The drive works perfectly for double sided disks (using the
appropriate index hole).
Yea, 8" drives are a bit funny like that.
You know this, because context. Some future google-ologist might not.
So. 8" drives have a different index position for SS and DS.
In your case I suspect either
I haven't worked on 8" drives since the early 80's with th exception of
the RX02 drives on my PDP-8.
And DEC worked their own "magic" on those drives :)
Thanks for the help.
On 1/31/2024 3:59 PM, Chuck Guzis via cctalk wrote:
On 1/31/24 13:03, Mike Katz via cctalk wrote:
Michael,
Thank
I believe the pull ups are all on inputs from the external controller
and not for outputs from the drive itself. Looking at the schematic the
Index output (J1-P20) does not go through the pull up resistors.
Thanks again for your help.
On 1/31/2024 3:59 PM, Chuck Guzis via cctalk wrote:
On
On 1/31/24 13:03, Mike Katz via cctalk wrote:
> Michael,
>
> Thank you, that was what I was planning as my next step. I haven't
> checked to see if the service manual has a full schematic.
>
> The main purpose of my message on here was to see if I was missing
> something obvious like an option
That is one of the tests recommended in the service manual. It's on my
list of things to check.
Thank you...
On 1/31/2024 2:17 PM, Chuck Guzis via cctalk wrote:
On 1/31/24 11:12, Mike Katz via cctalk wrote:
I have not yet tried installing terminating resistors...
That might help. It's
Michael,
Thank you, that was what I was planning as my next step. I haven't
checked to see if the service manual has a full schematic.
The main purpose of my message on here was to see if I was missing
something obvious like an option trace cut or something like that that I
missed when I
On 1/31/24 11:12, Mike Katz via cctalk wrote:
> I have not yet tried installing terminating resistors...
That might help. It's also possible that the LED/phototransistor for
the SS index position is faulty. The two LEDs (SS and DS) are connected
in series, so you know that at least one isn't
Connect an oscilloscope to the output of the single-sided sensor and see if
it works. If so, trace the signal through the logic and see if it gets to
the I/O connector that goes to the greaseweazel.
On Wed, Jan 31, 2024 at 2:38 PM Mike Katz via cctalk
wrote:
> I have recently acquired a Qume
