Subject:
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RCX and Java
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 4 May 1999 19:49:14 GMT
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Original-From:
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Ola Liljedahl <olli@enea.^AntiSpam^se>
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Viewed:
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1181 times
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Aren't robots real time systems?
Isn't the RCX meant to be a component in such real time systems?
Java (as implemented by current virtual machines) is NOT suitable
as a platform for building real time systems. The implementation of
garbage collection is not deterministic and may take a very long
time to execute. You Emacs users out there should recognise the problem...
We should make the distinction between real time systems and embedded
systems. Java is fine for embedded systems with no real time requirements.
In my line of business I see some Java being used in real time systems.
But never for real time purposes, only for low priority (as regards to
real time properties) operation and maintenance.
--
Ola Liljedahl
olli@enea.se
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 3 Replies:
 | | Re: RCX and Java
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| (...) I doubt anyone is considering using the RCX with any OS/language in a hard real-time system. The original firmware nor any of the replacements make the proper guarantees required for such a system (ie, a deadline-based scheduler), and I have (...) (25 years ago, 4-May-99, to lugnet.robotics)
| | | Re: RCX and Java
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| Has anyone thought of porting OS9 to the RCX. OS9 is a multi-processing, multi-tasking, pre-empted OS that can be put into ROM. It is also a 8 bit OS. Uses Pascal, Basic, Assembly, & C for writing code. Level 1 OS9 fits perfectly into 32K of memory (...) (25 years ago, 5-May-99, to lugnet.robotics)
| | | Re: RCX and Java
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| (...) FYI I have been involved in two (big) projects using java for controlling industrial production one is used to control high speed sorting systems the other for controlling packing of newspapers comming directly from the rotation press. And yes (...) (25 years ago, 5-May-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Something else is needed, I think...
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| I say let us go ahead and make this JVM for the RCX. I am in, Any other volunteers? As I have previously announced (in the LegOS) group that I was going to do this one person has already agreed to volunteer. As a side note take a look at: (URL) (...) (25 years ago, 4-May-99, to lugnet.robotics)
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