The Last of The Line - test-drb@ccmp.vtda.org

21 May 2007

Hi
There seems to be some differing views as to how the boards would be
arranged in an 11/94 to use 11/84 CPU Board and memory.
I'll describe the 11/94 box I have. 
The box has label saying 11/94-EF 
The first three slots in the first nine slot backplan  have four edge
connectors. 
In the space where the other two edge connectors would have been are IDC
connectors for ribbon cables going to the front panel.
The rest of the slots (6) in first nine slot backplane have six edge
connectors.
The second nine slot backplane has nine slots with six edge connectors
in each.
The forth slot has the M8191 Unibus controller in it. 

The main discussion seems to be which comes first the cpu or the memory.

There is also an issue around, are the first three slots a Q-Bus or not?

Currently my understanding is any M8190 CPU and any M8637 memory

So Slot one: 
		 M8190       
 	       Or   		
		 M8190-AB   15Mhz
             Or 
		 M8190-AE   18Mhz

   Slot two/three 

		MSV11-JD    (1Mb) x 2
 		or

		MSV11-JE    (2Mb) x 2

So can we get to a consensus as to which boards in what order are known
to work?

Rod Smallwood

-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Johnny Billquist
Sent: 20 May 2007 20:14
To: cctalk at classiccmp.org
Subject: Re: The Last of The Line

Pete Turnbull <pete at dunnington.plus.com> skrev:

On 20/05/2007 03:22, Jerome H. Fine wrote:
...
 > > I have also read that the MSV11-JD and
MSV11-JE boards should NEVER  >> > be used together.  Can anyone else
confirm or deny this?
...

 No reason not to, except that you'd end up with an unusual amount of
 memory (3Mbytes).  It certainly won't hurt anything, though of course
 you would need to set the start address of the lower board to the  > correct
value.  It's settable to any 16KB (8KW) boundary.

What do you mean "unusual amount"? I've been running one 11/83 like that
for the last two years until today actually, when I upgraded to 4 megs.
:-)

I used to run my 11/84 like that as well. Currently it's shut down. 
Haven't had time to organize my computer room after I moved, so it just
sits there...

...
 > > I suspect that 3 * MSV11-JD boards may be
used in a BA123 box with 4  >> > ABCD slots, but since I don't have any
MSV11-JD boards, let
alone 3  >> > of them, I can't verify this.
...

 I don't recall ever trying *that*, but it too would work, so long as you  >
set the start address of each board correctly, and again you'd
end up  > with 3Mbytes, which is an unusual amount.  The manual just
says you can  > use "one or more MSV11-J memory modules", without
mentioning size or  > maximum number.

3 megs "unusual"? Hah! ;-)

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol