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

26 Sep 2005

...
  -----Original Message-----
 From: cctalk-bounces at classiccmp.org 
 [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Allison
 Sent: maandag 26 september 2005 15:20
 To: cctalk at classiccmp.org
 Subject: RE: difference between LSI-11 CPU's M7264 and M7270

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!

   <------ 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 
Thanks Allison!
Together with the info from Pete I am on the safe side to turn on power.
BTW, I assume that you made a typo in the serpentine:
...
   option2|option1
  option3|option4
  option5|option6 That last line should be option6|option5, or ......?

73,
- Henk, PA8PDP.