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# ADAPTEC, INC.
ACB-4000A, ACB-4070
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | None (SCSI to ST506 interface) |
|--------------------------+---------------------------------|
| Size: | Drive card |
|--------------------------+---------------------------------|
| Hard drives supported: | SCSI to two RLL ST506 drives |
|--------------------------+---------------------------------|
| Floppy drives supported: | None |
+------------------------------------------------------------+
IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|----------------------------------------------+-------------|
| 20-pin data cable connector-drive 0 | CN0 |
|----------------------------------------------+-------------|
| 20-pin data cable connector-drive 1 | CN1 |
|----------------------------------------------+-------------|
| 34-pin control cable connector-hard drive(s) | CN2 |
|----------------------------------------------+-------------|
| 4-pin connector-DC power | CN3 |
|----------------------------------------------+-------------|
| 50-pin SCSI connector-to host adapter | CN4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SCSI ADDRESS |
|------------------------------------------------------------|
| SCSI ID | JP5/Jumper 1 | JP5/Jumper 2 | JP5/Jumper 3 |
|------------+---------------+---------------+---------------|
| | 0 | open | open | open |
|----+-------+---------------+---------------+---------------|
| | 1 | closed | open | open |
|----+-------+---------------+---------------+---------------|
| | 2 | open | closed | open |
|----+-------+---------------+---------------+---------------|
| | 3 | closed | closed | open |
|----+-------+---------------+---------------+---------------|
| | 4 | open | open | closed |
|----+-------+---------------+---------------+---------------|
| | 5 | closed | open | closed |
|----+-------+---------------+---------------+---------------|
| | 6 | open | closed | closed |
|----+-------+---------------+---------------+---------------|
| » | 7 | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|----------------------------------+------------+------------|
| » | Write precomp. disabled | JP2 | pins 1 & 2 |
| | (ACB-4000A only) | | closed |
|---+------------------------------+------------+------------|
| | Write precomp. same as | JP2 | pins 2 & 3 |
| | R.W.C. (ACB-4000A only) | | closed |
|---+------------------------------+------------+------------|
| | Write precomp. to all tracks | JP2 | pins 2 & 4 |
| | enabled (ACB-4000A only) | | closed |
|---+------------------------------+------------+------------|
| » | DMA transfer rate is | JP5/jumper | closed |
| | SYSCLOCK/4 | 4 | |
|---+------------------------------+------------+------------|
| | DMA transfer rate is | JP5/jumper | open |
| | DATACLOCK/2 | 4 | |
|---+------------------------------+------------+------------|
| » | Extended command set enable | JP5/jumper | closed |
| | - SASI compatible | 5 | |
|---+------------------------------+------------+------------|
| | Extended command set | JP5/jumper | open |
| | disabled | 5 | |
|---+------------------------------+------------+------------|
| » | Not used | JP5/jumper | open |
| | | 6 | |
|---+------------------------------+------------+------------|
| » | Supports the SEEK COMPLETE | JP5/jumper | closed |
| | line during head switches | 7 | |
|---+------------------------------+------------+------------|
| | SEEK COMPLETE Cmd. not | JP5/jumper | open |
| | supported | 7 | |
|---+------------------------------+------------+------------|
| » | Self-diagnostics enabled | JP5/jumper | closed |
| | | 8 | |
|---+------------------------------+------------+------------|
| | Normal operation | JP5/jumper | open |
| | | 8 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| The function of JP1 is to determine the select technique |
| used to interface the host adapter. |
| |
| Soldering Pin 2 to Pin "P" allows for the "pulse" select |
| that is used by controllers designed to work with SASI |
| hosts. Soldering Pin 2 to Pin "H" or "L" allows for the |
| "level" select signal used in accordance with SCSI |
| standards. |
+------------------------------------------------------------+
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