Date   : Tue, 19 Apr 1988 11:25:03 PDT
From   : rzh@freedom.llnl.gov (Roger H. Hanscom (415) 423-0441)
Subject: Help with Shugart 801 Drives??

  A few weeks ago, I became the proud(?) owner of 2 Shugart 801's.
They look to be in fine shape, and I'd like to use them on a Xerox
820-1 that I have kicking around.  Trouble is, there is no manual,
and I'm more used to Siemens or Qume 8" drives.  The select lines
on the drive are pretty obvious, but some of the others are not
so.  Will somebody please explain??  Below is a representation of
the connector, showing the jumpers that were on the two drives
and my assumption as to what WAS drive A and B.  What are the
T jumpers --- some kind of termination??  What are D, C, I, R, and
S???

                |
                |               jumpered (A drive??)      (B drive??)
         /^^^^^^^ 2
         |xxxxxx--------o
         |xxxxxx--------o
         ======+   (notch)
         |xxxxxx--------o
         |xxxxxx--------o
         |xxxxxx--------o
         |xxxxxx----------o o
         |xxxxxx____DC__o
         |xxxxxx__________o o
         |xxxxxx____D_____o o           x                     x
         |xxxxxx____C_____o
         |xxxxxx____I_____o o
         |xxxxxx____R_____o
         |xxxxxx____S_____o o o o
         |xxxxxx____DS1___o o           x
         |xxxxxx____DS2___o o                                 x
         |xxxxxx____DS3___o o
         |xxxxxx____DS4___o o                                 x
         |xxxxxx____T3____o o                                 x
         |xxxxxx____T4____o o                                 x
         |xxxxxx____T5____o o                                 x
         |xxxxxx____T6_______
         |xxxxxx-------------
         |xxxxxx-------------
         |xxxxxx-------------
         |xxxxxx-------------
         \------i  50
                |


My newer 8" drives only require +24v ( on 1 & 2 - forgot which is 
ground or "return") and +5v ( on 5 & 6 ).  Don't these guys require
-5v ( on 2 & 3 )??  If so, which is -5v and which is ground??

                      -------------------
                      |  1     3     5  |
                      -----  ------------
                          |  |
                          |  |
                          |  |
                      -----  ------------
                      |  2     4     6  |
                      -------------------

Any help/comments are welcome. Thanks.

Roger Hanscom
rzh%freedom.llnl.gov@lll-lcc.llnl.gov