27 Jun
2012
27 Jun
'12
11:33 a.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] On Behalf Of Chuck Guzis
Sent: 27 June 2012 19:07
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: ST-506/412 to IDE/ATA/SCSI/? adaptor
On 27 Jun 2012 at 10:41, Tom Gardner wrote:
I don't see you need to worry, so long as you read back what you write, and
store the ECC in the device...
There has been a lot of discussion on this
subject and I
have tried to
read all of it, but I may have missed a
discussion of what
I think is
the key problem in such a product. Apologies in
advance if I am
repeating something.
I think you've got it right--my implementation seeks to simply sample
bit transitions without getting involved in the implementation of the
formatting details of IAMs, CRC/ECC--although one would expect that
MFM data is still MFM data. Hence the need for speed and RAM.
At least data rates are fairly standard--5MHz for MFM,
7.5MHz for 2,7
RLL.
--Chuck