Subject:
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RE: What´s the memory for the RCX?
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 12 Sep 1999 16:59:39 GMT
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Viewed:
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850 times
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> The RCX doesn't actually have a hard-drive or flash memory or even EEPROM.
> It stores its core information in a 16K ROM, which is loaded into a 32K RAM,
> which is cleared out when you remove the batteries. When you download a new
> program or new "firmware," the text (code) and data actually both go into
> RAM only. Check out Kekoa's "RCX Internals" page for extensive hardware
> details. <http://graphics.stanford.edu/~kekoa/rcx/>
Whoops, almost...
There is a 32K ROM which is "masked" into the micro. It is not erasable, or
rewritable. This is the core firmware with all of the hooks to handle timer
interrupts, read sensors, drive the motors and display, and to upload new
firmware.
That leaves the 32K RAM for firmware, which may be the original TLG firmware
that ships with the RCX. It might also be a LegOS image, or a pbFORTH image.
As far as I know these are the only two replacement firmwares out there.
NQC, BotKit, etc are all built on top of the TLG firmware.
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Reply to: rhempel at bmts dot com
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Message is in Reply To:
 | | Re: What´s the memory for the RCX?
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| (...) The RCX doesn't actually have a hard-drive or flash memory or even EEPROM. It stores its core information in a 16K ROM, which is loaded into a 32K RAM, which is cleared out when you remove the batteries. When you download a new program or new (...) (25 years ago, 12-Sep-99, to lugnet.robotics)
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