RX01 Bootstrap Loader - test-drb@ccmp.vtda.org

12 Feb 2000

-----Original Message-----
From: CLASSICCMP(a)trailing-edge.com &lt;CLASSICCMP(a)trailing-edge.com&gt;
To: classiccmp(a)classiccmp.org &lt;classiccmp(a)classiccmp.org&gt;
Date: Saturday, February 12, 2000 11:07 AM
Subject: Re: RX01 Bootstrap Loader

...
  Due to the
instruction set incompatibilities between the 11/20 and other
11s, will they even run RT11 V30B with 8K core? 
RT11 V03B ought to be OK, as long as you have enough memory.  I know that
12K words core is enough (I have V03B on an 11/04 with 12K core), I suspect
it will fit in 10 or 8K. 
The monitor only uses 2K core and expects 8. (SJ).

...

If you try to run RT-11 5.5 or 5.6 on an 11/20, you'll get some complaint
because EIS instructions found their way into a few utilities and drivers.
This has been rectified for 5.7; see the 5.7 release notes for details.

I am more concerned about the incompatibilities in the basic instruction
set. I am going to try boot RT11 V3B. If not, I'll try plain ver 3, then
maybe 2.

I know DEC discontinued the 11/20 in '73 which was during the initial
development of the OS's.

john

PDP-8 and other rare mini computers

http://www.pdp8.com

...
 --
 Tim Shoppa                        Email: shoppa(a)trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd    Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927