Subject:
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Re: How much memory finally?
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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 04:10:38 GMT
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Viewed:
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1490 times
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In article <38A18492.997A205C@indiana.edu>, Denis Cousineau
<decousin@indiana.edu> wrote:
> I'm trying to figure out how much memory the RCX has.
>
> Many sources claims that it has
> - 16k rom
> - 16k ram for the firmware
> - 6k reserved for our own programs
>
> Does this mean the RCX has 22k of RAM memory? What an odd number...
I believe it has a 16K ROM and 32K SRAM. Within the 32K, 16K is
occupied by the 'firmware' downloaded to the RCX. About 6K is reserved
for bytecode program space and the datalog.
Presumably the rest is working memory for the firmware (stack, globals,
etc). Much of it has been mapped out.
>
> Also, when I perform MemMap, the final number is
> 26 000 (or so). The end of the firmware is located
> at 20 000 (or so). This is where I don't understand.
>
> Is the firmware 16k or 20k? I know it has to be 16384 bytes
> long, so why Memmap returns 20 000?
I believe the firmware starts at 0x8000 and ends at 0xbfff.
There's lots of good info here:
http://graphics.stanford.edu/~kekoa/rcx
Dave Baum
--
reply to: dbaum at enteract dot com
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Message has 2 Replies:
 | | Re: How much memory finally?
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| Thank for the answer, Dave, this is the kind of info I'm looking for. BUT! I don't think it is correct: 0x8000 is 32k: the firmware would start at the end of memory!?! 0xbfff is 48k: unless the 16k of the rom are counted of course... Then this mean (...) (25 years ago, 10-Feb-00, to lugnet.robotics.rcx)
| | | Re: How much memory finally? ADDENDUM
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| 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 (...) (25 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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Message is in Reply To:
| | How much memory finally?
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| I'm trying to figure out how much memory the RCX has. Many sources claims that it has - 16k rom - 16k ram for the firmware - 6k reserved for our own programs Does this mean the RCX has 22k of RAM memory? What an odd number... Also, when I perform (...) (25 years ago, 9-Feb-00, to lugnet.robotics.rcx)
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