pdp11/70 / MK11

From: Erik Brens <blergh_at_dds.nl>
Date: Thu Apr 6 14:44:36 2000

Hi Tim,

On Thu, Apr 06, 2000 at 02:57:32PM -0400, CLASSICCMP_at_trailing-edge.com wrote:
> > but I was wondering if there
> >is another way, possibly involving standard UNIBUS memory.
>
> I do believe that there's an option to map some of the memory space on the
> Unibus into memory space. It probably doesn't work correctly at all if
> you're using the Massbus slots for I/O, though, and you certainly can't
> get above 124 kWords doing this.

Do I need a special module to do this, or can it be done by some modest jumpering/rewiring ?

At the moment I would be happy to just have a semi-working 11/70, however I would love to have it fully functional someday.

> Out of curiosity, why can't you use your MK11's? Not enough power to
> run them and the 11/70 at the same time? I had to take multiple 15A
> circuits to run my 11/70 with MJ11 memory boxes.

The 11/70 was defunct when I got it, and a week ago I finally managed to diagnose the problem to be "MK11 related". (after reseating all connectors coming out of the MK11 the 11/70 actually worked for about 5 minutes)

I was about to clean and reseat all connectors today, but when I turned on the 11/70, something at the back of the MK11 short circuited .....

I only have one MK11 box with 768KB of ram, and I can only hope the modules contained herein weren't damaged.

        Erik.
Received on Thu Apr 06 2000 - 14:44:36 BST