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- From: gblock@csd4.csd.uwm.edu (Gregory R Block)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Docs on adding 2nd HD to A3000.
- Date: 29 Jan 1993 00:23:33 GMT
- Organization: University of Wisconsin - Milwaukee
- Lines: 48
- Message-ID: <1k9te5INNptq@uwm.edu>
- References: <1993Jan28.173912.1@sevmsa.cs.msstate.edu>
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-
- In article <1993Jan28.173912.1@sevmsa.cs.msstate.edu>, gowen@sevmsa.cs.msstate.edu wrote:
-
- In case someone, perhaps you, is curious:
-
- : (A0 should be open with no jumper attached to its two pins). All A3000's come
- : with the internal hard drive at SCSI address six (in binary %110) while the
- : SCSI controller is always at address seven and can never change addresses;
- : therefore, no SCSI device is ever at address seven since the controller
- : reserves this address for itself. I do not understand why Commodore set the
- : internal SCSI address at six when the boot disk (i.e., the original hard drive)
- : should be at address zero since this allows the machine to boot faster. I
- : changed my original hard drive's SCSI address from six to zero by removing all
- : the jumpers. I set my new hard drive's SCSI address to one by putting a jumper
-
- Alright. Why? It's simple. Some drives, such as many SeaCrate/Seagate
- drives, take a longer time to spin up than normal. By setting the drive
- to 6, you give that drive lots of extra time to "spin up", thereby
- insuring that the drive is ready by the time the controller is ready.
- This is actually a fairly large problem for a lot of people, it's often
- the reason some people can only get their hard drive to "register" on
- warm boots, and not on cold boots.
-
- By setting the drive to 6, they minimized problems with this. It was
- actually very smart of C=. :)
-
- Best advice is to experiment. Some drives need more spin-up time than
- others. If you have problems with the drive not being recognized in
- time on cold boots, move it back a notch or two, and it might work.
-
- Of course, the best solution is to say the hell with time, and start at
- six and work your way down, putting your faster drives closer to 0.
-
- : The final step! Turn on your A3000, which should boot up just fine. If
- : your A3000 does not come up, then something went wrong (obviously). Go back
- : and check all your connects and try again. If all else fails, feel free to
- : call me for help. Now that your Amiga is up and running, you should execute
-
- You might want to mention the above here...
-
- Good doc. :)
-
- Greg
-
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