25 Oct
2005
25 Oct
'05
8:46 p.m.
>You still have to put up with the
"blindness' during the IAM interval and
>the lack of support for MFM 128-byte sectors--and the lack of support for
>non-standard address marks (not at all uncommon in old formats). At least
>with the WD chips, you can read the raw track data.
On Tue, 25 Oct 2005, Allison wrote:
Ah huh, what?
The IAM interval is easily handled by masking that signal. (interrupt the
cable, or (on older cruder drives) cover the index with tape.)
Who does 128byte MF sectors??? If you really have to
it's
possible to tell a 765 that it's a short sector in mfm.
I have half a dozen formats that I was unable to put into XenoCopy,
due to 128 MFM. I never could get reliable reading, so I did those with
a 1791.
As to non standard
address marks that was a tandyism and 765 "read deleted" works.
I don't remember any non-standard address marks other than Tandy, but
there could have been.
'course the 1791 didn't want to write all of the ones that the 1771 did!
I understand that the 765 multi-sector "track read" was better for MOST of
the market, but WE would rather have had the WD style "raw" track read.
--
Grumpy Ol' Fred cisin at xenosoft.com