Path: utzoo!attcan!uunet!mcrware!mwca!bill
From: bill@mwca.UUCP (Bill Sheppard)
Newsgroups: comp.realtime
Subject: Re: Survey of Commercial Real-Time Operating Systems II
Message-ID: <1693@mwca.UUCP>
Date: 13 Aug 90 16:56:02 GMT
References: <3036@zipeecs.umich.edu>
Organization: Microware Systems Corp., Santa Clara, CA
Lines: 45

In article <3036@zipeecs.umich.edu=> walden@dip.eecs.umich.edu (Eugene Marvin Walden) writes:
=>
=>   Well, folks, this is part II of my summary of commercial real-time operating
=>systems...
=>
=>25. OS-9, OS-9000
=>
=>    Microware
=>    1900 N.W. 114th St.
=>    Des Moines, Iowa 50322
=>    (515) 224-1929
=>
   - small, ROMable kernel
   - pre-emptive, priority-based round-robin scheduler
   - signals, events (semaphores), pipes/named pipes, data modules
   - full resident or cross development

=>...
=>   The second generation of "real-time" operating systems were the real-time
=>executives that were used for embedded data acquisition & control. These exec-
=>utives typically handle message-passing primitives, simple task scheduling
=>according to priority, semaphores and queues. They are usually fairly small,
=>the main purpose being to provide an interface to a single-board computer. Ex-
=>amples of such real-time operating systems are:
=>...

OS-9 is one of the earliest RT OS's (at least for microprocessor-based
systems) having been first released in 1979 for the 6809.  Because of
its original design as a full-blown operating system rather than a
stripped-down kernal, however, it tends to be quite similar to UNIX,
allowing full resident development in a very UNIX-like environment
rather than requiring cross-development.  Its modular design does allow
for ROM-based systems in the same size and offering similar performance
to the RT kernels. 

=>...
=> Eugene Walden 
=> walden@dip.eecs.umich.edu


-- 
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#  Bill Sheppard -- bill@mwca.microware.com -- {uunet,sun}!mcrware!mwca!bill   #
#  Microware Systems Corporation  ---  OS-9: Seven generations beyond __/_!!   #
#######Opinions expressed are my own, though you'd be wise to adopt them!#######