[sebhc] Making hard sectored disk

Dwight K. Elvey dwight.elvey at amd.com
Wed Jun 30 12:34:09 CDT 2004

>From: "Steve Thatcher" <melamy at earthlink.net>
>Hi Dave, I was not contemplating modification of the drives and I also wanted 
to make the device work on any hard sector system. N* uses HS and not HM for 
example (I have both N* and H88 systems...).
>best regards, Steve Thatcher
>-----Original Message-----
>From: Dave Dunfield <dave04a at dunfield.com>
>I guess I was not clear - I think it would be best to modify the drive so
>that these signals are available to our adapter even when the drive is
>deselected. If you use the traditional "Motor ON" control line instead of
>the "Motor on select", you can keep the drive running even when it's not
>selected - by attaching to the index sensor BEFORE the drive select logic,
>we should be able to read it even if the drive is deselected.
>As for the index output - you would have to gate that externally with select
>anyway because we have to generate pulses that the drive does not generate,
>Again if you were modifying the drive, you could do this by injecting the
>additional sector pulses BEFORE the drive select logic.

Hi Steve
 I am in the process of doing this( when I get around to it ).
I have a gutted SA400 that will work nicely. Making a punch
is not all that hard. I intend to mount part of the punch
on the frame and the other part on the hinged piece that
holds the disk. I'll be putting detents on the pulley/flywheel
that will locat for the holes. The holes are about .100 inches
in diameter. There is a drill size that is almost exactly this
size ( I forget which ).
 I have one of those Shearline lathes so I should be
able to make the needed pieces. I also have the mill attachment.

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