RX50 / RX33 Questions related to PDP-11's - test-drb@ccmp.vtda.org

15 Oct 1998

RX33's use a straight cable without the PC twist.  I have several here but
use only one at a time on my test beds.  I have several from various pieces
of DEC equipment and they all use the drive select jumpers with a straight
cable.
Dan Burrows
dburrows(a)netpath.net

-----Original Message-----
From: Tony Duell &lt;ard(a)p850ug1.demon.co.uk&gt;
To: Discussion re-collecting of classic computers
&lt;classiccmp(a)u.washington.edu&gt;
Date: Thursday, October 15, 1998 5:58 PM
Subject: Re: RX50 / RX33 Questions related to PDP-11's

...

 What exactly do your "RX33's" do
when you try to access them? 
 They flicker briefly just prior to the machine complaining it can't boot.
 I'm not sure I had them connected properly.  I'll try the method Allison
 suggested in a little bit. 
Do the drive spindle motors ever run? You can't read data from a disk
that's not spinning.

I am almost sure you need a cable without the PC-twist. Also, you
probably need to set the drive select jumpers properly (Can somebody tell
us what to?). Remember that the PC-twist not only swaps over 2 of the
drive select lines, it also gives separate motor on signals for the 2
drives.

-tony