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From: Tony Williams
Subject: Re: Basic Stamp vs Pic processors
Date: Mon, 07 Oct 2002 16:51:15 +0100
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3DA184E7.B1F429F3@webaccess.net>
NNTP-Posting-Date: Mon, 7 Oct 2002 15:54:34 +0000 (UTC)
User-Agent: Pluto/1.14i (RISC-OS/3.60)
In article <3DA184E7.B1F429F3@webaccess.net>,
Chuck Simmons wrote:
>...... A big surprise to me when I wrote Forth for RCA 1802
> was that of all the 8 bit micros I have ever used, it was
> the best Forth machine by miles.
Wasn't it just.... probably no accident that Forth Inc
also used it for one of their earliest target-compilers.
> In writing a Forth for TMS320C20, I have to class it as one
> of the worst because it is a horror at byte and bit manipulation
> and access to program memory is awkward...
The ARM has been my favorite, for years. Writing for
a machine controller (an ATE) based on a desktop computer.
No probs with bit, byte, or 32-bit manipulations.
My simple embedded apps are satisfied by the PIC, but if
I had to do a processor-intensive embedded app it would be
based on one of the ARM-variants, probably with the Forth
target-compiler from Microprocessor Engineering.... highly
optimised code; from the few examples I have seen the
results are as near to assembler as you can get without
actually having to write assembler.
> I consider AVR a possible for Forth execution. It cannot
> have a full functioning Forth because program memory cannot
> be written from a program.
The StrongARM 110 is supposed to be Harvard Architecture,
yet there is successful fully functioning Forth available
> Generally, von Neumann machines with highly "orthogonal" instruction
> sets are good for Forth. For example, the RCA 1802 had a highly
> "orthogonal" instruction set and was a piece of cake for Forth.
6809 was supposed to be ok, and the Super-8 mentioned
> I forgot to mention. The first Forth I ever saw was one
> written by Chuck Moore running on a Data General Nova 820.
Was that the one with a 2uS NEXT, in 1970? Ten years
later I was fiddling about with the 6502 (AIM-65 for any
BoFs with long memories), which still was only capable
then of a 35uS NEXT.
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