RX50 / RX33 Questions related to PDP-11's

From: Daniel T. Burrows <dburrows_at_netpath.net>
Date: Thu Oct 15 18:38:12 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_at_netpath.net

-----Original Message-----
From: Tony Duell <ard_at_p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
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
Received on Thu Oct 15 1998 - 18:38:12 BST

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