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| Author | scsi tutorial (Read 12341 times) | ||||||||||||||||||||||||||
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madmann
256 MB  Posts: 284  
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on: February 03, 2008, 03:17
I think a tutorial is in order for scsi stuff. i will search the forums and compile a tutorial. Some of our newer members may not be that versed in setting scsi ids. problems etc. i know that i am forgetting a lot of good stuff. please attach any scsi knowledge that you have to this thread. |
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jjbomfim
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32 MB Posts: 55
Reply #1 on: February 05, 2008, 01:44
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A scsi tutorial would be a welcome addition. Regarding older Macs, I think it is one of the biggest headache sources, right along PC-Mac networking. I'll check it out as soon as it's up. Thanks!
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Minimalist
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128 MB Posts: 186
Reply #2 on: February 05, 2008, 04:14
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I never thought of SCSI on a Mac to be so difficult that it warranted a tutorial or howto. But I suppose...
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dpaanlka
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1024 MB Posts: 1646
Reply #3 on: February 05, 2008, 04:24
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Various systems have a wide variety of different SCSI "issues" that need explaining, but this is the very reason why it would be difficult to make one go-to tutorial for Mac SCSI.
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wove
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1024 MB Posts: 1363
Reply #4 on: February 05, 2008, 15:23
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I posted this on Nov 7, 2007. While it is not a definitive tutorial, it covers some basic ground. Feel free to use it as a starting point. Quote. . . Problems with SCSI devices are most commonly related to two issues. The first is SCSI ids and the second termination. Every internal SCSI device must have a unique SCSI id. SCSI ids on hard drive are set with jumpers on the drive. SCSI itself have no rules for device numbering however by convention Macs typically use the following numbers. id 0 internal boot drive id 2 external scanner id 3 internal CD ROM id 5 internal ZIP drive id 7 SCSI controller on mother board On hard drives the SCSI id is set using jumpers. There are generally 3 jumpers that are set in a binary pattern to create the ids: ooo id 0 x00 id 1 oxo id 2 xxo id 3 oox id 4 xox id 5 oxx id 6 xxx id 7 Specifics for a drive can usually be found on the manufactures web site. Make sure each device has a unique id. Most likely the drive that came in the machine will be 0 and the CD will be 3. If the ribbon cable has more connections than there are devices it is best practice to have a device on the last connection leaving any unused connectors somewhere in the middle. The assigned id numbers have no impact on the devices placement on the cable. As long as the ids are unique it does not matter what order they are connected to the cable. The last device on a SCSI chain must be terminated. Termination is on or off and is set via another jumper. If this information is not on the drive itself it can again be found via searching on the web. The only area of confusion that exists regarding termination is that there is jumper refered to as "Enable termination power" and it is often confused with turning termination on or off. There is no reason for an internal device on a Mac to ever have the Enable Termination power jumper set. In sum. Insure that each device on the SCSI chain has a unique id number. Have the last (and only the last) device on the cable have termination turned on. . . .End Quote bill bill
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jjbomfim
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32 MB Posts: 55
Reply #5 on: February 06, 2008, 00:35
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Quote from: "Minimalist" I never thought of SCSI on a Mac to be so difficult that it warranted a tutorial or howto. But I suppose... Relative to most of the things on the Mac, SCSI is difficult. It may not be difficult to computer savvy people, but for regular users it can be, especially when you compare it to other things on the Mac. I've wasted a lot of time in the past with non-working SCSI devices, and yet I never had to waste one second (on a Mac) to fix a non-working mouse, a non-workin keyboard, video signal, etc. I remember using Windows 3.1 and 95 and having to fix mouse driver errors and such, even though the mouse was plugged in there. With a Mac, you had a mouse plugged in, it always worked and you never had to fix it. SCSI wasn't like that.
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madmann
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256 MB Posts: 284
Reply #6 on: February 07, 2008, 02:33
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the purpose for this tutorial is not for the old users but the newer users. scsi is not the current standard it once was. It is not the difficult but an understanding is required. i have been looking up info toexpand upon the great stuff wove posted.
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