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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Basic Stamp vs Pic processors
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <3DA184E7.B1F429F3@webaccess.net>
Date: Tue, 08 Oct 2002 00:31:22 GMT
NNTP-Posting-Date: Mon, 07 Oct 2002 17:31:22 PDT
Dave VanHorn wrote:
> I consider AVR a possible for Forth
> > execution. It cannot have a full functioning Forth because program
> > memory cannot be written from a program. It allows simple implementation
> > of additional stacks though the inner interpreter is clumsy.
> The mega series can re-write it's code space.
I wasn't aware that that feature had gotten into standard products. I
know there was interest when my group architected a chip with three AVR
mega 103 cores in which one of them can modify all of the memory on the
chip (there is no flash so I had to come up with a boot loader for
initial testing of the chip). The mega 103 core has no instruction to
write program memory so we made all of our memory dual port and the
"master" AVR sees all of memory (data and program for all three AVRs)
mapped into data space. We did not want the "master" AVR to be able to
modify its program memory all of the time so you have to ground a pin on
the chip to enable the "master" to write its own memory.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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