10 Jun
2013
10 Jun
'13
5:31 p.m.
On Jun 10, 2013, at 5:10 PM, Philipp Hachtmann <hachti at hachti.de> wrote:
Yes, as the index slots are fairly easy to identify. With that and knowing the original
number of slots
it should be easy (and fairly accurate) to regenerate the number of slots (sectors) that
you wanted.
Yea, it's one of those things and I'm happy to have the 16 sector packs that I do.
I also have a number of
the "red" alignment packs.
I've been disassembling, cleaning, inspecting the 12 sector packs and I've had
some fallout (~5-10%) but those
have been the nasty/dirty packs (about 1/2 of them). The others are clean so I suspect
the fallout rate on those
will be much lower.
TTFN - Guy
Hi Guy,
I don't think we ever came to a conclusion. ;-)
This has been discussed at length among us DEC
folks here in the SF Bay area.
And with which conclusion? One idea that's kind of neat
(I think it was Eric Smith who first mentioned it) was use insert a PLL between the
optical sensor circuit and the
controller that would allow you to specify the number of sector pulses that gets sent to
the controller.
I once thought about that, too. Don't remember if I was
inspired by some posting somewhere. It would be quite easy. A $2 AVR with a crystal
oscillator would to the job as well. Then you would only need a switch for the number of
sectors. One prerequesite for this "virtual sectoring" would be a good stability
of the disk rotation speed.
With a microcontroller you could also resynchronize the software PLL with the original
index slots. That would make the thing even more accurate!
So, new question: Would there be any interest in a little circuit that can be added to
any RK05 drive?
What we talked about was doing something so that the drive can be turned back to original
condition
fairly easily.
As an aside, I'm in about the same boat. I
have 4 16-sector packs and 200-300 12 sector packs.
Hundreds and only four? I have
about 15 16-sector packs. And less 12 sector packs. But as I wrote - there's 12-sector
pack supply...