Advice wanted on Kennedy 9600 and PDP11/23

From: Richard Erlacher <edick_at_idcomm.com>
Date: Tue Jul 6 10:34:56 1999

I have what claims to be an IBM master alignment tape. I haven't looked at
it in detail in over 20 years, but I just saw it yesterday. Is this
somehing you (or all of you) could use?

Dick
-----Original Message-----
From: Jay West <jlwest_at_tseinc.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Tuesday, July 06, 1999 9:28 AM
Subject: Re: Advice wanted on Kennedy 9600 and PDP11/23


>Now that my TC02 is re-installed, it won't work at all. The select light
>never comes on. ARGH!!! I'll fiddle with it later today since I'm off work.
>
>If I can't get it working, would anyone be willing to convert some 800bpi
>tapes to 1600bpi for me? The tapes are the initial load tapes for
>HP2000Access (Timeshare BASIC). My 7970E doesn't speak 800bpi, so I need to
>convert them. Of course, the tapes are priceless to me <grin> so I'm loath
>to send them out, but they are useless at 800bpi.
>
>On the other hand, I was wondering about what is involved in making my
7900E
>read 800bpi? ISTR that different heads are needed - which it too much
>modifications to me. GRrrrr....
>
>>It takes a master alignment tape, a scope, and a resistor network that
sums
>>the outputs from the tape channels. The master alignment tape has
>transitions
>>that are supposedly well-aligned between all channels, and you tweak the
>>head until you get a nice pattern on the scope. I can fax you a few pages
>>from drive maintenance manuals on the procedure if you're really
>interested.
>
>
>Well, I have the scope (20mhz ok?), but no alignment tape or resistor
>network.
>
>Thanks in advance for all the help!
>
>Jay West
>
Received on Tue Jul 06 1999 - 10:34:56 BST