Re: Apple IIc disk drive pinout confusion

[Kevin Dady <kevin@hackaday.com>]

On Dec 5, 2:42 am, Peltier Cedric <pcedr...@free.fr> wrote:
> Le 05/12/2011 05:04, Kevin Dady a écrit :
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> > Thanks all
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> > I hacked up a printer cable with a hacksaw and rewired it, the other
> > end is on a little breakout board I made, I was going to bus the 12v
> > connections together, and I am glad I second guessed it cause sending
> > +12 down a -12 line would have been real bad.
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> > Another question, maybe to save me a little bit of time, what voltages
> > do the stepper motor phases operate at? I will be getting the
> > technical manual tonight, but I have to do it in my sleep as I just
> > dropped to the lowest teir comcast service, and it makes downloads a
> > priority ... thus hosing any access for the entire house while
> > downloading anything, and a couple hundred megs takes a min at 1.5mbs
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> > I do plan on hooking all this up to "proper" test gear but my scope is
> > almost as old as the //c (1988) and thus does not save a huge amount
> > of info in its digital storage mode, and my LA is just a slapped
> > together AVR + software thing I would rather not send negative or
> > excessive voltages to as that would release the blue smoke from its
> > buffer chips (and of course a meter is not going to be very accurate
> > at the speeds these things run at).
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> > The info I have on hand is a photocopy of chapter 9 out of
> > "understanding the apple II" (minus page 9-7) and while it does a good
> > job in explanation its not 100% in its facts.
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> > Thanks again
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> As a quick response: signals on CA0, CA1, CA2 and LSTRB are 5V, but they
> are driving darlingtons and step motor receive 12V, if my memory isn't
> playing with me.
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> Cedric.

thanks