4 Mar
2011
4 Mar
'11
11:17 a.m.
The index on
an 8" HS floppy is located midway between two sector
holes. So, for example, if you use a one-shot whose output width is
set to, say, 2/3rds of the time between index holes, any hole
occurring under that "umbrella" must be an index--so you generate an
"index" pulse. Very simple, actually.
Ah... I see now. The one-shot is used as a gate and if another index
pulse comes in while the gate is "open", then you let that pulse pass.
Thanks. Makes sense.
This should apply to 5.25" hard-sector too. Same concept.