Subject:
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Re: Tasks in RCX
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 21 Dec 1999 22:14:14 GMT
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Viewed:
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415 times
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alex wetmore wrote:
> On Tue, 21 Dec 1999, Dennis Clark wrote:
> > In lugnet.robotics, Ram Meenakshisundaram writes:
> > > Hi,
> > >
> > > I read somewhere that the RCX is limited to only 10 concurrent tasks.
> > > Is this limitation in the firmware? If so, can I use a replacement
> > > firmware like legOS to overcome this. I basically want to have an
> > > unlimited number of tasks so that I can port OCCAM-2 to the RCX. Thanks
> >
> > <chuckle> 10 seems like a small number (yes its limited by the firmware)
> > until you try to use them all. In my experience only email and webserver type
> > applications kick off more than 4 or 5 threads at once.
>
> > From some searching it appears that OCCAM-2 is a programming language
> for parallel systems, so having a lot of threads probably is
> desirable. It also seems to me that implementing an existing
> language on the RCX would generally involve new firmware anyway,
> because the RCX firmware has so many limitations. NQC does very
> nicely using the standard firmware, but is missing basic programming
> concepts such as arrays (a firmware limitation).
>
> http://www.hensa.ac.uk/parallel/occam/compilers/spoc/ has an OCCAM-2
> to C compiler, which could perhaps be used with LegOS to get
> something up and running on the RCX. I have to wonder if OCCAM-2
> is really designed to run in the limited memory environment of the
> RCX though.
Sure why not. The transputer parallel CPU was specifically designed to run
OCCAM and it only had 4K of internal RAM compared to the 32K. However, it has
direct machine-level support for the OCCAM constructs. I was actually planning on
using SPOC & legOS to run OCCAM.
Ram
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| Ram Meenakshisundaram
| Senior Software Engineer
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| ( ) Oooo. Email: rmeenaks@olf.com
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Message is in Reply To:
 | | Re: Tasks in RCX
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| (...) From some searching it appears that OCCAM-2 is a programming language for parallel systems, so having a lot of threads probably is desirable. It also seems to me that implementing an existing language on the RCX would generally involve new (...) (25 years ago, 21-Dec-99, to lugnet.robotics)
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