[comp.sys.ibm.pc.rt] Switches on RT E70 drive

zeeff@b-tech.ann-arbor.mi.us (Jon Zeeff) (01/16/91)

I'm in the process of adding a second and third E70 drive to a IBM-RT running
4.3 bsd.  I made a straight through 34 pin cable that goes to all the
drives.   The problem seems to be in how to set the switches on the drive
(drive select) to work properly.

IBM recommends (for their twisted cable):
  Internal
  Installation
  ----------
  |Off  On |
1 | X      |
2 |      X |
3 |      X |
4 | X      |
5 |      X |
6 | X      |
  ----------

I find that this works for the first drive (with my no twist cable):

  Internal
  Installation
  ----------
  |Off  On |
1 | X      |
2 |      X |
3 |      X |
4 |      X |
5 | X      |
6 | X      |
  ----------

I have no idea how to set the switches for the second and third drive.  My
guess of 
  ----------
  |Off  On |
1 | X      |
2 |      X |
3 |      X |
4 | X      |
5 |      X |
6 | X      |
  ----------
for the second drive didn't work.

Can anyone explain the 6 switch positions and what they do and how I should
set them?  Thanks.

-- 
Jon Zeeff (NIC handle JZ)	 zeeff@b-tech.ann-arbor.mi.us