Date   : Fri, 03 Apr 1981203:53:00-MST
From   : FONER@MIT-AI (Leonard N. Foner)
Subject: Floppy disk drive alignment disk needed

I have a disk drive for a TRS-80 Model I that recently got dropped
rather severely.  From a preliminary diagnosis, it appears that the
head is about (don't laugh!) one track or so out of *radial*
alignment...  not just azmuth misalignment.  This was a serious fall
or other shock, I assume (I was not there when the drive stopped
working.)

What I need to avoid paying Radio Shack a bundle to repair the drive
is the alignment disk that Radio Shack uses.  It is supposed to align
Shugart SA-400 disk drives, which is close enough to Radio Shack's
somewhat modified design, and is called the SA-124.  This is *not* a
disk diagnostic; it is rather a disk that has specially encoded
biphase pulses at tracks 0, 16, and 34, or something like that, that
is then used with an oscilliscope to position the head properly.

So, I need this disk rather badly.  Does anyone in the Boston area
have this disk that they could let me borrow?  Would anyone like to
buy it from me if I find a source to buy this from?  (I won't need it
when I finish with it, and I might as well resell it...)

Thanx for any help you can provide.

                                               <LNF>