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 22:05:29 GMT
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Original-From:
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alex wetmore <alex@phredIHATESPAM.org>
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Viewed:
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447 times
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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.
alex
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Message has 2 Replies:
 | | RE: Tasks in RCX
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| (...) I guess we have enough new users here that I can start flogging pbForth again.....and I just released a new version that lets you build a kernel on the RCX itself!! That's right, the RCX is the compiler so it works with Macs, PCs, Linux, Sun, (...) (25 years ago, 21-Dec-99, to lugnet.robotics)
| | | Re: Tasks in RCX
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| (...) 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 (...) (25 years ago, 21-Dec-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Tasks in RCX
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| (...) <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. DLC (25 years ago, 21-Dec-99, to lugnet.robotics, lugnet.robotics.rcx)
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