[rescue] Anybody remember MFM? (Durango Poppy II problem)

Dave McGuire mcguire at neurotica.com
Wed Aug 6 16:13:34 CDT 2003

On Wednesday, August 6, 2003, at 01:16 PM, Michael Free wrote:
> IIRC the 34 pin cable has a twist in it that identifies the drive at 
> the end
> of the line.
>> From a 1992 Winn L. Rosch hardware guide: There's a twist in 
>> connectors 25
> through 29 on the control cable (34 pin) denoting drive #1. There's 
> also a
> drive select jumper somewhere on the hard drive.

   The cable isn't *supposed* to have a twist in it.  That 
brain-deadness was started by IBM on the floppy interface to flip the 
device select bits around, so that they could have a big stock of 
floppy drives in the warehouse that were all jumpered the same.

   Sometimes that carried over into hard disk interfaces...just to flip 
the device select bits around.  Few systems other than PCs did crap 
like that.


Dave McGuire                 "You don't have Vaseline in Canada?"
St. Petersburg, FL                     -Bill Bradford

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