ADAPTEC, INC.
ACB-4000A, ACB-4070
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| |
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Data bus: |
None (SCSI to ST506 interface) |
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Size: |
Drive card |
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Hard drives supported: |
SCSI to two RLL ST506 drives |
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Floppy drives supported: |
None |
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CONNECTIONS | |
|
Function |
Location |
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20-pin data cable connector-drive 0 |
CN0 |
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20-pin data cable connector-drive 1 |
CN1 |
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34-pin control cable connector-hard drive(s) |
CN2 |
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4-pin connector-DC power |
CN3 |
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50-pin SCSI connector-to host adapter |
CN4 |
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SCSI ADDRESS | ||||
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SCSI ID |
JP5/Jumper 1 |
JP5/Jumper 2 |
JP5/Jumper 3 | |
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0 |
open |
open |
open | |
|
1 |
closed |
open |
open | |
|
2 |
open |
closed |
open | |
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3 |
closed |
closed |
open | |
|
4 |
open |
open |
closed | |
|
5 |
closed |
open |
closed | |
|
6 |
open |
closed |
closed | |
|
7 |
closed |
closed |
closed | |
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USER CONFIGURABLE SETTINGS | |||
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Function |
Location |
Setting | |
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Write precomp. disabled (ACB-4000A only) |
JP2 |
pins 1 & 2 closed | |
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Write precomp. same as R.W.C. (ACB-4000A only) |
JP2 |
pins 2 & 3 closed | |
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Write precomp. to all tracks enabled (ACB-4000A only) |
JP2 |
pins 2 & 4 closed | |
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DMA transfer rate is SYSCLOCK/4 |
JP5/jumper 4 |
closed | |
|
DMA transfer rate is DATACLOCK/2 |
JP5/jumper 4 |
open | |
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Extended command set enable - SASI compatible |
JP5/jumper 5 |
closed | |
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Extended command set disabled |
JP5/jumper 5 |
open | |
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Not used |
JP5/jumper 6 |
open | |
|
Supports the SEEK COMPLETE line during head switches |
JP5/jumper 7 |
closed | |
|
SEEK COMPLETE Cmd. not supported |
JP5/jumper 7 |
open | |
|
Self-diagnostics enabled |
JP5/jumper 8 |
closed | |
|
Normal operation |
JP5/jumper 8 |
open | |
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MISCELLANEOUS TECHNICAL NOTES |
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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. |