On 2016-02-26 15:23, Gregg Levine wrote:
Hello!
Interesting.
I was only reporting what I remember as to the history of the whole
example we call UNIX.
And last year at the Vintage Computer Festival East, (Yes Dave W, the
same one where we crossed paths.), I saw a PDP-11 system having
finished dumping his program output to a TTY setup. I commented then
that the instructions shown resembled an 6502 one, I was also thinking
of the original 6800, but did not say that, and then it wasn't until I
walked away that I thought of a 68000, but only because I was inspired
by something I had read regarding the history of what was used in the
first Mac or its ancestor. And then continuously until much later when
reason caused Apple to switch to the PowerPC. Let's not discuss the
decision to switch to Intel.
But then you must have looked at some code that was not PDP-11, or else
you are very confused about the 6502, or else you are very confused
about assembler in general.
You are comparing a processor with generic registers, with lots of
addressing modes, and a fully orthogonal instruction set, to a processor
that is accumulator based, have rather limited addressing modes, and
limited combinations of arguments to instructions.
The 6502 have more in common with the PDP-8, I'd say.
Johnny
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