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Offline smerf

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Re: SCSI madness
« on: April 24, 2011, 03:08:34 AM »
Hi,
@CommodoreJohn,

I am a little groggy just woke up from a 3 hour nap, but here goes I will try to explain how a scsi system works.

First thing to remember is that a scsi system alway starts with the number 0 and on all Amiga systems ends with 6. That is 7 items that you can have hooked up at once, but scsi 0 is always the scsi card.

So here we go

scsi 0 = card
scsi 1 = scsi item 1
scsi 2 = scsi item 2

etc. etc to scsi item 6.

Now all your scsi items are in a chain that is they all hook up and go
scsi 0, scsi 1,  scsi 2, scsi 3, scsi 4, scsi 5, scsi 6.

Now comes the difficult part, the last scsi item must be terminated (I usually set one scsi item as 6 and make sure it has the termination bars in it.

OK, first thing is get on the internet if you are using a computer that can get you there, type in the number of your drive (mine is a conner CFP2107S) download the spec sheet of your drive and keep it in a book or safe place.  You will need this sheet badly, on there it tells you how to set up the drive numbers, where the terminators are etc.

Now like I said I always set one item up as scsi item 6, by scsi item I mean hard drives, scanners, draw tablets, CD/DVD players, scanners internal & external drives (hard drives or floppy) and this one is always terminated, now you can terminate at 4 or 3 but I like 6 because I have a zip drive that is either set at 1 or 6 and has the termination bars set in a settable switch and I ususally use this device as my 6 scsi.

Now what are termination bars, in my conner they are 2 little red bars by the ribbon cable plug on the top end of the hard drive circuit card. Like I said you will need your spec sheets on the item to find out where they are, if they are not the last item in your scsi string they must be pulled. Now when you pull them I have a freezer bag that I put them in and I mark the bag with from what scsi hard drive they came from and my bag is usually big enough to put my scsi spec sheet in with it. (I have about 15 scsi items). Now find a box and put your bag in there. Now if you don't have or lost these terminators, you can usually find them at Amigakit, or some of your electronic parts magazines.

Now:

Make the last item in the string have terminators (mine is usually set at 6)
Make sure all terminators are pulled from your middle drives.

Now your Commodore Mother boards are listed as scsi item 0, and in the back of the board are terminator strips, (you usually have to pull your Amiga 3000 apart to find them, Commodore had very poor engineers with the foresight of a piss ant, or else like every other thing they wanted to make it built so you would take it in and have them do it (but I think all their engineers just had the fore sight of a piss ant but I think all engineers are like that since I have to work with them every day)).

OK any questions just ask

smerf
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Offline smerf

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Re: SCSI madness
« Reply #1 on: April 24, 2011, 04:42:28 AM »
Quote from: commodorejohn;633316
Well, I've actually got it working now - it was pretty much just the issue of the cable having popped. Bleargh...


Hi,

OH YEAH!!

I forgot to mention always have your data cables plugged in and in external drives it also saves a lot of problems if it is plugged in to an outlet.

Just kidding

smerf
I have no idea what your talking about, so here is a doggy with a small pancake on his head.

MorphOS is a MAC done a little better
 

Offline smerf

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Re: SCSI madness
« Reply #2 on: April 24, 2011, 05:59:58 AM »
Quote from: Amigoat;633328
Hi Smerf -

generally agree with your guide on SCSI except that the Amiga narrow type SCSI handles 8 devices not 7. The 8th device is the controller having SCSI ID of 7. As I recall Commodore always (sometimes?) set the hard drive to device 6.

I know the order doesn't matter but I always set my system hard drive to device 0 and the ZIP drive to device 6.

Amigoat


HMMM!

Didn't know that, I just go by the old Adaptec boards for the PC. I know the older new Adaptec boards go up the 16 devices with the board being 0.

Thanks for the info
I have no idea what your talking about, so here is a doggy with a small pancake on his head.

MorphOS is a MAC done a little better
 

Offline smerf

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Re: SCSI madness
« Reply #3 on: April 27, 2011, 01:04:40 AM »
Quote from: rockape;633360
Hi commodorejohn,

For future reference.

See   http://www.wonkity.com/~wblock/SCSI/SCSIExamples.html


Regards, Michael

aka rockape


Hi,

@Rockape,

Why Thank You,

Even if I do know a little about scsi's this page will be worth copying and putting in my documentation drives for future reference.

At my age it is good to have reference's, after all I can't remember anything at my age.

smerf
I have no idea what your talking about, so here is a doggy with a small pancake on his head.

MorphOS is a MAC done a little better