Re: 6502 core / 128 mode (re: J-Board) (fwd)

From: John (
Date: 2001-03-11 10:43:24

Andre Kaesmacher writes:

>Acorn's ARM-Cpus are also a good Example, of how to enhance a
>6502 without going the "65816-Way".

This is getting a bit off topic, but... where does this claim come from?  I
keep hearing it, and the two processors have nothing in common except maybe
some vague fuzzy "if you liked the 6502, you'll probably find the ARM to
your taste".

The ARM is a classic RISC processor with a couple of twists - the barrel
shifter in the data path before the ALU, and the four bit condition code on
each instruction (all instructions are conditional).  All operations are
register-register.  The only instructions that touch memory are load and
store.  This is clearly quite different to the 6502, in which almost all
instructions touch memory, and you don't have any register-register

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