Kevin Dady

I need to know the pinout's to the apple IIc external drive connector,
but there is some confusion

according to apple, pin 5 is +12 volts

http://support.apple.com/kb/TA30794?viewlocale=en_US

according to A2Wiki its -12 volts
http://apple2.info/wiki/index.php?ti..._cable_pinouts

which is correct?

Steven Hirsch

On 12/04/2011 07:44 PM, Kevin Dady wrote:
> I need to know the pinout's to the apple IIc external drive connector,
> but there is some confusion
>
> according to apple, pin 5 is +12 volts
>
> http://support.apple.com/kb/TA30794?viewlocale=en_US
>
> according to A2Wiki its -12 volts
> http://apple2.info/wiki/index.php?ti..._cable_pinouts

I believe it is actually -12V, but please verify that with a meter before
taking the risk of damaging something :-)

David Schmidt

On 12/4/2011 7:44 PM, Kevin Dady wrote:
> I need to know the pinout's to the apple IIc external drive connector,
> but there is some confusion
>
> according to apple, pin 5 is +12 volts
>
> http://support.apple.com/kb/TA30794?viewlocale=en_US
>
> according to A2Wiki its -12 volts
> http://apple2.info/wiki/index.php?ti..._cable_pinouts
>
> which is correct?

Looking at the Apple IIc hardware reference volume 1 from 1000bit.it,
page 282 says pin 5 is -12v.

Bill Garber

"Steven Hirsch" <snhirsch@gmail.com> wrote in message
news:67ydnYBWfeHGukHTnZ2dnUVZ_v-dnZ2d@giganews.com...
> On 12/04/2011 07:44 PM, Kevin Dady wrote:
>> I need to know the pinout's to the apple IIc
>> external drive connector, but there is some
>> confusion
>>
>> according to apple, pin 5 is +12 volts
>>
>> http://support.apple.com/kb/TA30794?viewlocale=en_US
>>
>> according to A2Wiki its -12 volts
>> http://apple2.info/wiki/index.php?title=Pinouts#3.5_
>> in._and_5.25_in._Drive_cable_pinouts
>
> I believe it is actually -12V, but please verify that with
> a meter before taking the risk of damaging something :-)

Pin 5 is definitely -12 volts.

Bill

Kevin Dady

Thanks all

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.

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

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).

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.

Thanks again

Peltier Cedric

Le 05/12/2011 01:44, Kevin Dady a écrit :
> I need to know the pinout's to the apple IIc external drive connector,
> but there is some confusion
>
> according to apple, pin 5 is +12 volts
>
> http://support.apple.com/kb/TA30794?viewlocale=en_US
>
> according to A2Wiki its -12 volts
> http://apple2.info/wiki/index.php?ti..._cable_pinouts
>
> which is correct?

From all references I have, pin 5 is -12V, pin 6 is +5V, and pin7 is
+12V. I have checked them on my own Apple 2c.

Cedric.

Peltier Cedric

Le 05/12/2011 05:04, Kevin Dady a écrit :
> Thanks all
>
> 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.
>
> 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
>
> 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).
>
> 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.
>
> Thanks again

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.

Cedric.

Kevin Dady

On Dec 5, 2:42*am, Peltier Cedric <pcedr...@free.fr> wrote:
> Le 05/12/2011 05:04, Kevin Dady a écrit :
>
>
>
>
>
>
>
>
>
> > Thanks all
>
> > 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.
>
> > 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
>
> > 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).
>
> > 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.
>
> > Thanks again
>
> 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.
>
> Cedric.

thanks