(no subject) - test-drb@ccmp.vtda.org

27 Sep 2005

...

Subject: (no subject)
   From: Frank Arnold <fm.arnold at gmx.net>
   Date: Tue, 27 Sep 2005 15:24:06 +0100
     To: cctalk at classiccmp.org

Message: 28
Date: Mon, 26 Sep 2005 13:42:48 +0200
From: "Gooijen, Henk" <GOOI at oce.nl>
Subject: RE: difference between LSI-11 CPU's M7264 and M7270

> -----Original Message-----
> On Sep 26 2005,  8:40, Gooijen, Henk wrote:
> 
> 
> >    <-- M7270 -LSI11/2--> <--- M8044 MSV11----> ==================
> >    <------ empty ------> <--- M7940 DLV11----> |  o o  __ __ __ |
> >    <------ empty ------> <------ empty ------> |       ~~ ~~ ~~ |
> >    <------ empty ------> <------ empty ------> ==================
> > 
Henk, there is no bootstrap in this system....

The FieldGuide says that a few lines are used for something else, but
I expect (hope) that the M7270 and the M7264 usage of all connections
is identical. 
No, I think only the LSI11 suplies refresh to the bus, LSI11/02 does not.
They use some of the sspare lines for that, that much later got used for
Adressbits 19-21 once Q-bus got Q22 
Correct on refresh, the 7270 does not provide it (not needed for 8044 memory).
However, the unused microcode lines are not used for refresh.  Those are
use for special (unimplmented) microcode. 

...
  Regarding the
M8018 WCS option: is this "just" a chip, like FIS or the
big CIS one?  
Those are LSI11/23 options... 
The M8018 KUV11-AA is for the M7264 (LSI-11, KD11-f), I have also tested 
it with M7270 (LSI11/2)(sort of a hack).

There was a microcode WCS option for the 11/23.  It is also a board. I 
don't think it was ever sold.  There was a FPU option M8188 (FPF11) 
a quad width board for the 11/23 that was sold.

...
 Unfortunately I dont have this (still hunting), but
yes, I is a board. It
takes only the power from the Q-bus and connects with a flatcable to the
microm socket on the LSI-11 module. 
I also heard the fact that this works (or was DEC-supported) only on the
quad LSI11, but can't see a good reason for this, as the chipset is
identical. It even has the empty socket to connect the WCS-option.
Maybe the engineering drawings will tell more. 
It was design specific for the M7264-YC though it seemed to work with 
any of the M7264 or M7270 modules (microcode address specific caveat).
The DEC supported config was on the M7264-YC. The difference is that 
each microm socket has a unique microcode address and is diagnostic 
specific.

Allison