was :-( , now :-) Re: PDP-11/05 with RX02 :-( - test-drb@ccmp.vtda.org

9 Mar 2000

-----Original Message-----
From: Tony Duell &lt;ard(a)p850ug1.demon.co.uk&gt;
To: classiccmp(a)classiccmp.org &lt;classiccmp(a)classiccmp.org&gt;
Date: Thursday, March 09, 2000 2:54 PM
Subject: Re: PDP-11/05 with RX02 :-(

...
 >
> I can't find my book on the M8256 (RX211) so I don't know if the switches
> are set right.
>
> I have a PDP-11/05 here that works fine and boots up RT11 or XXDP on an RX01
...
 > with an RX11. When I replace the RX01 system with
an RX211 and an RX02 and
...
 > try and boot RT11 the CPU hangs up at:
>
> 173546 , run light on. Requires a full reset to clear.
>
> I have tried other RX211s, RX02s, and cables and the same problem occurs.
>
> The disk is being accessed for a little while (4 or 5 "clicks") and
dies....
...

A few quick things to check :

1) You are trying to boot an RX02 version of RT11, not an RX01. While the
RX02 can read/write RX01 disks, the RX211 and RX11 need rather different
software to drive them, so an RX02 can't _boot_ a bootable RX01 disk.

I know. I was trying RX02 RT11v4. BL

...
 2) You've got the DIP switch in the RX02 (on the
upper, controller,
board) set correctly. I'm pretty sure that how to set this is on the web
somewhere, but if you can't find anything (and nobody else beats me to
it), I'll try to find the fine manual.

I guess so. The RX02s are from LSI systems.

...
 3) The RX211 is a DMA (NPR) device. 
You just said the magic words! I have never been blessed with a RX211 before
(always big drives or RX01s). Many thanks for saving me hours of going
through boxes to find out it was a NPR device. Thanks again.

<very happy PDP-11/05 systems now>

john

PDP-8 and other rare mini computers

http://www.pdp8.com

...
 You need to cut the jumper between
pins CA1 and CB1 on the backplane of the slot where the RX211 is
installed. That's the most likely problem if you've just pulled an RX11
and replaced it by an RX211.

...
 -tony