[Coco] again 3.5" drive

[Gene Heskett]

On Tuesday 22 April 2008, Joel Ewy wrote:
>Gene Heskett wrote:
>> On Tuesday 22 April 2008, Diego Barizo wrote:
>>> Once I was sure that the 3.5" drive was working OK, I went fishing for a
>>> cable that would let me connect 1x 5.25 + 1x3.5 drives
>>> Got one that is like this
>>> 3.5           5.25          3.5          5.25
>>> (unused)    controller      drive        drive
>>>
>>> ||------------|||------------||----------|||
>>> ||------------|||------------||----------|||
>>> ||------------|||------------||----------|||
>>>
>>> When I connect just one drive, the 3.5 acts as drive 1, and the 5.25 as
>>> drive 0
>>> But when both are connected, and I try to access drive 0, both drives
>>> light up.
>>> I removed the D0 jumper from the 5.25 (It had both D0 and D1, now just
>>> D1) and now both light up when accessing drive 1.
>>> I'm guessing this has to do with jumper settings on the 3.5 drive
>>> (doesn't have real jumpers, but there are 4 holes in the circuit board
>>> in an area labeled DX, with pairs marked as 1 and 0, without any
>>> connection between them).
>>> But if it were jumpered, wouldn't it always react as the selected drive?
>>> Or as drive 0 if working as single drive?
>>> My final goal is to have the 3.5 as 0, and the 5.25 as 1...
>>>
>>> Diego
>>
>> AFAIK Diego, all 3.5 drives are factory programmed as drive 1, and the
>> twist in the end section of the cable makes the one on the end of the
>> cable drive 0.
>
>Most are but not all.  I have some older drives that have nice little
>slide switches or jumpers to permit a right and proper drive selection
>just like God intended.  Most of these date from the time when you'd pay
>$50 for a 3.5" HD floppy drive and think that was a good deal.  I've
>also seen some that have unpopulated pads for jumpers or switches.  The
>newer drives though, are too cheap to bother with such niceties.
>
>JCE
>
>> Set the 5.25 as drive 1, and use a twisted cable with the 5.25" on the
>> untwisted connector in the middle.  No terms on the 5.25" either.
>>
>> Theoretically that should work, but then we've all seen that sig that says
>> its a long way from theory to practice. :-)

Which goes to prove the above, and that Murphy is alive and well regardless of 
how many wanted posters we print. :-)

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Intolerance is the last defense of the insecure.