19 Nov
2009
19 Nov
'09
5:24 p.m.
On 19 Nov 2009 at 16:06, Philip Pemberton wrote:
It essentially already has this feature -- it's
called HSTMD+Index.
The controller waits for the track mark (index pulse between two
others), then after it's seen said TM, it waits for the next index
pulse. Like this:
I I I I I I
* ^
The 8" case is a bit different. Because of the near-universal use of
32-sector disks for hard-sectored data, you want a way to ignore
every other, or the next consecutive 3, or 7, or 15 sector holes, for
16, 8, 4 and 2 sector formats respectively.
I don't know if any 5.25" formats use this sector-hole skipping
scheme.
--Chuck