DiscFerret: First working hardware, firmware and microcode!
cisin at xenosoft.com
Thu Nov 4 17:04:06 CDT 2010
> > 20 years would have to include "RLL" and ESDI (RLL has same cabling as
> > ST412, but different encoding and data-rates? , ESDI cabling looks the
On Thu, 4 Nov 2010, Tony Duell wrote:
> Eh? RLL is a date encoding scheme, ST412 is a de-facto stadnard for the
> signals on the drive interface connectors. They are not the same thing at
Thanks. I got sloppy. This is one situation where I should have said
"MFM", or clarified the comparison as "ST412 MFM", since I was trying to
say that the RLL drives were cabled the same, but the data transfer rates
and encoding may be different.
> > ESDI cabling looks the same but has signal differences)
> It's very different... For one thing the data separator is in the drive
> (meaning the encoding method doesn't matter to the end user). FOr
> another, head position, etc, is done by sending a command bit-serially to
> the drive.
What I was trying to convey (albeit poorly worded), is that the CABLES
used for ESDI are the same as the CABLES used for ST412 (from a
purchasing viewpoint), but the interface is different.
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