200 lines
8.8 KiB
Plaintext
200 lines
8.8 KiB
Plaintext
BASIC INSTALLATION PRODCEDURE for SCSI Drives
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by Ryan Ramsey -- June 22, 1992
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All Micropolis SCSI drives come pre-formatted from the factory. There is
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very little that needs to be done to this type of drive besides setting up
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termination and SCSI ID.
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SCSI ID SETTINGS
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----------------
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In order for the SCSI bus to be able to tell where it is getting its
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information from, it is neccessary for each drive to have a particular
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identification number. This identification number, known as the SCSI ID
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is set with jumpers on the back of the drive. All the drives in the SCSI
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chain must have a different number.
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These jumpers are located inside the 24-pin connect located on the back
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of the drive (next to the 50-pin cable connector).
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If you hold the drive with the cable connectors toward your body and
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the circuit board side facing upwards, you will see the power connector
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on the left, the 50-pin connector in the middle, and the 24-pin connector
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on the right.
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The jumpers for the 24-pin connector are as follows:
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50-Pin Connector 24-Pin Connector
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______________ _________________________________________________
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. . . . . . . | | o o o . . . . . . . . . . . . . . . . . . . . . |
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. . . . . . . | | o o o . . . . . . . . . . . . . . . . . . . . . |
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-------------/ \-----------------------------------------------/
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| | |
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| | ID2 (Value 4)
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| ID1 (Value 2)
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ID0 (Value 1)
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If this is the going to be the only drive in the system, it should be set
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to SCSI ID 0, which is attained by having NO jumpers in the first 3 pairs
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of the 24 pin connector. For every additional drive, the SCSI ID should
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be incremented by 1. So if you have 3 drives in the system, your primary
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drive should be at SCSI ID 0, your secondary at SCSI ID 1, and your final
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drive at SCSI id 2.
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SCSI ID can be computed as follows by installing jumpers in the following
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pairs of pins:
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SCSI ID ID0 ID1 ID2 SCSI ID ID0 ID1 ID2
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------------------------ ------------------------
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0 | 4 | X
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1 | X 5 | X X
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2 | X 6 | X X
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3 | X X 7 | X X X
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Each of the pairs of pins have values (as shown in the diagram). In order
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to get a certain SCSI id, just jumper the pins as you wish and the sum of
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the values is your SCSI ID. So if you have ID0 (value of 1) and ID2
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(value 4) jumpered, your SCSI id will be 5.
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NOTE: SCSI ID 7, should never be used. This is usually reserved for the
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host adapter.
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DRIVE TERMINATION
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-----------------
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Termination is something that causes a lot of undue grief for everyone, but
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the concept is really simple.
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"Only the last drive in the SCSI chain must be terminated,
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all others should be un-terminated."
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and
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"The SCSI chain must be terminated on both ends."
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There are two possible termination configurations.
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1. A HOST ADAPTER WITH ONLY INTERNAL OR ONLY EXTERNAL DRIVES
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This is the most common configuration, and this configuration applies
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to BOTH INTERNAL and EXTERNAL drives. The controller must be terminated
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(which is the way it comes from 99.99% of the manufacturers) AND the
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very last drive/component on the CABLE (do not get "the last drive on
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the cable" confused with the "last drive, which would be the highest
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SCSI ID").
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Therefore, a graphic display would look as follows:
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____
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/ \ External OR Internal
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| HOST |=====DEVICE=====DEVICE
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\____/ | |
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| UN-TERMINATED |
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TERMINATED TERMINATED
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(Usually default)
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So once again:
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If you have only one drive, it is to be TERMINATED.
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If you have more than one drive, all drives must be UN-TERMINATED
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except for the last PHYSICAL drive on the CABLE which must
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be TERMINATED.
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2. A HOST ADAPTER WITH INTERNAL AND EXTERNAL DRIVES
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This setup is a little bit trickier. If you have a host adapter that
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connects internal drives as well as external drives, the HOST ADAPTER
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must be UN-TERMINATED, the LAST drive on the INTERNAL cable must be
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TERMINATED, and the LAST drive on the EXTERNAL cable must be
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TERMINATED also.
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Therefore, your configuration would look like this.
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____
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Internal / \ External
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DEVICE====DEVICE====| HOST |====DEVICE====DEVICE
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| | UN-TERMINATED | |
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TERMINATED | | TERMINATED
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UN-TERMINATED UN-TERMINATED
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So once again, if you have drives on both ends of the controller card,
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the controller card must be UN-TERMINATED, and the last drive on each
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end of the SCSI BUS (Cable) must be TERMINATED.
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CABLE INSTALLATION
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------------------
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Once the two above items are checked and configured, all you need to
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do then is put the drive on the cable (matching the red stripe on the
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cable to pin one on the controller card) and then power on.
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TROUBLESHOOTING GUIDE
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---------------------
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PROBLEM
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2 drives or 7 drives are seen on the SCSI bus when only 1 drive is
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installed on the controller card.
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REMEDY
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Your drive is set to SCSI ID 7, which is what most host adapters are
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set as the default configuration. Change your SCSI id to anything
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other than 7 (also, you cannot use the same ID as another drive).
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PROBLEM
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When booting up the system, the machine gets hung up at the bios
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banner of the controller card.
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REMEDY
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There are a few possibilities for this problem.
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1. There is a drive set to the same SCSI ID as the controller card.
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Change the conflicting drive to a SCSI ID that is not in use.
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2. There are two drives with the same SCSI ID.
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Verify that all drives have different SCSI ID's.
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3. There could be a bios conflict.
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Change the bios address of the controller card to a different
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memory location.
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4. There could be a conflict with add in boards. Check and make sure
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that there are no memory conflicts with any add in boards or
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bios's, check DMA's, IRQ's, and port addresses.
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PROBLEM
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When you boot up, the computer gives you a message along the lines
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of "Drive C not found" or "Drive 0 not found".
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REMEDY
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Check your system CMOS. Set both drive 0 and drive 1 to
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"Not Installed" or 0. CMOS drive settings are for ESDI drives only
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so if you don't have an ESDI drive, it will cause havoc on your
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system.
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PROBLEM
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Drive does not appear to spin up or power-on.
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REMEDY
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Check to see if the power cable is connected and if power is actually
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on. Believe it or not, this is a re-occuring problem.
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If the drive still fails to spin up, check the self test seqence.
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Remove the SCSI cable from the drive and power it on. On the front
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of the drive there is a LED which will blink in a certain sequence.
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If the drive is 'healthy' the light sequence consist of 1 long blink
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and 3 short. If you get anything else or you get a repeating pattern,
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then the drive may be defective and you should call our technical
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support department for further advice.
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If you are experienceing a problem that is not approached in this
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document or you continue to have problems, you may do one of the
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following:
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1. Call our Technical Support Line at (818) 709-3325.
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2. Call our BBS at (818) 709-3310 and leave an email to the Sysop.
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3. FAX your request to us at (818) 718-5352.
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4. Mail your request to:
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Micropolis Corporation
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Attn: Technical Support
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21211 Nordhoff Street
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Chatsworth, CA 91311
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