Subject: RE: difference between LSI-11 CPU's M7264 and M7270
From: "Gooijen, Henk" <GOOI at oce.nl>
Date: Mon, 26 Sep 2005 15:37:11 +0200
To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk
at classiccmp.org>
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)
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 ......?
As shown it is correct. 2,3,5 on the left: 1,4,6 on the right.
it's one of the odder -11 backplanes. I believe the reson for that
odd layout is when cascading multiple boxes (BA11M) the cables
orient easier as option 5 to next box topleft is the shown
configuration and the REV-11 prom boot is nominally in option6
as bus grant continuity is not required for most memories.
My source was the Microcomputer handbook 1976/77.
I also have one with core in it.
Allison