[Coco] Yet another SCSI problem.

[Gene Heskett]

On Tuesday 02 January 2007 14:06, Leon Howell wrote:
>This is getting ridiculous. I thought SCSI was supposed to be reliable!
> Or is it just that I'm so dumb?
>
>I transplanted my CD-RW drive fron a modern plastic case to an older
> style metal case because it will stack neatly on top of my FD-502 case
> and take up less desk space.
>
>It worked before I transplanted it. Now it doesn't. Why? I suspect I
>reconected the drive select button wrong. How do I tell how to properly
>connect it? I thought it would respond as drive 0 if there was no drive
> select button or jumper, but it doesn't. What's wrong?

Most will have a little label on them someplace describing where to put 
the jumpers.

Another item that might apply is the power supply in the old case.  If its 
5 volt line is even 100 millivolts low, then all bets on scsi are off 
because the logic one state's noise margin has been reduced.  Fed with 
5.1 to 5.25 volts, scsi can be amazingly bulletproof when properly 
terminated, and while the mechanism will run just fine on 4.85 volts, 
scsi won't.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
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Copyright 2006 by Maurice Eugene Heskett, all rights reserved.