26 Oct
2005
26 Oct
'05
9:39 a.m.
(All always, the list management is broken, I don't have Allison's posting
yet, but the answers this posting...)
On Tue, 25 Oct 2005, Fred Cisin wrote:
The IAM interval is easily handled by masking that
signal. (interrupt the
cable, or (on older cruder drives) cover the index with tape.)
As a note: The IAM is not defined by the IBM standard, there's no IAM on
3740 (FM) or System/34 (MFM) diskettes.
On Tue, 25 Oct 2005, Allison wrote:
> 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.
Robotron for examples uses 128 bytes/sect. MFM so they have 26 sectors per
track on a 96 tpi DD 5.25" diskette and have the standard 8" FM sector and
track layout.
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.
I have several PCs and Multi I/O ISA controller cards that can do 128
bytes/sect. MFM. Watch out for the NatSemi DP8473 FDC.
Christian