Hello,
and thnx to everyone who responded! The closest answer for a rz26 came
from Chris Corcoran, although i still gor no information about the rz28.
Here it is:
* Front jumper block
  |       HDA
  +-------------------------  Pins Labeled 2 4 6 x 10 12 14 16 18 20 
    :::.::::::                             1 3 5 7  9 11 13 15 17 19
    012^^^^^^^
       |||||||
   scsi||||||+---- Spindle Sync (Pin 20 GND Ret (or 2 4 6) - Pin 19
SPINDLE_SYNC))
    id |||||+----- RESERVED
       ||||+------ AC Failure Notification (Pin 16 GND - Pin 17 AC_LOW)
       |||+------- Spin Delay (Jumper Installed Spin up at pwer on)
       ||+-------- +5VDC OUT (Pin 11) HIGH (used with remote Busy and
Fault LOW)
       |+--------- Spindle Sync Alternate  (Pin 10 SPINDLE_SYNC))
       |           Remote Busy  (Pin 9 BSY_OUT L)
       +---------- Remote Fault (Pin 7 FLT_OUT L)
* Termination
                    /------ Install both shunt jumpers
                    |       Drive will provide TERMPWR to SCSI bus and
                    |       Termination Resistors if installed on drive
                    V
  |                ::  |
  |    .----.----.---- | Termination Resistors
  +||||================+
  power scsi connector
  conn
 mit freundlichen Gruessen
          Reimund Willig
------------------------------------------
e-mail: willig.reimund_at_gdr.de
       tel: +49-5205-941747
      fax: +49-5205-941725
  ** Schwer ist leicht was **
-----------------------------------------
Received on Fri May 07 1999 - 11:59:11 NZST