | J1/jumper 6 |
|------------+---------------+---------------+---------------|
| » | 7 | open | open | open |
|----+-------+---------------+---------------+---------------|
| | 6 | closed | open | open |
|----+-------+---------------+---------------+---------------|
| | 5 | open | closed | open |
|----+-------+---------------+---------------+---------------|
| | 4 | closed | closed | open |
|----+-------+---------------+---------------+---------------|
| | 3 | open | open | closed |
|----+-------+---------------+---------------+---------------|
| | 2 | closed | open | closed |
|----+-------+---------------+---------------+---------------|
| | 1 | open | closed | closed |
|----+-------+---------------+---------------+---------------|
| | 0 | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|--------------------------------+--------------+------------|
| » | Synchronous negotiation | J1/jumper 1 | open |
| | disabled | | |
|---+----------------------------+--------------+------------|
| | Synchronous negotiation | J1/jumper 1 | closed |
| | enabled | | |
|---+----------------------------+--------------+------------|
| » | Factory test disabled | J1/jumper 2 | open |
|---+----------------------------+--------------+------------|
| | Factory test enabled | J1/jumper 2 | closed |
|---+----------------------------+--------------+------------|
| » | SCSI parity checking | J1/jumper 3 | open |
| | enabled | | |
|---+----------------------------+--------------+------------|
| | SCSI parity checking | J1/jumper 3 | closed |
| | disabled | | |
|---+----------------------------+--------------+------------|
| » | LA enable (Only on early | J8 | closed |
| | W1542A) | | |
|---+----------------------------+--------------+------------|
| | LA disable (Only on early | J8 | open |
| | W1542A) | | |
|---+----------------------------+--------------+------------|
| » | Auto request sense enabled | J9/jumper 1 | open |
|---+----------------------------+--------------+------------|
| | Auto request sense | J9/jumper 1 | closed |
| | disabled | | |
|---+----------------------------+--------------+------------|
| » | Factory configured - do | J9/jumpers | open |
| | not alter | 2-4 | |
|---+----------------------------+--------------+------------|
| » | BOIS enabled | J11 | closed |
|---+----------------------------+--------------+------------|
| | BIOS disabled | J11 | open |
|---+----------------------------+--------------+------------|
| » | Floppy address 3F0-3F7h | J12 | open |
|---+----------------------------+--------------+------------|
| | Floppy address 370-377h | J12 | closed |
|---+----------------------------+--------------+------------|
| » | Floppy drive enabled | J13 | closed |
|---+----------------------------+--------------+------------|
| | Floppy drive disabled | J13 | open |
|---+----------------------------+--------------+------------|
| » | Floppy drive Interrupt is | J17 | pins 1 & 2 |
| | IRQ6 | | closed |
|---+----------------------------+--------------+------------|
| | Floppy drive Interrupt is | J17 | pins 2 & 3 |
| | IRQ10 | | closed |
|---+----------------------------+--------------+------------|
| » | Floppy drive DMA Request | J18 | pins 1 & 2 |
| | is DREQ2 | | closed |
|---+----------------------------+--------------+------------|
| | Floppy drive DMA Request | J18 | pins 2 & 3 |
| | is DREQ3 | | closed |
|---+----------------------------+--------------+------------|
| » | Floppy drive DMA | J19 | pins 1 & 2 |
| | Acknowledge Is DACK2 | | closed |
|---+----------------------------+--------------+------------|
| | Floppy drive DMA | J19 | pins 2 & 3 |
| | Acknowledge is DACK3 | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL |
|------------------------------------------------------------|
| DRQ | J1/Jumper 7 | J1/Jumper | J14 | J15 |
| | | 8 | | |
|-------+-------------+-----------+--------------+-----------|
| | 0 | closed | closed | Jumper | Jumper |
| | | | | 1-closed | 1-closed |
|---+---+-------------+-----------+--------------+-----------|
| » | 5 | open | closed | Jumper | Jumper |
| | | | | 2-closed | 2-closed |
|---+---+-------------+-----------+--------------+-----------|
| | 6 | closed | open | Jumper | Jumper |
| | | | | 3-closed | 3-closed |
|---+---+-------------+-----------+--------------+-----------|
| | 7 | open | open | Jumper | Jumper |
| | | | | 4-closed | 4-closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT REQUEST |
|------------------------------------------------------------|
| IRQ | J1/Jumper | J1/Jumper | J1/Jumper | J16 |
| | 9 | 10 | 11 | |
|--------+-----------+-----------+-----------+---------------|
| | 9 | open | open | open | Jumper |
| | | | | | 1-closed |
|---+----+-----------+-----------+-----------+---------------|
| | 10 | closed | open | open | Jumper |
| | | | | | 2-closed |
|---+----+-----------+-----------+-----------+---------------|
| » | 11 | open | closed | open | Jumper |
| | | | | | 3-closed |
|---+----+-----------+-----------+-----------+---------------|
| | 12 | closed | closed | open | Jumper |
| | | | | | 4-closed |
|---+----+-----------+-----------+-----------+---------------|
| | 14 | open | open | closed | Jumper |
| | | | | | 5-closed |
|---+----+-----------+-----------+-----------+---------------|
| | 15 | closed | open | closed | Jumper |
| | | | | | 6-closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA TRANSFER RATE |
|------------------------------------------------------------|
| Speed | J1/jumper 12 | J1/jumper 13 |
|------------------+--------------------+--------------------|
| » | 5.0 | open | open |
|---+--------------+--------------------+--------------------|
| | 5.7 | closed | open |
|---+--------------+--------------------+--------------------|
| | 6.7 | open | closed |
|---+--------------+--------------------+--------------------|
| | 8.0 | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O PORT ADDRESS |
|------------------------------------------------------------|
| Address | J6/Jumper 1 | J6/Jumper 2 | J6/Jumper 3 |
|------------+---------------+---------------+---------------|
| | 334h | open | open | open |
|---+--------+---------------+---------------+---------------|
| » | 330h | open | open | closed |
|---+--------+---------------+---------------+---------------|
| | 234h | open | closed | open |
|---+--------+---------------+---------------+---------------|
| | 230h | open | closed | closed |
|---+--------+---------------+---------------+---------------|
| | 134h | closed | open | open |
|---+--------+---------------+---------------+---------------|
| | 130h | closed | open | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS WAIT STATE |
|------------------------------------------------------------|
| Delay |J7/jumper 1 |J7/jumper 2 |J7/jumper 3|J7/jumper 4|
|----------+------------+------------+-----------+-----------|
|»|Disable | closed | open | open | open |
|-+--------+------------+------------+-----------+-----------|
| |100nsec | open | closed | open | open |
|-+--------+------------+------------+-----------+-----------|
| |200nsec | open | open | closed | open |
|-+--------+------------+------------+-----------+-----------|
| |300nsec | open | open | open | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ADDRESS |
|------------------------------------------------------------|
| Address | J10/jumper 1 | J10/jumper 2 |
|------------------+--------------------+--------------------|
| » | DC000h | open | open |
|---+--------------+--------------------+--------------------|
| | CC000h | closed | open |
|---+--------------+--------------------+--------------------|
| | D8000h | open | closed |
|---+--------------+--------------------+--------------------|
| | C8000h | closed | closed |
+------------------------------------------------------------+