19 Nov
2009
19 Nov
'09
5:06 p.m.
dwight elvey wrote:
I would suspect that you want to have a way to
select
any number of sectors index holes.
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
* ^
Where * is the point where the HSTMD detector triggers, and I is the
index pulse.
The start and stop detectors are almost identical -- the only difference
is which register set the configuration is sourced from.
Still, at least I have an upper bound now. 32 sectors it is!
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/