cctalk Digest, Vol 75, Issue 39
ball.of.john at gmail.com
Tue Nov 24 09:37:43 CST 2009
>My expeirience is that if you have a drive with a correctly-aligned
>positioner/head assemly, you can remove it as an assembly, and put it
>back in _the same drive_ and it will still be alighed. But if you move
>positioenrs between drives you have to do a realignment.
In my case unfortunately that would not be the case as the best I can find
are two other units in unknown condition from a completely different set of
>The alignment procedure is not hard if oyu have the alignment pack. You
>also need a 'scope (but just aout any 'scope will do) and a way of moving
>the heads to a particular cylinder and selecting head 0 or head 1. I had
>no prolems using a PDP11 + the appropriate controller for this, just
>togging values int oteh controller registers from the PDP11's font panel.
>If you use a PDP9/e, I think you have to write a trivial program for this.
I can easily get hold of a scope but a calibration pack is a different
>THe disk packs are different between the PDP8 and PDP11 systems. They're
>hard-sectored (by notches in a metal ring on the disk hub), PDP11 packs
>are 12-sectory, PDP8 packs are 16 sector. The former are _much_ easier to
I think if I could find the rest of the system I might also find the packs
as well. Since this was a local and very little known recycling job only a
few businesses in town and university staff drop stuff off. I really wish I
knew dropped this off but alas, no records are kept on who drops off what.
My best bet is either the hospital or it came from someplace in the
university. Where exactly I have no idea.
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