Subject:
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Re: mindstorms NXT and memory
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 9 Jan 2006 02:10:40 GMT
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Original-From:
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steve <SJBAKER1@AIRMAILnospam.NET>
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Viewed:
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8672 times
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Ignacio Martinez Vazquez wrote:
> > If you are mapping a 30' x 30' room - and (say) you need a byte for
> > every square inch of the floor so you can map the position of chair
> > legs and such
>
> You could use a bit per square inch
You could - but I might want to store more than one bit of information
per square inch (eg a 'confidence' figure or a 'time since last mapped'
number - or to store multiple maps so I can see how the
map is changing over time).
The point is that having such an incredibly small amount of memory
(by modern standards) forces you into ugly compromise solutions from
your shiney new system from day #1.
If this system is going to be around for the same amount of time as
the RCX (what? nearly 10 years now?) - it ought not to look antiquated
from the very beginning.
You can buy Flash memory USB 'thumb drives' for $8.50 in quantity
with anywhere from 128Mbytes upwards. (Check out - for example
www.customflashsolutions.com - but even in one-off quantities,
128Mb flash drives can be bought for $14).
That's ONE THOUSAND TIMES more flash memory than the NXT is claimed
to have.
Dunno about you - but if I'm going to be paying over $250 for a
robotics system, I'd pay the extra $8 to get a thousand times
more memory.
I'm so horrified about this that I'm half convinced that this must
be a mis-print and that the NXT *surely* has 128Mb and not 128Kb.
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Message has 3 Replies:
 | | Re: mindstorms NXT and memory
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| (...) I'm curious - I'm a physicist, not by any means a hardware type. What *is* a standard amount of on-board FLASH for a embedded system? The NXT uses some sort of ARM processor (what the heck does that stand for anyway?) - how FLASH-rish do these (...) (18 years ago, 9-Jan-06, to lugnet.robotics)
| | | Re: mindstorms NXT and memory
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| (...) Yup. For my solution, you need ugly byte operation. Not good for a 10 year old. Still, with these robots you often design the environment to suit your limitations (eg. smaller room) (18 years ago, 9-Jan-06, to lugnet.robotics)
| | | Re: mindstorms NXT and memory
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| (...) Where did the 128Kb number come from? First of all, whether it is standard or not, I like to use a capital "B" to indicate bytes (or spell out byte) and a small 'b' to indicate bits. So, based on the Lego NXT Faq, the NXT brick has 256KB(ytes) (...) (18 years ago, 9-Jan-06, to lugnet.robotics)
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