Subject:
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Re: How much memory finally? ADDENDUM
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 10 Feb 2000 18:28:00 GMT
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Viewed:
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1460 times
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I haven't seen anyone talk about hacking a memory expansion (hardware)
yet.
Dennis
Ralph Hempel wrote:
> Denis wrote:
>
> > Well, I checked with Kekoa's memory map,
> > and indeed, thinks are not as simple.
> > And Dave was right (Why did I doubt is sacred words?)
> >
> > Memory is divided into three main area of 16k.
> > The first is ROM, containing the base programs.
> > The two other sections are SRAM.
>
> There is no user memory from 0x4000 to 0x8000 - It's all ROM space
> but it might not be used.
>
> I look at things in terms of replacement firmware, and the RCX
> is very flexible in this regard.
>
> The RAM for replacement firmware starts at 0x8000. They have some
> user vars at 0xcc00, but the ROM routines let you relocate that.
>
> You can cram all the stuff you want between 0x8000 and 0xEF00, which
> gets you about 28K for user RAM total. The last 4K is memory
> mapped motor drivers and the on-chip RAM for stacks etc.
>
> I'm still looking at how much of the area above 0xF000 is available,
> but since I have not hit the ceiling yet, I'm not too worried.
>
> Hope my 2 cents woth doesn't muddle things up too much...
>
> Cheers,
>
> Ralph Hempel - P.Eng
>
> --------------------------------------------------------
> Check out pbFORTH for LEGO Mindstorms at:
> <http://www.hempeldesigngroup.com/lego/pbFORTH>
> --------------------------------------------------------
> Reply to: rhempel at bmts dot com
> --------------------------------------------------------
--
Dennis Williamson - Certified Y2K Complacent
Bad News: The next millenium starts on a Monday.
Good News: You get the day off.
(remove .NO and SPAM. to reply)
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Message has 1 Reply:
Message is in Reply To:
 | | RE: How much memory finally? ADDENDUM
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| (...) There is no user memory from 0x4000 to 0x8000 - It's all ROM space but it might not be used. I look at things in terms of replacement firmware, and the RCX is very flexible in this regard. The RAM for replacement firmware starts at 0x8000. (...) (25 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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