david at hheng.plus.com
Wed Jan 7 06:40:50 CST 2015
Also the selection method is different between pdp8 and the 11, one used 1
of n and the other 3 binary digits, cant remember which is which but do
remember I had a bit of a fiddle getting my ex 11 drive to correctly select
on my 8.
----- Original Message -----
From: "Ian S. King" <isking at uw.edu>
To: <marc.howard at ieee.org>; "General Discussion: On-Topic Posts"
<cctech at classiccmp.org>
Sent: Wednesday, January 07, 2015 12:58 AM
Subject: Re: Resurrecting RK05
> Keep in mind that the drive has an internal selector for drive number.
> Something tells me that a competition between two drives would not be a
> pretty thing.
> On Tue, Jan 6, 2015 at 1:36 PM, Marc Howard <cramcram at gmail.com> wrote:
>> I would definitely replace the foam around the squarish tube that
>> air to the pack. That's the worst place for a foam particle to break
>> On Tue, Jan 6, 2015 at 10:59 AM, tony duell <ard at p850ug1.demon.co.uk>
>> > >
>> > > I am also wondering, that since I have very few PDP8-sectored RK05
>> > packs, and a ton of PDP-11 sectored
>> > > packs, if , when I first power up the drive after it has been
>> > up to the RK8E , I can put one of my PDP 11 > packs in there and spin
>> > it
>> > up, if the controller will be able to load the heads? I'd much
>> > rather
>> > sacrifice one of
>> > > these packs if there are problems rather than risk one of my precious
>> > PDP-8 sectored packs.
>> > An RK05 will spin up and load the heads without a controller. It is a
>> > good idea to have a terminator
>> > fitted (otherwise noise on the interface lines can do interesting
>> > things,
>> > like cause write glitches, don't ask
>> > how I found that out).
>> > It does need a pack with the slotted hub so that the drive electronics
>> > tell the drive is up to speed before
>> > it tries to load the heads. But obviously a 12 sector (PDP11) pack will
>> > for that.
>> > So yes, you can use a PDP11 type of pack to see if the heads will fly
>> > though the drive is on an RK8/E
>> > -tony
> Ian S. King, MSIS, MSCS
> Ph.D. Candidate
> The Information School
> University of Washington
> An optimist sees a glass half full. A pessimist sees it half empty. An
> engineer sees it twice as large as it needs to be.
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