On 8/30/2017 12:10 AM, Ethan Dicks wrote:
On Tue, Aug 29, 2017 at 10:52 PM, Douglas Taylor via cctalk
<cctalk@classiccmp.org> wrote:
I have a BA11-M box with a backplane that I am sure has been upgraded to be
22 bit addressing.
If you send me a picture of the backplane part of the box (without the
outer shroud), I might be able to help. I think I have some 4x4 Qbus
backplanes, which are likely to be Q16 or Q18 not Q22 that have no box
but may be the former contents of a BA11-M. I know they aren't part
of a BA11-N, because I have 2 of those that I use with RLV11s. The
paper tag on the backplane says "LSI-11" (the type of tag that might
say DD11-CK or DD11-DK when applied to those backplanes).
If so, does anyone have spare MSV11-DD 64kb memory and DLV11 type serial
cards for sale/trade?
I think those cards are easy to find. Among the most common Qbus
cards. I have some, as do others on this list.
-ethan
I'll send along a picture of the rear of the back plane. I'm getting
the impression I can't do what I want with the old cpu cards, M7270 and
M7264.
I had really hoped to be able to put together a simple system to
demonstrate the differences in processing power between the 11/2 cpu,
the 11/23 and the 11/73.
They are all dual width cards and it would have been simple to swap them
out. I think to do it I would need 2 boxes, one with a 16 bit backplane
and the other with a 22 bit backplane.
