Subject:
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Re: Speed of RCX interpreting bytecodes: slow
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Wed, 5 Jan 2000 03:38:36 GMT
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Viewed:
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1376 times
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Its been a long time since I looked at the firmware in detail, but is it
possible that the bytecode interpreter is driven from one of the timer
chains? If this was the case, it wouldn't matter if the CPU could execute
the bytecode in 200 cycles...it would still just wait for the next tick
before executing another bytecode.
Dave Baum
In article <Fnu3oH.L7p@lugnet.com>, kekoa@pixel.Stanford.EDU (Kekoa
Proudfoot) wrote:
> Ben Jackson <ben@ben.com> wrote:
> > While working on the barcode scanner I decided to see just how fast the
> > RCX could loop. A simple NQC program can do about 1000 counter loop
> > iterations in about 100 ticks, or 1 iteration/ms. This is shockingly
> > slow. The native H8/329 is clocked at 16Mhz and claims to do simple adds
> > in 2 clocks...
>
> What is in a "counter loop iteration" ? Please share the NQC program you
> used to measure this with us. I fail to believe that a simple loop runs
> this slow. 16000 cycles per loop iteration does not sound right to me.
>
> -Kekoa
--
reply to: dbaum at enteract dot com
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Message has 2 Replies:
 | | Re: Speed of RCX interpreting bytecodes: slow
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| (...) Hmm. If so, an interesting option for a theoretical replacement-but- compatible firmware to have would be the ability to do things as fast as possible. (Of course, it'd have to be an option, since it's possible that some badly-designed code (...) (25 years ago, 5-Jan-00, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: Speed of RCX interpreting bytecodes: slow
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| (...) What is in a "counter loop iteration" ? Please share the NQC program you used to measure this with us. I fail to believe that a simple loop runs this slow. 16000 cycles per loop iteration does not sound right to me. -Kekoa (25 years ago, 4-Jan-00, to lugnet.robotics.rcx)
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