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From: mas@genrad.com (Mark A. Swanson)
Newsgroups: comp.realtime
Subject: Re: RSX -- one of the best?
Summary: Lack of connectivity & address space limit RSX
Message-ID: <41618@genrad.UUCP>
Date: 23 May 91 15:39:18 GMT
References: <22847@shlump.lkg.dec.com>
Sender: news@genrad.UUCP
Distribution: comp.realtime
Organization: GenRad, Inc., Concord, Mass.
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Yes, RSX is a nice operating system for problems it can handle, which are
a constantly declining part of those in our problem space.  The
old problem with it is the PDP-11's limited address space.  I have spent
far too many weeks cramming "10 pounds into a 5 pound bag" to voluntarily
use it again for any of the problems I deal with. (Most involve some
computation tasks which needs to run on the same CPU as the real time
application.  64kbytes does not cut it.  The need for such computation
tasks explains why RSX rather than a simple real time kernel got used.)

However, the killers for our use was the fact that RSX had no support for
TCP/IP (and for quite a while little for Ethernet), and poor C compilers
which made it difficult to work with in the context of larger systems.  

	Mark Swanson