Date   : Fri, 08 Jun 1990 10:06:09 PDT (Friday)
From   : Sprague.WBST311@Xerox.COM
Subject: Daisy Chaining XEROX 820-2 Drives

For some reason, I could not send directly to Steve Westlund, so I am
sending this reply to the whole group.


> I would like to daisy chain an 8-inch floppy drive unit to the
> 8-inch rigid drive connected to my XEROX 820-2.

I too have wondered how to do that, but do not know how to do it (yet).  It
is not addressed in the Xerox 820 Technical Reference manual at all.  I
will forward your message on to the 820 Users Group dl here at Xerox.
There are some new members, and maybe one of them knows.  Send me your
Email address.


> Can I modify a XEROX 820-2 to work with another type of drive by simply
> swapping the baby boards, or is there more to it?

As to the 820-II daughter boards, I am not sure what your getting at, but
there is one daughter for the rigid drive, and one for 8"/5" floppy disk
drives.  Swapping back in forth is as simple as plugging them in and
attaching the correct drive.  Just *DON'T* get them mixed up (Drive and
card).  You *WILL* blow the hard drive controller board inside the drive
cabenet if you attach it to the Floppy controller daughter board, and they
are damn near impossible to replace.

If you need a floppy controller daughter board, let me know.

                               ~ Mike
                               (Sprague.Wbst311@Xerox.Com)