MFM/RLL data recovery

[Randy McLaughlin]

From: "Fred Cisin" <cisin at xenosoft.com>
Sent: Monday, April 04, 2005 4:57 PM
>> On Mon, 2005-04-04 at 16:21 -0500, Ryan Underwood wrote:
>> > Now, I'm either doing something wrong or all these drives are dead.
>> > I am using a floppy cable with a twist in it and a 20-pin data cable.
> On Mon, 4 Apr 2005, Jules Richardson wrote:
>> I don't remember ever using a twisted cable with a hard disk, only with
>> floppy drive (and then only in the PC world). I think both control /
>> data cables should just be straight through.
>
> IBM used a twisted cable with their hard disks - in order to avoid having
> to explain "Drive Select" jumpers to their [Computerland level] dealers.
>
> The hard drive cable twist is NOT the same twist as for floppies!
>
> --
> Grumpy Ol' Fred     cisin at xenosoft.com

If all you have is a twisted floppy cable use the "B-drive" connector 
(before the twist).  Make sure the drive has the first drive selected.

As stated IBM used a different twisted cable for hard drives and as with 
floppies both possible hard drives used the second drive select line. 
Unlike the floppy you can use a straight cable and use the first drive 
select, the floppy cable changes more than just drive select.


Randy
www.s100-manuals.com