difference between LSI-11 CPU's M7264 and M7270 - test-drb@ccmp.vtda.org

26 Sep 2005

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Subject: RE: difference between LSI-11 CPU's M7264 and M7270
   From: "Gooijen, Henk" <GOOI at oce.nl>
   Date: Mon, 26 Sep 2005 13:42:48 +0200
     To: "'General Discussion: On-Topic and Off-Topic Posts'"	<cctalk
at classiccmp.org>

Thanks Pete.
I had a look at the backplane yesterday, but did not see an Hxxxx number.
There was a xx-yyyyy (?) digit number, but I will check again this evening. 
That number may be cross referenced to a Mxxxx number.  Most likely M9270
as that was common use for the BA11M based LSI-11/03 system package with 
H780 PS.  The H780 carries two fans and is known to sing (high pitch 
whistle) and that is most recognizable!

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   <------ M7270 ------> <------ M8044 ------> ==================
   <------ empty ------> <------ M7940 ------> |  o o  __ __ __ |
   <------ empty ------> <------ empty ------> |       ~~ ~~ ~~ |
   <------ empty ------> <------ empty ------> ================== 
usual config is: 
  M7264 (quad)
 option2|option1
 option3|option4
 option5|option6

Others:
  M7270 |M8044
 option2|option1
 option3|option4
 option5|option6

Option1 is typically DLV11 (SLU)
option2 is typcailly DLV11 (SLU#2)
option3 is typically RXV11 (floppy)
option4 is typcically REV11 (floppy boot prom)

It is also possible to use core (MMV11-A) in this system but
it leaves limited space for serial or disk interfaces.

...
 The figure is as seen from the front side when the
front cover is removed.
The "art work" shows the panel with the switches and LEDs at the right.
To remove a board from the cage you must pull the board "out of the
screen", so the magenta handles are at the front side.

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. 
M7264 and M7270 are identical CPUs (LSI-11 chipset aka KD-11F) with the differnce
that the M7264 has 0 to 4k of local ram on the card.  Bus usage is identical and
they are 16bit address (Q16).

...
 It makes perfect sense that I will have to adjust the
base address of
the memory on the M8044 if I install the M7264.  I will take an other
look at the memory board with the new information from you.
I will dig up the MicroNotes! 
Correct.  Note: M8044 can have variable population of ram and there 
are varients for sizes from 4KW (W is 16bit word) to 32KW.  the board
also carried parity is some versions.

M8044-AA 4k no parity  MSV11-DA
M8044-BA 8K no parity  MSV-11DC
M8044-CA 16K no parity MSV11-CA
M8044-DA 32K no parity MSV11-DD
M8045-DA 32k Parity    MSV11-ED

...
 It will be interesting to see what the system does when
I power it up.
The console is connected to the M7940 ... I hope to see a prompt! 
Base DLV-11 SLU, make sure the addresses and vectors are setup as console.
(177560rx, 177564 tx, v60rx,V64tx)  nominal baud rate could be anything 
...
 from 110-9600.  Common baud used was 300, 1200 and
9600. 
...
 Regarding the M8018 WCS option: is this
"just" a chip, like FIS or the
big CIS one? I thought it was a board (module) as the M number suggests.
Anybody here has a M8018 WCS and can tell more about it? 
It'a a board of quad width.  Power for the board comes off the bus but
it's signals are a cable to one of the LSI-11 microm sockets (40 pin).
Besides acting as programable microcode store there are IO registers 
to allow writing and reading the ram content as well as mapping where 
the code store appears in CPU microcode address map.

Allison